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103 v01000004 Intrinsically Safe Capable Physical Layer | Electrical Connector | Power Supply
103 v01000004 Intrinsically Safe Capable Physical Layer
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102_v03000003_Physical_Layer
CiA 103
I n tr i n s i c a l l y s a f e c a p ab le p h y s i c a l l a y er
Version: 1.0.0 05 February 2010
! CAN in Automation (CiA) e. V.
0 as draft standard proposal Publication of Version 1. either expressed or implied. including.org 2 ! CiA 2010 – All rights reserved .org Email: headquarters@can-cia.Intrinsically safe capable physical layer – HISTORY Date 2007-03-23 2010-02-05 Changes Publication of Version 1. Unless otherwise specified.0 as draft standard General information on licensing and patents CAN in AUTOMATION (CiA) calls attention to the possibility that some of the elements of this CiA specification may be subject of patent rights. electronic or mechanical. V. there is no warranty for this specification. to the extent permitted by applicable law. no part of this publication may be reproduced or utilized in any form or by any means. TM © CiA 2010 All rights reserved. Germany Tel. Because this specification is licensed free of charge.90429 Nuremberg. but not limited to. NeSSI is a unregistered trademark of Center for Process Analytical Technology (CPAC) at the University of Washington. without permission in writing from CiA at the address below. Seattle (USA). Should this specification prove failures. Trademarks CANopen® and CiA® are registered community trademarks of CAN in Automation. CiA shall not be responsible for identifying any or all such patent rights. More detailed terms for the use are available from CiA. you assume the cost of all necessary servicing. repair or correction. the implied warranties of merchantability and fitness for a particular purpose. The entire risk as to the correctness and completeness of the specification is with you. including photocopying and microfilm. Except when otherwise stated in writing the copyright holder and/or other parties provide this specification “as is” without warranty of any kind. The use is restricted for CiA members or owners of CANopen vendor ID.: +49-911-928819-0 Fax: +49-911-928819-79 Url: www.can-cia. Kontumazgarten 3 DE . CAN in Automation e.
............................4 Electrical characteristics of data signals ....... 7 System aspects...............................2 International standards ...........................5..................5 4 5 6 Introduction ......2 Definitions .................................................1 Introduction ................................ 6 4........................................2 Cable electrical specifications............1 Introduction .. 13 ! CiA 2010 – All rights reserved 3 ...............................................................................................................3 Dynamic attach and detach....................................... 7 5........ 13 A....... 7 IS system parameters .............. 5 3...........5 Bit timing .................................................................................................................................................................................................................................... 10 6...........................................................5.................................................................................................... 7 6.................................5......................... 4 Abbreviations and definitions . 4 References ......................................................... 7 5................................................................1 6............................................................................................................5................................................................................. 13 A........................................................................................................................1 Calculations ................6 Isolation requirements ....................................... 7 5........................2 6............... 11 6.................................................................3 6............................................................................................................ 10 6.... 9 Physical specification ..............5................................. 12 6......................................4 6................................................................................................... 8 Transmission medium parameters ................ 5 System architecture .....................................2 Communication physical layer .... 6 4............................................................................................................................ 12 6................................................................................................... 9 Bus topologies ...... 5 3....................................................................................................................................................1 Introduction ...................................... 6 4............... 12 Annex A Appendix (Informative only) ................2 Associated apparatus entity parameters ...................................................................................................................................................................................... 10 6..............................1 Abbreviations................................................................................................................................... 6 Intrinsically safe aspects .........................................3 Power bus ...........Intrinsically safe capable physical layer – CONTENTS 1 2 3 Scope .........3 IS apparatus entity parameter......5............
