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Analog Output Mode (HART Communication Disabled)
If you have an unused HART channel, you can use it as a 4-20mA current sinking analog output.
In FBxConnect, you must Disable the 250 Ohm Termination Resistor and set the HART Comm
Mode to Disabled.
Figure 5
an externally powered current loop receiver connects to Channel 1 and a 24VDC loop supply-
powered current loop receiver connects to Channel 4.
Figure 5. Methods for Connecting 4mA to 20mA Analog Outputs to 3HRT04 Channel (No HART communications)
1
4-20mA Analog Signal Loop
2
Transducer
3
Driver
4
Power Supply
5
Actuator
6
3HSTG4 Module internal ground connections (for information only; not visible to user)
7
External Power Source
shows two examples for wiring a HART channel as a 4-20mA analog output. In the figure,
FB3000 RTU HART
®
I/O Module Field Installation Guide
D301918X012
June 2021
9