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d. Set the remote input device to OFF.
e. Choose ProLink > Test > Read Discrete Input.
f. Verify the signal at the transmitter.
5. Test the mA input.
a. Set the remote input device to generate a known fixed current.
b. Choose ProLink > Test > Read MA Input.
c. Return the remote input device to normal operation.
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 mA input reading was slightly off at the transmitter, calibrate the mA signal at
the remote input device.
• If the discrete output reading is reversed, check the setting of Discrete Output Polarity.
• If the discrete input reading is reversed, check the setting of Discrete Input Polarity.
10.12.3
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
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. Choose Service Tools > Simulate > Simulate Outputs > mA Output Loop Test and select 4
mA.
c. 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.
d. Press OK.
e. Select 20 mA.
Troubleshooting
178 Micro Motion
®
9739 MVD Transmitters