It may also be used for other CAN-based higher-layer protocols. This document does not attempt to list the requirements by which an item of equipment may be certified as intrinsically safe nor does it require equipment to be intrinsically safe. It does restrict other implementations from implementing their own selections. 1. NOTE The wire medium specification provides the option of intrinsically safe power via the bus conductors. This specification addresses a recommended application for implementing an intrinsically safe capable communication and power system.01. zones 0.Intrinsically safe capable physical layer – 1 Scope This specification describes an intrinsically safe capable physical layer application for CANopen. Electrical apparatus for explosive gas atmospheres – Part 0: UL 60079. Intrinsically Safe Apparatus and Associated Apparatus for Use in Class I.or snap-locking for low voltage applications EN 50020. CANopen application layer and communication profile CiA 303. Many parameters are selected by the developers to provide a baseline for calculation. Division 1 Hazardous (Classified) Locations /UL60079-0/ /UL60079-11/ UL 60079. &2 Hazardous (classified) locations – Intrinsic Safety /ISO11898-1/: /ISO11898-2/ /IEC60079-11/ /IEC61076-2/ /EN50020/ /CiA301/ /CiA303-1/ /CSA/ /ANSI120201/ /UL913/FM3610/ ANSI/ UL913. Rather. Electrical apparatus for use in class I. Electrical apparatus for explosive gas atmospheres – Part 11: Intrinsic Safety ! CiA 2010 – All rights reserved 4 . Intrinsically safe and Non-Incendive equipment for use in hazardous locations – Consumer and commercial products ANSI/ISA 12.2 No. Intrinsic safety CiA 301. Connectors for electronic equipment – Part 2: Detailed specification for circular connectors M8 with screw. Road vehicles – Controller area network (CAN) – Part 1: Data link layer and physical signaling ISO 11898. Information technology – Open Systems Interconnection – Part 1: Basic reference model: The basic model ISO 11898.02. 157. II and III. it seeks to exclude conditions or situations that would prevent IS certification. Electrical apparatus for potentially explosive atmospheres. Road vehicles – Controller area network (CAN) – Part 2: Highspeed medium access unit IEC 60079. Electrical apparatus for explosive gas atmospheres – Part 11: Intrinsic safety IEC 61076. CANopen additional specification – Part 1: Cabling and connector pin assignment CSA C22. 2 References /ISO7498-1/ ISO 7498.
and /CiA301/ apply for this specification as well.Intrinsically safe capable physical layer – 3 Abbreviations and definitions 3. which limits current and voltage into a hazardous area in order to satisfy intrinsic safety requirements Circuit Complete path for electric current including the generating apparatus.2 Definitions The definitions given in /ISO7498-1/. /ISO11898-2/. 3.und Regeltechnik New Sampling/Sensor Initiative Polyethylene Polyvinylchloride Telecommunications Industry Association Abbreviations given in /CiA301/ and /ISO11898-1/ apply for this specification as well. Barrier Physical entity. wires and load devices Intrinsic Safety Design methodology for a circuit or an assembly of circuits in which any spark or thermal effect produced under normal operating and specified fault conditions is not capable under prescribed test conditions of causing ignition of a given explosive atmosphere NOTE This definition is taken from EN 50020 (Intrinsically safe electrical apparatus). /ISO11898-1/. ! CiA 2010 – All rights reserved 5 .1 Abbreviations AWG DC IEC IS ISO ECU EIA EMI GND MAU NAMUR NeSSI PE PVC TIA TM American wire gauge Direct current International electrotechnical commission Intrinsically safe International organization for standardization Electronic control unit Electronic Industries Alliance Electro magnetic interferences Ground Medium Access Unit Normenarbeitsgmeinschaft für Mess.
This means that both the power and communication lines are transmitted through a common gateway device to an intrinsically safe environment as shown in Figure 1. Typically available power supplies provide four pairs of separate power lines. In intrinsically safe applications.Intrinsically safe capable physical layer – Segment Sum of nodes on a communication network NOTE Nodes on a common segment may be on a different circuit. Figure 1 – System architecture 4. This gateway device shall provide the correct power and galvanic isolation requirements for an intrinsically safe system. 4 System architecture 4. available power may limit the number of devices. This allows the system to set up four separately IS powered cocabled bus trunk circuits. 4. 6 ! CiA 2010 – All rights reserved . This specification is compliant with the CAN high-speed physical layer specifications as defined in /ISO11898-2 /. The power supply availability has driven this design.1 Introduction The system architecture of this design incorporates “co-cabling”.2 Communication physical layer The communication model is described in /ISO11898-1/ and /CiA301/. The 10-m cable length is driven by this selection. Other power options may be considered in the future.3 Power bus The power bus specification is derived from commercially available power systems.
