What’s going on with this DI signal? I can’t understand it
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All the feedback wires coming from the right-side site have been disconnected (terminals 1 and 2), and the feedback fuses have also been removed; yet the feedback signal remains active (as I measured it at the card reader end). Only when terminal 2 is disconnected does the feedback signal stop flowing! ! Why is there a problem with this? ?
I have encountered such things before. It’s possible that, to save time, the installer privately changed 2 sets of wires (4 wires in total) to 3 wires; the result is the same, with just one wire being unnecessary. It just happens to be the one you pulled the fuse from.
Look carefully. The line on the left has a group that is all common ground. They are all tied together with red thread. Then use Line 1 to connect to the system. So only the even line numbers work.
All the odd-numbered lines on the right side are useless lines. It can be taken apart. The parts that were supposed to connect must have broken off at the site.
The component for the left-side wiring system,,,, the odd-numbered terminals on the left are connected in parallel to the 24V positive terminal. Do you mean that there are four wires for feedback activation and feedback switching on the right side, along with a ground connection?
The parts that were supposed to connect must have broken off at the site. ……………What does this sentence mean?
Just now I asked that the ± feedback circuits are separate sets of wires; so if I disconnect the wire for the positive feedback, then it doesn’t matter whether the field instrument is connected to ground or not, right? ?
This issue has nothing to do with public areas. First of all, your feedback signal is related to whether there are two restrictions; please correct the mistake mentioned above – the public safety limit is 24+, and those with circuit breakers also have a value of 24+. You need to first check whether it’s under voltage, and then determine whether the circuit is connected or not