Configure a 7740 to read a 4-20ma input

Issue

Can a 7740 read 4 to 20 milliamp input?

Product Line

TAC I/NET

Environment

I/NET site

Cause

Some sensors will only output a 4-20ma signal and the controller must be able to read it in order to display the sensor values.

Resolution

Although the controller is calibrated to read 1 to 5 volts, a voltage sensing resistor can be added to read 4 to 20 milliamps. Refer to TCON 092 for details.