DCS and SIS communication
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The SIS communicates with the DCS, and the DCS issues intermittent (irregular) alarms, while the SIS does not emit any alarms. Now it is necessary to scan the communication; I am not sure how to do this, nor what software and equipment are required. Currently, I have USB-to-485 and USB-to-HART converters available
Is the signal source SIS or DCS, or does the signal go into the SIS and then communicate to the DCS?
Advanced SIS, then communicate to DCS
Are you starting to use it now, or has it been used for a long time before this issue appeared?
It can be viewed using MODEBUS communication: https://blog.csdn.net/byxdaz/article/details/77979114
Check in DCS whether the communication between channels (cards) is normal; it should be part of the hardware inspection items