# Patent

## Title
Electromagnetic connector for an industrial control system

## Abstract

An electromagnetic connector is disclosed that is configured to form a first magnetic circuit portion comprising multiple coils disposed about a first core member. The electromagnetic connector is configured to mate with a second electromagnetic connector that is configured to form a second magnetic circuit portion comprising a coil disposed about a second core member. When the electromagnetic connector is mated with the second electromagnetic connector, the first core member and the second core member are configured to couple the multiple coils of the electromagnetic connector to the coil of the second electromagnetic connector with a magnetic circuit formed from the first magnetic circuit portion and the second magnetic circuit portion. The magnetic circuit is configured to induce a signal in a first coil of the multiple coils and the coil of the second electromagnetic connector when a second coil of the multiple coils is energized.

## Background
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application is a continuation under 35 U.S.C. §120 of U.S. patent application Ser. No. 13/959,888, filed Aug. 6, 2013, and titled “ELECTROMAGNETIC CONNECTOR,” which itself is a continuation-in-part under 35 U.S.C. §120 of U.S. patent application Ser. No. 13/875,858, filed May 2, 2013, and titled “Electromagnetic Connectors;” U.S. patent application Ser. No. 13/341,176, filed Dec. 30, 2011, and titled “COMMUNICATIONS CONTROL SYSTEM WITH A SERIAL COMMUNICATIONS INTERFACE AND A PARALLEL COMMUNICATIONS INTERFACE;” U.S. patent application Ser. No. 13/341,161, filed Dec. 30, 2011, and titled “SWITCH FABRIC HAVING A SERIAL COMMUNICATIONS INTERFACE AND A PARALLEL COMMUNICATIONS INTERFACE;” and U.S. patent application Ser. No. 13/341,143, filed Dec. 30, 2011, and titled “ELECTROMAGNETIC CONNECTOR.” U.S. patent application Ser. No. 13/959,888 is also a continuation-in-part of International Application No. PCT/US2012/072056, filed Dec. 28, 2012, and titled, “ELECTROMAGNETIC CONNECTOR AND COMMUNICATIONS/CONTROL SYSTEM/SWITCH FABRIC WITH SERIAL AND PARALLEL COMMUNICATIONS INTERFACES.” U.S. patent application Ser. Nos. 13/959,888; 13/875,858; 13/341,176; 13/341,161; and Ser. No. 13/341,143; and International Application No. PCT/US2012/072056 are herein incorporated by reference in their entireties.


BACKGROUND
Electrical connectors are mechanical assemblies used to complete an electrical circuit or join two or more electrical circuits together. Plug and socket type electrical connectors generally include a male plug and a female receptacle, with multiple pin or prong contacts in the male plug configured for insertion into openings in a mating socket of the female receptacle. Multi-pin connectors employ multiple metal pins. Thus, the connections between mating metal parts (e.g., pins and sockets) must be capable of furnishing good electrical connections to complete the electrical circuits. For example, multi-pin connectors are used as interconnects in Industrial Control Systems (ICS)/Process Control Systems (PCS) to connect Input/Output (I/O) devices to power and/or communications signal transmission circuitry. Such circuitry may be used by, for instance, a power backplane, where multiple electrical connectors are connected in parallel to a common electrical power supply. Other types of electrical connectors include: Eight Positions, Eight Conductors (8P8C) modular connectors used for Ethernet and Category 5 (CATS) cables; D subminiature connectors used for Recommended Standard 232 (RS-232) modem serial ports, computers, telecommunications, test/measurement instruments, monitors, joysticks, mice, and game consoles; Universal Serial Bus (USB) connectors, including Type A, Type B, Mini-A, Mini-B, Micro-A, and Micro-B connectors used for interfacing devices; electrical power connectors, such as Alternating Current (AC) power plugs and sockets (e.g., plugs having protruding prongs, blades, and/or pins that fit into matching slots and/or holes in sockets, receptacles, outlets, power points, and so forth), and Direct Current (DC) connectors, such as coaxial power connectors; as well as Radio Frequency (RF) connectors for transmitting RF signals; and the like.
SUMMARY
In one or more implementations, a device is disclosed that includes multiple electrical circuits and an electromagnetic connector configured to form a first magnetic circuit portion that comprises a first core member and multiple coils disposed about the first core member. Respective ones of the multiple coils are configured to separately connect to a corresponding one of the multiple electrical circuits. The electromagnetic connector is configured to mate with a second electromagnetic connector, where the second electromagnetic connector is configured to form a second magnetic circuit portion that comprises a second core member and a coil disposed about the second core member. When the electromagnetic connector is mated with the second electromagnetic connector, the first core member and the second core member are configured to couple the multiple coils of the electromagnetic connector to the coil of the second electromagnetic connector with a magnetic circuit formed from the first magnetic circuit portion and the second magnetic circuit portion. The magnetic circuit is configured to induce a signal in a first coil of the multiple coils and the coil of the second electromagnetic connector when a second coil of the multiple coils is energized (e.g., in the manner of a passive hub).
This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.



