Valve position switch signal of the SIS valve
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According to HG/T 22820-2024 Code for Design of Chemical Process Safety Instrumentation Systems, Section 7.4.6: Valve position limit switches are generally used for remote indication of the valve position in the control room. This purpose does not fall under safety instrument functions; the valve position indication can be handled by the basic process control system, and a timeout alarm should be set for valve operation. If the valve position switch signal of the SIS valve is not used for interlock purposes but only for displaying the valve status, can it be fed directly into the DCS system rather than the SIS system?
That’s the case, but there are other requirements set forth in the regulations for some aspects. Just as specified in GB17681-2004 for storage units: 6.3.1.5” The switch status signals of the remotely controlled valve switches should be transmitted to the control room for display; the system shall have the capability to determine whether the switch status is correct or not, and it shall issue an alarm in case of an incorrect status. “
It can be set up on the DCS and communicate with the SIS.
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It is recommended to integrate it into the SIS system, so that when there is a discrepancy between the valve actuation signal and the position feedback signal, an effective alarm can be generated to alert the operators；