the gateway device is an associated apparatus.5 9.0 Groups IIC IIB IIA C i n [ ! F] 0. Table 1 specifies the entity parameters of one channel. capacitance. The voltage.2 Associated apparatus entity parameters An associated apparatus in an intrinsically safe environment has component in both the IS and non-IS fields as illustrated in Figure 3. 6 System aspects 6. IIB. All devices. Figure 2 illustrates the generic IS architecture. while the devices within the IS field are called IS apparatus.3 IS apparatus entity parameter The total V max and I max shall be less that the parameters for the associated apparatus.2). The entity concept allows interconnection of intrinsically safe apparatus with associated apparatus to be combined as a system when the approved values of I sc and V oc are less than or equal to the V max and I max of the IS apparatus and the approved values of C o and L o of the associated apparatus are greater than C i +C cable and L i + Lcable respectively for the IS apparatus and cable must be less than values of C 0 and L 0 of the associated.0 1.4 L i n [ ! H] 10 40 80 The groups IIA.5 9.IS apparatus entity parameters V m ax [V] 9. Table 1 . and IIC are references to different types of gases as defined in /EN50020/.0 1.Intrinsically safe capable physical layer – 5 Intrinsically safe aspects 5.1 Introduction In IS terminology. 5. This system is designed to work within Zone 1 and Division 1 (see A.8 2.5 NOTE I m ax [A] 1. current. which are indicated in Figure 3 as IS CAN ! CiA 2010 – All rights reserved 7 .1 Introduction This clause provides physical layer definitions for the different components for an IS system topology as illustrated in Figure 3. Figure 2 – IS architecture 5. These parameters are dictated by the IS Zone where the devices are placed. The system allows the usage of up to four channels. and inductance delivered on the power bus by the apparatus are called entity parameters.4 6.
Table 2 – IS system parameters Operating parameter VIN II N PIN CIN LI N t Bit n Input operating voltage Input operating current Power consumption Input capacitance to ground (any pin) Input inductance to ground (any pin) Nominal bit time Number of nodes Min 1 2. The maximum DC load current shall be obtained from Table 2.5V 125 kbit/s default - 8 ! CiA 2010 – All rights reserved . All of the CAN devices are shown on the same segment and use a common bit rate.63 V DC .Intrinsically safe capable physical layer – devices are IS apparatus.5 20 Typ 8. The recommended DC voltage at the ECU shall be a nominal 8. The ECU shall be able to operate with voltages as low as 7. The gateway is both.5 1000 9 0.63 Max 9.2 IS system parameters The IS system parameters are defined in Table 2. Figure 3 – IS CAN system topology 6. Devices that are not on the same co-cable are considered to be on separate circuits. Devices that are co-cabled are on the same circuit.71 V DC . an associated apparatus and an IS apparatus. The power supply is an associated apparatus.47 500 8 64 SI unit V mA W !F !H !s Comments 10% regulation @ 9.
inrush/power-on and characteristics shall be manufacturer specific. The location of a termination resistor shall not be within an ECU since the bus lines loose termination in case such an ECU is disconnected from the bus. Table 3 – Physical medium parameters for CAN transceivers Operating parameters I I Vs Recessive state current Dominant state current Supply voltage High bus input impedance with low Vcc Min 3. The bus line shall be terminated at both ends with the characteristic impedance of the line to prevent signal reflections. ! CiA 2010 – All rights reserved 9 . Comments - Monotonic outputs during Power cycling - - - - 6. The MAU of the IS CAN device shall be compliant to the definitions given in /ISO11898-2/.67 10 5 m m exactly 5 pins compatibility ISO 11898-2 high-speed CAN electrical specifications Note: The power consumption as well as the parameters passive minimum.4 Bus topologies The physical medium shall be a differentially driven twisted pair cable. active minimum. 6.Intrinsically safe capable physical layer – L L Cable length Sub-length M8 connector 5 1.3 Max 6 6 3.3 Transmission medium parameters Table 3 specifies the physical medium parameters for CAN transceivers used in IS systems.6 SI unit mA mA V No load A high bus input impedance prevents an unpowered device from sinking all bus current and halting communication. Figure 4 illustrates a typical CAN bus topology.0 Typ 3. The ECUs shall be connected to the bus line by means of unterminated stub-lines. A device bus output shall not toggle during power up or power down to prevent false data entering the bus. active maximum.
6. The DC loss is typically 26.5. the signal requirements.3 Characteristic impedance of the communication line The characteristic impedance of the cable shall be 120 " .5. 6.2.5 Physical specification 6. and isolation requirements.Intrinsically safe capable physical layer – Figure 4 – CAN bus topology 6. 10 ! CiA 2010 – All rights reserved . Overall outer jacket shall be light blue in colour.5. 6.1 Cable electrical specifications Introduction This section provides specifications for cabling to be considered in IS systems.1 Introduction This section defines the recommended cable and connectors.2.2.2 6.5 " typically DC loss resistance and PVC jacket.5 " (resp.2 Cable type For power and communication lines this specification recommends 24AWG cables with 26.2.5.092 " /m). a thicker cable may be used. 0. 6.5.5. As long as the entity parameters are considered.4 Cable loss The signal attenuation shall be 24dB/100m or less over the range of from 1 MHz up to 16 MHz for the AC property. ± 10% in the frequency range from DC up to 500 kHz.
