Are there experts familiar with the Allen-Bradley K-series hardware? I have a question I’d like to ask
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Is it possible to connect DI cards of the K series, such as K-DI03, to a DI terminal on a single-core wire? Finally, use a single common COM wire to connect to the power supply; this is common in Siemens PLCs. Can this connection be achieved via external or internal power distribution at DI03? It never works, thanks to everyone!
For the DI of a single-core wire, as long as you ensure that a circuit is formed between the power supply and the DI terminal, it’s fine. In practical field applications, we usually connect the COM terminals together; pay attention to the 24V wiring method for the base, as the wiring for internal power supply and external power supply is different
Providing power is sufficient; if there are 5 signals on-site, in theory 6 wires are needed on the DCS side – one wire for power supply, with the on-site loop serving as the power supply terminal. But why those few missing cables? It’s bad if there’s a problem with the wire that supplies power; the risks are high and it’s difficult to identify them.
External power supply refers to the different 24V connection methods at the wiring terminals of the card; the hardware manual provides detailed instructions on these connections
Here are the pictures of the manual taken on a smartphone, showing the wiring for internal and external power supply
It contains the complete set of user manuals for the K-series hardware; download it if you need it
Personally, I’m not in favor of using a common COM line just to save a few wires; what if there’s a problem with that common line? Wouldn’t that affect a large area?