DRAWINGS
The Detailed Description is described with reference to the accompanying figures. The use of the same reference numbers in different instances in the description and the figures may indicate similar or identical items.
FIG. 1 is an isometric view illustrating a connector assembly comprising a first electromagnetic connector mated with a second electromagnetic connector, where the first electromagnetic connector includes first and second coils disposed about a first core member, and the second electromagnetic connector includes another coil disposed about a second core member, and where the first and second electromagnetic connectors form a magnetic circuit configured to induce a signal in the first coil of the first electromagnetic connector and the coil of the second electromagnetic connector when the second coil of the first electromagnetic connector is energized (e.g., in the manner of a passive hub) in accordance with an example embodiment of the present disclosure.
FIG. 2 is a diagrammatic illustration of an electromagnetic connector including multiple coils separately connected to multiple electrical circuits in accordance with an example embodiment of the present disclosure.
FIG. 3 is a partial diagrammatic illustration of a system including multiple communications channels connected together with a passive hub formed using electromagnetic connectors, such as the electromagnetic connector illustrated in FIG. 2, in accordance with an example embodiment of the present disclosure.
FIG. 4 is a partial diagrammatic illustration of a system including electrical circuits fabricated on a printed circuit board, where each one of the electrical circuits is separately connected to an electromagnetic connector supported by the printed circuit board, such as the electromagnetic connector illustrated in FIG. 2, in accordance with example embodiments of the present disclosure.
FIG. 5A is a cross-sectional end view of a system including a module (e.g., an industrial element) configured to couple with a backplane using electromagnetic connectors in accordance with an example embodiment of the present disclosure.
FIG. 5B is a partial cross-sectional end view of the system illustrated in FIG. 5A, where the electromagnetic connectors are mated to couple the module to the backplane.