5.2 Voltage spikes A device shall not generate voltages exceeding 150% of the power supply voltage in case of being attached/detached to/from a powered IS system. The ground connection shall provide a “make-first/break-last” function. 6.3.3 Recommended connectors According to Table 2 the connector used on the ECUs is the 5-pin M8 (“Pico” style) connector as illustrated in Figure 5.2. but they shall be keyed to insure against reverse polarity. A device shall not be damaged by input voltages up to 150% of the power supply voltage for periods up to 100 µ s.5.3 6. 6.Intrinsically safe capable physical layer – 6.5. The device shall provide the plug connector.5 Propagation delay The maximum 5 ns/m propagation delay specification given in /ISO11898-2/ apply for this specification as well.5. Unplugging an ECU shall only stop any communication between the disconnected ECU and those remaining on the network.3. Figure 5 – Pinning for the M8 connector plug connector Table 4 – Definition of the pinning for the M8 Pico style connector Pin 1 Signal (CAN_V+) Description Optional CAN external positive supply (dedicated for supply of transceivers and optocoupler. The connector shall use the pinning as shown in Table 4. ! CiA 2010 – All rights reserved 11 . 6.5.1 Dynamic attach and detach Introduction The act of plugging or unplugging an ECU to/from the system shall not affect the functionality of other devices connected to the system.3. if galvanic isolation of the bus node applies) Optional CAN shield CAN_H bus line (dominant high) CAN_L bus line (dominant low) Ground / 0V / V- 2 3 4 5 (CAN_SHLD) CAN_H CAN_L CAN_GND For this application other connectors may be selected.
4 Electrical characteristics of data signals The definitions provided in /ISO11898-2/ apply for this specification as well.2.5. Optionally further bit rates.5. shall apply for this document as well. 6. 12 ! CiA 2010 – All rights reserved .5.Intrinsically safe capable physical layer – 6.5 Bit timing The bit timing defined in /CiA301/ shall apply for this specification as well.6 Isolation requirements The isolation requirements of the IS standards referenced in Annex A. An ECU shall support the bit rate 125 kbit/s. may be supported. 6. which are specified in /CiA301/.
then: V Otyp = 9. actual voltage delivered to the device could be: VDEV min = 8.1 Calculations In calculating the viability of this implementation.87 " 1 A * 0.87 " = 0.2 Zone method Table 5 provides references to the relevant standards for zone method.2.7 V Since this system is expected to work with NAMUR spec valves.1 This clause provides the international standards that define zones resp.6 V For a 10 m @ 24 AWG.1. They are as follows: I Omax = 1 A V Omax = 9. & 2 1&2 Relevant standard in certain country/area Europe EN 50020 Canada IEC 60079-11 USA UL 60079-11 & -0 A. In addition specifications for wiring and general requirements are listed. ! CiA 2010 – All rights reserved 13 .2. (Single Fault) Zone 0. 1. A. divisions and the related entity parameters. (Dual Fault) Ex ib.2 International standards General A. resistance 0.1. Table 5 – Standards for zone method Protection method Ex ia. which have to be considered in the given countries or regions. this voltage level is acceptable.9 V = 7.0 V.2.1. V Omin = 8.9 V Therefore.3 Division method Table 6 provides references to the relevant standards for division method. calculations were made regarding the worstcase power supply with the selected cable length.6 V – 0.Intrinsically safe capable physical layer – Annex A Appendix (Informative only) A. A.5 V If 5% variation is probable.
5 Wiring practice specifications Table 8 provides wiring practice specifications. which provide general requirements for devices in hazardous areas to be considered in the given country or region. & 2 Relevant standard in certain country/area Canada CSA C22.06.01-2002 (IEC 60079-0 Mod) Country or region Canada International USA A.4 General requirements for devices in hazardous areas Table 7 provides specifications.00. 2012. A.01-1995 (R2002) Country or region Canada International USA USA 14 ! CiA 2010 – All rights reserved .2 No. ANSI/NFPA 70.2.1. Table 8 – Wiring practice specifications Document CSA C22. to be considered in the given country or region. Table 7 – General requirements for devices in hazardous areas Document CAN/CSA-E60079-0-02 (R2006): IEC 60079-0 ANSI/ISA-12.1.2. New devices should comply with UL 913 edition 7.Intrinsically safe capable physical layer – Table 6 – Standards for division method Protection method Intrinsic safety (Dual Fault only) Division 1. articles 504 and 505 ANSI/ISA RP12.1 IEC 60364 NEC 2005. 157 USA UL913/ FM3610 NOTE IS devices certified under UL 913 edition 6 remain effective until July 31.
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