DI channel issues in the GE SIS system
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I have a question. Our company is currently using the GE SIS system. The day before yesterday, an issue arose: the feedback signals for opening and closing a valve each occupied one DI channel. The status display for the valve’s state was normal – green when it was open, red when it was closed, and gray when there was no signal. When this problem occurred, for the two signal lines related to the opening feedback, one of those lines was removed at the channel location on the card; yet the status color remained unchanged； Remove the other wire, and the status changes; I don’t know why Under normal circumstances, with the two signal lines used for sending responses, the status will change whichever of those signal lines is disconnected. I’m not sure why Please give me some advice
The position of the card; one has been removed, leaving only one. After removing one, the status remains unchanged
Apply some insulation; there seems to be a problem with the wire
A wire was removed directly from the terminal board of the card, leaving only one wire