DETAILED DESCRIPTION
Overview
Multi-pin connectors are typically used in industrial control systems/process control systems to connect I/O devices to power and/or communications signal transmission circuitry included with a power backplane. The pin interconnects provide high precision signal resolution and are often constructed from high quality materials, such as hardened steel with gold plating, and so forth. Care must be taken when connecting and disconnecting multi-pin connectors to avoid bending or misaligning the various pins. Additionally, in both industrial settings and in the field, pin interconnects are often exposed to corrosive materials and contaminants, and may be subject to oxidation and coating, leading to intermittent failures. The nature and cause of the failures may be difficult and costly to determine. Thus, multi-pin connectors are generally a high cost and high maintenance component of industrial control systems hardware.
Industrial control systems/process control systems may also require galvanic isolation between I/O devices and associated power transmission and control equipment. For example, I/O devices typically use transformers and/or optical equipment for signal transmission to electrically isolate the I/O devices, prevent ground loops, and so forth. Industrial systems may provide a backplane for power and/or communications signal transmission, with pluggable I/O devices connected to the backplane. Each pluggable I/O device may use multi-pin connectors for both power and communications transmissions, along with Pulse-Width Modulation (PWM)/Pulse-Duration Modulation (PDM) and a power transformer to achieve isolation between the backplane and the I/O devices. For example, the backplane may use a DC power source and connectors to deliver DC signals to the I/O devices. Each I/O device may then use a PWM to convert the DC signals to AC and a transformer to deliver the power/communications signals to circuitry. The use of the high quality multi-pin connectors, PWM circuitry, and power transformers increases the cost and complexity of the I/O devices.
Accordingly, electromagnetic connector assemblies are described that employ electromagnetic connectors which form portions of a magnetic circuit. One or more of the electromagnetic connectors comprises a core member and multiple coils disposed about the core member. In implementations, the electromagnetic connectors are configured to mate with other electromagnetic connectors so that, when one electromagnetic connector is mated with another electromagnetic connector, the core members of the connectors couple the coils of the first connector to one or more coils of the second connector to complete the magnetic circuit. When one coil of the multiple coils is energized, the magnetic circuit is configured to induce a signal in another coil of the multiple coils and one or more coils of the second connector. Further, when a coil of the second connector is energized, a signal is induced in the multiple coils of the first connector. In this manner, an electromagnetic connector assembly can be used in the manner of a passive hub. Electromagnetic connectors can be used to facilitate communications between, for example, an I/O module and a backplane.
Electromagnetic connectors configured in accordance with the present disclosure need not necessarily require precision contact, pressure, and/or alignment to complete the magnetic circuit linking the tightly coupled coils. In implementations, the electromagnetic connectors can be used in industrial control systems having a power backplane/bus configuration. For example, the electromagnetic connectors can be used with one or more I/O modules in place of the PWM, separate power transformer, and associated transistors that would otherwise be required for each I/O module to maintain isolation between the I/O modules and the power backplane. The electromagnetic connectors can also be used in place of multi-pin connectors for communications and/or power signal transmission. Eliminating multiple PWM's, power transformers, transistors, and multi-pin connectors can provide a significant cost and space savings for this type of configuration, along with increased galvanic isolation between sensor and control components. Further, contactless interconnection for signal transmission can provide more environmentally robust structures, reducing or eliminating field failures due to corrosion, pin misalignment, and so forth.
In one or more implementations, the electromagnetic connector assemblies are employed in a system that includes a backplane for distributing an AC signal. The system can include a number of electromagnetic connectors coupled with the backplane. As described herein, the electromagnetic connectors comprise a core member and one or more coils disposed of the core member (e.g., as previously described). Each one of the electromagnetic connectors is configured to mate with another electromagnetic connector, which can be included within a module. When the electromagnetic connectors are mated, the coils are coupled via a magnetic circuit. The magnetic circuit is configured to induce a signal in one or more coils of the module when a coil of the backplane, or another coil of the module, is energized. Further, when a coil of the module is energized, the magnetic circuit is configured to induce a signal in one or more coils of the backplane. The backplane can be used to power and/or furnish communications with circuitry of the module.
