Is the wiring of PLC-200 EM231 correct?
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Points: HaiChuan Honored Member, UID832268; Wealth: 1032 points; Reading rights: 90. Registration date: 2013-3-18; Last login: 2013-12-31; Online time: 268 hours. Professional instruments; Elevator access to floors. Posted by the original poster on 2013-12-29 at 19:33 | View only this author’s posts | View in reverse order | Disable reply notifications | (By myself) – Dear Hai friends: I would like to transmit temperature data to both the PLC and the DCS. Previously, at this temperature, it passed through a temperature module (without power distribution) and was connected only to the PLC-200 EM231 (with power distribution at the EM231 terminals). I need to use a safety barrier with one input and two outputs. Remove A-previous. Connect the one-input two-output power distribution safety barrier directly. Am I doing this right? Hope Haiyou can help. Thank you IMG_20131228_085728725.jpg (1.89 MB, downloads: 1) Uploaded on 2013-12-29 19:33 Click the file name to download the attachment
I don’t quite understand it; I’m waiting for an expert to explain it
In the diagram shown by the original poster, the temperature wiring corresponds to a two-wire transmitter module that requires an external power supply; as shown in the diagram, after adding a safety barrier in between, the power supply for the field transmitter module comes from the safety barrier. Meanwhile, the output of the safety barrier is an active 4-20mA signal (some safety barriers provide both active and passive outputs). The active 4-20mA signal can be connected directly to A+ (which must be shorted to RA+) and A-. There are two types of current signals shown in the diagram: one is the four-wire active 4-20mA signal, and the other is the 4-20mA signal that requires an external power supply