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c. At the transmitter, activate Select.
d. Scroll to and select Off.
e. Verify the signal at the receiving device.
f. At the transmitter, activate Select.
Postrequisites
• If the mA output reading at the receiving device was slightly inaccurate, you can
correct this discrepancy by trimming the output.
• If the mA output reading at the receiving device was significantly inaccurate, or if at
any step the reading was faulty, verify the wiring between the transmitter and the
remote device, and try again.
• If the discrete output reading is reversed, check the setting of Discrete Output Polarity.
10.12.3 Perform loop tests using ProLink II
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.
ProLink II must be running and must be connected to the transmitter.
Procedure
1. Test the mA output(s).
a. Choose ProLink > Test > Fix Milliamp 1 or ProLink > Test > Fix Milliamp 2.
b. Enter 4 mA in Set Output To.
c. Click Fix mA.
d. 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.
e. Click UnFix mA.
f. Enter 20 mA in Set Output To.
g. Click Fix mA.
h. Read the mA current at the receiving device and compare it to the transmitter
output.
Troubleshooting
Configuration and Use Manual 197