The system can be configured for an industrial control system/process control system having a multidrop power backplane/bus configuration that transmits high frequency AC power using DC-to-AC (DC/AC) conversion circuitry and distributed transformers, with electromagnetic connectors configured as previously described. A system configured in accordance with the present disclosure can eliminate the use of a separate PWM for each I/O device, replacing multiple PWMs with, for example, a single PWM located on the backplane. Thus, a typical connector and power transformer configuration can be replaced with magnetic circuits (e.g., tightly coupled transformers). Each magnetic circuit can be configured as two portions (e.g., halves) of a transformer, where one portion (e.g., half) of the transformer is located in each module, and the other portion (e.g., half) is located in the backplane. The portion of the transformer in the backplane can comprise, for example, the primary coil and a portion of the core. The portion of the transformer in each module can comprise the secondary coil and a mating core. Electrical power in the primary coil is extracted by the secondary coil, and can then be rectified and used to power and/or communicate with circuitry in each module.
A system configured in accordance with the present disclosure can be implemented as a communications control system that includes a switch fabric having a serial communications interface (e.g., a serial or Multidrop Bus (MDB) with a master and multiple slaves) and a parallel communications interface (e.g., a parallel or point-to-point bus implemented using a cross switch, or the like). The serial communications interface and the parallel communications interface can be used for connecting multiple Input/Output (I/O) modules to communications/control modules, and to one another.
Example Implementations
FIGS. 1 through 5 illustrate example electromagnetic connectors 100 of connector assemblies 102 in accordance with example implementations of the present disclosure. The electromagnetic connectors 100 can be used in any application where it is desirable to couple electrical circuits together for transmitting electrical signals and/or electrical power from one circuit to another, while maintaining isolation between the circuits. For instance, the electromagnetic connectors 100 can be used in applications including, but not necessarily limited to: industrial control systems/process control systems (e.g., to connect I/O devices with power and/or communications signal transmission circuitry), telecommunications (e.g., for audio, broadband, video, and/or voice transmission), information/data communications (e.g., for connecting computer networking equipment, such as Ethernet equipment, modems, and so forth), computer hardware interconnection (e.g., for connecting peripherals, such as joysticks, keyboards, mice, monitors, and so on), game consoles, test/measurement instruments, electrical power connectors (e.g., for power transmission from AC mains), and the like.
Each one of the electromagnetic connectors 100 is configured to form a magnetic circuit portion 104, which includes a core member 106 and one or more coils 108 disposed about (e.g., around and/or within) the core member 106. For the purposes of the present disclosure, it should be noted that “core member” is used to refer to an incomplete part of a magnetic core, which is completed by another core member when the electromagnetic connectors 100 are coupled together. Each electromagnetic connector 100 is configured to mate with another electromagnetic connector 100 of a connector assembly 102 for transmitting power and/or communications signals between components that are connected via the electromagnetic connectors 100. For example, a first I-shaped or E-shaped core member 106 of an electromagnetic connector 100 is configured to mate with a second I-shaped or E-shaped core member 106 of another electromagnetic connector 100 to transmit communications signals between the first electromagnetic connector 100 and the second electromagnetic connector 100.
In implementations where one core member 106 is configured to contact another core member 106, the contact surfaces may be substantially flat, but this configuration is provided by way of example only and is not meant to limit the present disclosure. Thus, other implementations may be provided, including implementations designed to increase the surface area of contact between core members and/or to provide self-alignment of the core members (e.g., by configuring a portion of one core member for insertion into another core member). For example, one core member comprises a tapered pin configured for insertion into a tapered hole of another core member, where the outside periphery and/or an end of the tapered pin is configured to contact a portion of the interior wall and/or a bottom surface of the tapered hole. In some embodiments, electromagnetic connectors 100 furnish an interference fit configuration, e.g., where one or more coils 108 are disposed around a first core member 106, and one or more other coils 108 are disposed within a second core member 106. The interference fit can be established using connectors having geometries including, but not necessarily limited to: conical, concentric, eccentric, geometric, sloped for friction fit, and so forth.
