Yokogawa DI Card ADV151-P
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Dear experts, I would like to know how this card determines whether a connection exists or not; it would be great if you could provide a circuit diagram. Today I checked a valve position switch, and no matter whether I shorted it or disconnected it, the card showed no reaction
Do these card assemblies 17A and 17B operate on 24V power, while 18A and 18B are NC? What does that mean?
NC refers to a normally closed contact, a common designation for relays
Short-circuit at the far end of the card; this will rule out wiring problems. Try it again
17A and 17B are powered by 24V; it could be the coil of a relay or it could supply power to a circuit – the exact purpose depends on the diagram. 18A and 18B are the normally closed contacts of the relay
When asking questions, be as specific and detailed as possible, especially regarding the model number; otherwise, it will be difficult for others to answer you. Generally, ADV151 is equipped with terminal blocks AED5D and ARM15A; it is necessary to confirm that the 24VDC power supply is functioning properly, and also check whether the fuses on the terminal blocks have blown