10.4.3 Perform loop tests using the Field Communicator
A loop test is a way to verify that the transmitter and the remote device are
communicating properly. A loop test also helps you know whether you need to trim mA
outputs.
Prerequisites
Before performing a loop test, configure the channels for the transmitter inputs and
outputs that will be used in your application.
Follow appropriate procedures to ensure that loop testing will not interfere with existing
measurement and control loops.
Procedure
1. Test the mA output(s).
a. Choose Service Tools > Simulate > Simulate Outputs > mA Output 1 Loop Test or Service
Tools > Maintenance > Simulate Outputs > mA Output 2 Loop Test, and select 4 mA.
b. Read the mA current at the receiving device and compare it to the transmitter
output.
The readings do not need to match exactly. If the values are slightly different,
you can correct the discrepancy by trimming the output.
c. Press OK.
d. Select 20 mA.
e. Read the mA current at the receiving device and compare it to the transmitter
output.
The readings do not need to match exactly. If the values are slightly different,
you can correct the discrepancy by trimming the output.
f. Press OK.
g. Choose End.
2. Test the discrete output(s).
a. Press Service Tools > Simulate > Simulate Outputs > Discrete Output Test.
b. Choose Off.
c. Verify the signal at the receiving device.
d. Press OK.
e. Choose On.
f. Verify the signal at the receiving device.
g. Press OK.
h. Choose End.
3. Test the TPS output.
Troubleshooting
Configuration and Use Manual 141
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