In embodiments of the disclosure, the first core member 106 is not necessarily configured to contact the second core member 106 when the first electromagnetic connector 100 is mated with the second electromagnetic connector 100. One or more gaps may be provided between various points of a particular pair of mating core members 106. For example, as illustrated in FIG. 1, in an embodiment with two I-shaped core members 106, an air gap AG is provided between the first I-shaped core member 106 and the second I-shaped core member 106. For example, a first core member 106 is supported proximal to, but not necessarily in electrical contact with, a second core member 106. Further, an air gap AG may be provided by mating an E-shaped core member 106 with a C-shaped core member, a U-shaped core member, an I-shaped core member, and so forth. For example, the middle leg of one E-shaped core member can be configured to extend through both a first circuit board with a first coil comprising a planar winding, and a second circuit board with second coil comprising a planar winding, where the outer legs of the E-shaped core member are configured to contact the legs of another U-shaped core member. In this configuration, the coil disposed of the U-shaped core member can be positioned between the legs of the “U.” However, planar windings are provided by way of example only and are not meant to be restrictive of the present disclosure. Thus, a coil 108 may comprise other windings, such as insulated copper windings wrapped around or within a core member 106, and so forth.
It should be noted that while the core members 106 are shown as I-shaped and E-shaped in the accompanying figures, these shapes are provided by way of example only and are not meant to limit the present disclosure. Thus, a core member 106 and/or the combined form of two mating core members 106 may comprise other shapes and/or core geometries, including but not necessarily limited to: a “C”/“U” core, an “EFD” core, an “EP” core, an “ER” core, a pot core, a toroidal core, a ring/bead core, and so forth. For example, the shape of a core member 106 may be selected based upon a coupling/operating frequency. Further, a core member 106 can be implemented as a planar core (e.g., with a planar winding). In implementations, the core member 106 may be formed in or on a circuit board, e.g., along with a coil 108 formed as a planar winding, such that the core member 106 is electrically insulated from the coil 108 by one or more portions of the circuit board.
One or more core members 106 of the electromagnetic connectors 100 can be formed from an iron slurry material. However, this material is provided by way of example only and is not meant to limit the present disclosure. Thus, a core member 106 may comprise any material having a magnetic permeability suitable for confining and guiding magnetic fields generated by a coil 108, including, but not necessarily limited to: soft magnetic materials (i.e., magnetic materials with low hysteresis, such as silicon steel), ferromagnetic metals (e.g., iron), ferrimagnetic compounds (e.g., ferrites), and so forth.
One or more coils 108 of the first electromagnetic connector 100 can be tightly coupled to one or more coils 108 of the second electromagnetic connector 100 with a magnetic circuit formed from the magnetic circuit portion 104 of the first electromagnetic connector 100 and the magnetic circuit portion 104 of the second electromagnetic connector 100. The magnetic circuit is configured to induce a signal in one or more of the coils 108 of the first electromagnetic connector 100 when one or more of the coils 108 of the second electromagnetic connector 100 is energized, and to induce a signal in one or more of the coils 108 of the second electromagnetic connector 100 when one or more of the coils 108 of the first electromagnetic connector 100 is energized, allowing power and/or communications signals to be transmitted between components that are connected via the electromagnetic connectors 100. In implementations, the coils 108 can be tightly coupled (e.g., using an iron core to provide a coupling coefficient of about one (1)), critically coupled (e.g., where energy transfer in the passband is optimal), or overcoupled (e.g., where a secondary coil is close enough to a primary coil to collapse the primary coil's field).
In implementations, one or both of the core members 106 and/or coils 108 can be at least partially (e.g., fully or partially) mechanically encased within one or more layers of material. Further, in some embodiments, one or more layers of material (e.g., a protective layer 110) are disposed of the first core member 106 for separating the first core member 106 from the second core member 106 when the first electromagnetic connector 100 is mated with the second electromagnetic connector 100. The protective layer 110 can be fabricated of a non-conductive/insulating material, such as a coating of thin film plastic material. The protective layer (e.g., non-conductive/insulating material) can be applied using techniques including, but not necessarily limited to: coating, painting, deposition, and so forth. In some embodiments, the protective layer 110 comprises a layer of five one-thousandths inch (0.005 in.) thick Lexan. In embodiments of the disclosure, the protective layer 110 is configured to protect the core member 106 and/or the coil 108 of the electromagnetic connector 100 from corrosion, mechanical damage (e.g., fracture), and so forth. Encasement may be especially useful when a core member 106 is constructed from a brittle material. For instance, the core member 106 can be tightly encased in a protective layer formed of a plastic material. In this manner, when damage to the core member (e.g., cracks or breaks in the core member) occurs, the pieces of material can be maintained in substantial contact with one another within the casing. Thus, damage to the core material may not significantly decrease performance.
