Patent ID: 8963749
Filing Date: 2015-02-24
Classification: G05B,H03M

Abstract:
1. A fieldbus adaptor comprising: a first connection unit configured to be detachably connected to a first field device and a second field device, the first and second field devices being analog-type field devices, a second connection unit directly connected to a third field device conforming to a fieldbus protocol of a FOUNDATION fieldbus (a FF standard specification), the second connection unit being configured to be detachably connected to a fieldbus that is at least one of an FF H1 bus and an HSE bus conforming to the FF standard specification; a protocol stack conforming to at least one of the FF H1 bus and the HSE bus corresponding to the fieldbus; a Virtual Field Device (VFD) object conforming to the FF standard specification, the VFD object including an AI block and an AO block that are function blocks conforming to the FF standard specification; an analog/digital conversion unit provided between the first connection unit and the second connection unit, the analog/digital conversion unit bidirectionally converting a digital signal handled by the fieldbus to an analog signal handled by the first and second field devices and bidirectionally converting the analog signal handled by the first and second field devices to the digital signal handled by the fieldbus, wherein the analog/digital conversion unit is configured to read a Primary Value (PV) of the first field device, which is the analogue signal, and to convert the PV into a digital value, the AI block is configured to receive the digital value, which has been converted, and to output digital data, which is a first calculation result in the AI block, to the fieldbus via the protocol stack, the AO block is configured to receive the digital data, which has been output to the fieldbus from other field devices including the third field device or a manipulation monitoring apparatus, via the protocol stack and to output digital data which is a second calculation result in the AO block, the analog/digital conversion unit is configured to receive the digital data which is the second calculation result, to convert the digital data into an analogue value, and to output the analogue value to the first field device, and the analog/digital conversion unit is operative to communicate with and support field devices conforming to different ones of a plurality of standards.