Need Help with 4 to 20 Signal Reading on 1734-IE4C

[LuisGonzalez 0]

Hello everyone,

I'm currently facing an issue with a 4 to 20 signal reading on a 1734-IE4C, particularly with a 3-wire sensor (Seametric, S-Series). I've checked the sensor manual and noticed the following key points:

1. The sensor power on the PLC is 5 - 24 VDC.

2. The sensor power supply can provide at least 2 mA (100 mA is typical.)

3. The sensor input on the PLC can accept a current-sinking device.

This is my first experience with the 1734-IE4C, and while going through the manual, I couldn't find specific information about whether it accepts sinking devices.

Additionally, I'm using the same power supply to energize both the sensor and the PLC.

If anyone has experience with this module or any suggestions on how to troubleshoot an under-range alarm on the PLC, your insights would be greatly appreciated.

Thank you in advance!

sseries.pdf

1734-in032_-en-p.pdf

[pturmel 160]

The installation diagram is pretty clear that the four channels share a pair of connected common terminals.  The channels are not isolated from each other, and the signal terminal must be positive, and the input must be the last device on the loop (internally completed by a precision resistor to common).

Also, do you have a diagram for the AO55 that is required for 4-20mA operation?

Edited 29 Nov 2023 by pturmel