FIGS. 2 through 5 illustrate systems 112 in accordance with example implementations of the present disclosure that are configured for use with process control systems technology, and so forth. For example, a system 112 is illustrated that may be used with a distributed control system comprised of controller elements and subsystems, where the subsystems are controlled by one or more controllers distributed throughout the system. The system 112 can include a switch fabric comprising a serial communications interface and/or a parallel communications interface for furnishing communications between one or more backplanes 114 and one or more modules 116. Each backplane 114 has a number of electromagnetic connectors 100, where each one of the electromagnetic connectors 100 includes a core member 106 and one or more coils 108 disposed of the core member 106 (e.g., as previously described). Each one of the electromagnetic connectors 100 included with a backplane 114 is configured to mate with another electromagnetic connector 100 included with a module 116, such as an industrial element, and so forth. For example, the system 112 can be implemented with electromagnetic connector 100 interconnects in an Industrial Control System (ICS)/Process Control System (PCS) to connect I/O devices to power and/or communications signal transmission circuitry.
When the electromagnetic connectors 100 are mated, a core member 106 of the backplane 114 and a core member 106 of a module 116 are configured to couple the coils 108 via the magnetic circuit. The magnetic circuit is configured to induce a signal in one or more coils 108 of the module 116 when a coil 108 of backplane 114 is energized (e.g., with an AC signal from a DC/AC converter). The signal induced in coils 108 of the module 116 can be used to power and/or furnish communications with one or more electrical circuits 118, as shown in FIG. 2. It should be noted that while the backplane 114 is described as inducing a signal in the module 116, this implementation is provided by way of example only and is not meant to be restrictive of the present disclosure. Thus, the magnetic circuit can also be used to induce a signal in one or more coils 108 of the backplane 114 when a coil 108 of module 116 is energized to furnish communications with backplane 114. Further, the coils 108 included with mating electromagnetic connectors 100 can be energized in an alternating sequence (e.g., one after another) to provide bidirectional communication, and so forth.
In embodiments of the disclosure, the module 116 and/or the backplane 114 includes multiple electrical circuits 118, where two or more of the electrical circuits 118 each separately connect to a coil 108 disposed about a core member 106 of an electromagnetic connector 100. In this manner, communications between the backplane 114 and one or more modules 116 can be implemented in the manner of a passive hub 120. For example, the backplane 114 and the module 116 can communicate using multiple communications channels 122, each of which can be implemented using, for instance, a controller 124 (e.g., a microcontroller), as shown in FIG. 3. When a coil 108 disposed in the backplane 114 is energized, a signal is induced in each coil 108 associated with each communications channel 122 of the module 116. Further, when a coil 108 disposed in the module 116 is energized, a signal is induced in one or more coils 108 associated with the backplane 114. In this manner, communication is furnished between multiple controllers 124. In embodiments of the disclosure, two or more of the electrical circuits 118 are at least substantially identical (e.g., identical, electrically equivalent, and so forth) to provide redundancy within the backplane 114 and/or a module 116.
In some implementations, the electrical circuits 118 are implemented in a single, monolithic printed circuit board (PCB) 126, e.g., with multiple I-shaped and/or E-shaped core members 106 and coils 108 of electromagnetic connectors 100 supported by the PCB 126, as shown in FIG. 4. In implementations, the core members can be mechanically isolated from the PCB 126 (e.g., not touching the PCB 126). However, this configuration is provided by way of example only and is not meant to be restrictive of the present disclosure. In some embodiments, one or more biasing members 128 (e.g., a spring) are included for biasing a core member 106, as shown in FIG. 5B. For example, in the illustrated embodiment, a core member 106 is biased towards another core member 106. However, in other embodiments, a core member 106 is biased away from another core member 106, biased into alignment with another core member 106, and so forth.
