Talk about this picture
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Talking about this diagram, 1. Is the DI circuit isolated by an optocoupler? With such a DI card, isn’t it unnecessary to use a relay for isolation? 2. How does the query voltage in the circuit work? 3. How do the capacitors and inductors in the circuit function? 4. Can this DO circuit output a passive signal?
DI is opto-isolated; there is no need to measure voltage in the circuit. The capacitor is used to eliminate high-frequency interference signals. That is a resistor, not an inductor, and it serves to limit current flow. DO provides an output voltage of 48V/24V
Thank you. There is one more question: the detection voltage in the DI circuit does not operate based on the principle of R=U/I. I wonder how it’s detected?
Is the principle of DCS’s DI the same as that of PLC’s DI?
After comparing, it seems the principle is the same. It’s the same except for the additional features.
You might say that printed circuit boards are more or less similar, but if you look at them in detail, there are definitely differences
This should be the schematic diagram of a DI module from some manufacturer. Understanding its principle allows for quick problem-solving at work.
1.Is the DI circuit optocoupled? With such a DI card, isn’t it unnecessary to use a relay for isolation? Opto-isolation, that’s right. It is best to isolate the DI card with a relay. 4. Can this DO circuit output a passive signal? If the 24V supply at the contacts is not connected, the output will be passive; in the diagram, the output is 24V.
MARK it, I’ll answer tomorrow