Can a recorder be connected in series to the PLC’s analog circuit?
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For the PLC4-20mA analog circuit, I want to add a recorder; is it possible to connect it directly in series with the circuit? Can all sensors accept a recorder connected in series? I heard that resistance is a factor to consider – some sensors can be used this way while others cannot Please give your advice
Of course, the current signal needs to be connected in series
It is theoretically feasible, but it’s better to add an isolation module for input and output to avoid interference.
You can give it a try; if it doesn’t work, it’s due to an impedance mismatch, in which case add a one-to-two output safety gate
It’s best to use a two-part partition; this makes it more orderly!
It’s mainly hard to buy abroad; is it okay to use it this way? Also, can active analog signals be connected to a recorder in series?
One to two is good; it seems the recorder itself has a point from which it can output again, right?
Used in this way, it’s fine as long as the loop impedance does not exceed a certain value! Active analog? What does it mean? Are you referring to a 2-wire transmitter?
It’s best to use a two-part partition, as this makes things more orderly
Active analog signal, four-wire type; transmitter with its own power supply, no need for 24VDC supply
I don’t think it will work, because recorders generally connect to passive signals; they need to be connected in series within a circuit that provides 24VDC as power for two-wire transmitters. If you try to add a four-wire signal, there is only current and no voltage in the four-wire circuit, and if you connect this to the supply voltage in the two-wire circuit, it definitely won’t work!