The system 112 can be configured for connecting one or more I/O modules 116 (e.g., as slave devices) and transmitting data to and from the I/O modules 116. The I/O modules 116 can comprise input modules, output modules, and/or input and output modules. For instance, input modules can be used to receive information from input instruments in the process or the field, while output modules can be used to transmit instructions to output instruments in the field. For example, an I/O module 116 can be connected to a process sensor, such as a sensor for measuring pressure in piping for a gas plant, a refinery, and so forth. In implementations, the I/O modules 116 can be used to collect data and control systems in applications including, but not necessarily limited to: industrial processes, such as manufacturing, production, power generation, fabrication, and refining; infrastructure processes, such as water treatment and distribution, wastewater collection and treatment, oil and gas pipelines, electrical power transmission and distribution, wind farms, and large communication systems; facility processes for buildings, airports, ships, and space stations (e.g., to monitor and control Heating, Ventilation, and Air Conditioning (HVAC) equipment and energy consumption); large campus industrial process plants, such as oil and gas, refining, chemical, pharmaceutical, food and beverage, water and wastewater, pulp and paper, utility power, mining, metals; and/or critical infrastructures.
In implementations, the I/O module 116 can be configured to convert analog data received from the sensor to digital data (e.g., using Analog-to-Digital Converter (ADC) circuitry, and so forth). An I/O module 116 can also be connected to a motor and configured to control one or more operating characteristics of the motor, such as motor speed, motor torque, and so forth. Further, the I/O module 116 can be configured to convert digital data to analog data for transmission to the motor (e.g., using Digital-to-Analog (DAC) circuitry, and so forth). In implementations, one or more of the I/O modules 116 can comprise a communications module configured for communicating via a communications sub-bus, such as an Ethernet bus, an H1 field bus, a Process Field Bus (PROFIBUS), a Highway Addressable Remote Transducer (HART) bus, a Modbus, and so forth. Further, two or more of the I/O modules 116 can be used to provide fault tolerant and redundant connections for a communications sub-bus.
Each I/O module 116 can be provided with a unique identifier (ID) for distinguishing one I/O module 116 from another I/O module 116. In implementations, an I/O module 116 can be identified by its ID when it is connected to the system 112. Multiple I/O modules 116 can be used with the system 112 to provide redundancy. For example, two or more I/O modules 116 can be connected to a sensor and/or a motor. Each I/O module 116 can include one or more ports 130 furnishing a physical connection to hardware and circuitry included with the I/O module 116, such as the PCB 126, and so forth.
One or more of the I/O modules 116 can include an interface for connecting to other networks, including but not necessarily limited to: a wide-area cellular telephone network, such as a 3G cellular network, a 4G cellular network, or a Global System for Mobile communications (GSM) network; a wireless computer communications network, such as a Wi-Fi network (e.g., a Wireless LAN (WLAN) operated using IEEE 802.11 network standards); a Personal Area Network (PAN) (e.g., a Wireless PAN (WPAN) operated using IEEE 802.15 network standards); a Wide Area Network (WAN); an intranet; an extranet; an internet; the Internet; and so on. Further, one or more of the I/O modules 116 can include a connection for connecting an I/O module 116 to a computer bus, and so forth.
Data transmitted by the system 112 can be packetized, i.e., discrete portions of the data can be converted into data packets comprising the data portions along with network control information, and so forth. The system 112 can use one or more protocols for data transmission, including a bit-oriented synchronous data link layer protocol such as High-Level Data Link Control (HDLC). In a specific instance, the system 112 can implement HDLC according to an International Organization for Standardization (ISO) 13239 standard, or the like. Further, two or more systems 112 can be used to implement redundant HDLC. However, it should be noted that HDLC is provided by way of example only and is not meant to be restrictive of the present disclosure. Thus, the system 112 can use other various communications protocols in accordance with the present disclosure.
Referring now to FIGS. 5A and 5B, the backplane 114 and the module 116 include two (2) E-core connector assemblies 102 and three (3) I-core connector assemblies 102. The E-core connector assemblies 102 are substantially identical, where one serves as a primary source of power for the module 116 and the other serves as a backup source of power for the module 116. With reference to the three I-core connector assemblies 102, one provides high-frequency communication from the backplane 114 to the module 116, one provides high-speed communication from the module 116 to the backplane 114, and one provides relatively lower frequency bidirectional communication for monitoring and/or supervisory functions. As shown, each I-core electromagnetic connector 100 disposed in a module 116 has five (5) windings, with one (1) winding included with an I-core electromagnetic connector 100 disposed in the backplane 114. The I-core electromagnetic connectors 100 form connector assemblies 102 comprising multi-winding transformers with impedances balanced between the various loads. However, the use of two electromagnetic power transfer assemblies and three electromagnetic communication assemblies is provided by way of example only and is not meant to limit the present disclosure. In other embodiments, fewer or more such assemblies are provided.
Conclusion
Although the subject matter has been described in language specific to structural features and/or process operations, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

