3-wire PT100 with direct two-channel output
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There are no modules that can handle two outputs simultaneously; currently, one connection is required to the PLC and another to the DCS. Is it possible to use two transmitters or connect them in series to achieve two output channels?
A temperature transmitter with two output channels can be selected.
It’s just that there’s no option to handle two tasks at once, that’s why I’m asking everyone
Yes, there are many isolation gates with one input and two outputs: one Pt100 input, and two 4-20mA outputs
If there is no one-to-two isolation barrier, choose a dual-temperature core. Additionally, you can use the 2-wire system for DCS and the 4-wire system for PLC, and connect them together to see if both can detect something. I haven’t tried it yet; I’m not sure if it will damage the components. Go ahead and give it a try, and let me know if it works
Either choose a two-output model, use an integrated 1-to-2 transmitter, or use a 1-to-2 signal distributor after the signal is sent to the cabinet.
If the temperature transmitter outputs a 4-20MA current signal, a DCS and a PLC can be used in series; the downside is that no signal will be generated in either device if there is an open circuit.
1. Buy a separate barrier with one input and two outputs; it has PT100 inputs and 2 channels of 4–20mA output. The downside is that if the PT100 fails, there will be no signal in either of the two systems. 2. It uses two-core PT100 signals; the downside is that an additional cable is required
On-site, either two thermometers or temperature transmitters are used, or a 1-to-2 signal distributor is employed after the signals are sent to the cabinet.