## Claims

1. An electromagnetic connector configured to form a first magnetic circuit portion of a passive hub, the electromagnetic connector comprising:
a first core member including at least one of a magnetic material, a ferromagnetic material, or a ferrimagnetic material; and
a coil disposed about the first core member, the coil configured to connect to an electrical circuit, the electromagnetic connector configured to mate with a second electromagnetic connector, the second electromagnetic connector configured to form a second magnetic circuit portion, the second electromagnetic connector comprising a second core member and a plurality of coils disposed about the second core member, the first core member and the second core member configured to couple the plurality of coils to the coil with a magnetic circuit formed from the first magnetic circuit portion and the second magnetic circuit portion when the electromagnetic connector is mated with the second electromagnetic connector, the magnetic circuit configured to induce a communications signal in a first coil of the plurality of coils and the coil when a second coil of the plurality of coils is energized.

2. The electromagnetic connector as recited in claim 1, wherein the electrical circuit is fabricated on a printed circuit board.

3. The electromagnetic connector as recited in claim 2, wherein the printed circuit board is configured to support the first core member and the coil.

4. The electromagnetic connector as recited in claim 1, further comprising at least one layer of material disposed of the first core member for separating the first core member from the second core member when the electromagnetic connector is mated with the second electromagnetic connector.

5. The electromagnetic connector as recited in claim 1, wherein the first core member comprises an I-shaped core member.

6. The electromagnetic connector as recited in claim 5, wherein the I-shaped core member is configured to mate with a second I-shaped core member.

7. A device comprising:
an electrical circuit; and
an electromagnetic connector configured to form a first magnetic circuit portion of a passive hub, the electromagnetic connector comprising a first core member and a coil disposed about the first core member, the first core member including at least one of a magnetic material, a ferromagnetic material, or a ferrimagnetic material, the coil configured to connect to the electrical circuit, the electromagnetic connector configured to mate with a second electromagnetic connector, the second electromagnetic connector configured to form a second magnetic circuit portion, the second electromagnetic connector comprising a second core member and a plurality of coils disposed about the second core member, the first core member and the second core member configured to couple the plurality of coils to the coil with a magnetic circuit formed from the first magnetic circuit portion and the second magnetic circuit portion when the electromagnetic connector is mated with the second electromagnetic connector, the magnetic circuit configured to induce a communications signal in a first coil of the plurality of coils and the coil when a second coil of the plurality of coils is energized.

8. The device as recited in claim 7, further comprising a printed circuit board, wherein the electrical circuit is fabricated on the printed circuit board.

9. The device as recited in claim 8, wherein the printed circuit board is configured to support the first core member and the coil.

10. The device as recited in claim 7, further comprising at least one layer of material disposed of at least one of the first core member or the second core member for separating the first core member from the second core member when the first electromagnetic connector is mated with the second electromagnetic connector.

11. The device as recited in claim 7, wherein at least one of the first core member or the second core member comprises an I-shaped core member.

12. The device as recited in claim 11, wherein at least the other one of the at least one of the first core member or the second core member comprises a second I-shaped core member configured to mate with the I-shaped core member.

13. An industrial control system comprising:
an industrial element comprising a plurality of electrical circuits and a first electromagnetic connector configured to form a first magnetic circuit portion, the first electromagnetic connector comprising a first core member and at least one coil disposed about the first core member, the at least one coil configured to connect to an electrical circuit;
a backplane comprising a second electromagnetic connector, the second electromagnetic connector configured to form a second magnetic circuit portion, the second electromagnetic connector comprising a second core member and at least one coil disposed about the second core member; and
a passive hub formed by mating the first electromagnetic connector with the second electromagnetic connector, the first core member and the second core member configured to couple the at least one coil of the industrial element to the at least one coil of the backplane with a magnetic circuit formed from the first magnetic circuit portion and the second magnetic circuit portion when the first electromagnetic connector is mated with the second electromagnetic connector, at least one of the at least one coil of the industrial element or the at least one coil of the backplane comprising a second coil, the magnetic circuit configured to induce a signal in the at least one coil of the industrial element and the at least one coil of the backplane when the second coil is energized.

14. The industrial control system as recited in claim 13, further comprising a printed circuit board, wherein the electrical circuit is fabricated on the printed circuit board.

15. The industrial control system as recited in claim 14, wherein the printed circuit board is configured to support the first core member and the at least one coil of the industrial element.

16. The industrial control system as recited in claim 13, further comprising at least one layer of material disposed of at least one of the first core member or the second core member for separating the first core member from the second core member when the first electromagnetic connector is mated with the second electromagnetic connector.

17. The industrial control system as recited in claim 13, wherein at least one of the first core member or the second core member comprises an I-shaped core member.

18. The industrial control system as recited in claim 17, wherein at least the other one of the at least one of the first core member or the second core member comprises a second I-shaped core member configured to mate with the I-shaped core member.