4-3
Device Software Functions
DIAGNOSTICS
AND SERVICE
Analog Output Test
The analog output test allows you to drive the transmitter output to a
desired electrical current output on terminals 7 and 8. This capability
allows you to check the entire current loop prior to start-up. On the LOI
the test will end after five minutes if the transmitter is not returned to
normal operation manually.
Pulse Output Test
The pulse output test allows you to drive the frequency output at
terminals 5 and 6 to a desired value. This capability allows you to check
auxiliary equipment prior to start-up. On the LOI the test will end after
five minutes if the transmitter is not returned to normal
operation manually.
Self Test
The transmitter test initiates a series of diagnostic tests that are not
performed continuously during normal operation. It performs the
following tests:
•Display Test
•RAM Test
•PROM Test
During the entire test, all outputs are driven to full-scale – 20 mA and
1,000 Hz. The test requires about ten seconds to complete.
D/A Trim and
(4–20 mA Output Trim)
For maximum accuracy, the analog output should be calibrated and, if
necessary, trimmed for your system loop. The output trim procedure
alters the conversion of the digital signal into an analog
4–20 mA output.
Use the following steps to complete the Output Trim function.
1. Set the loop to manual, if necessary.
2. Connect a precision ammeter to the 4–20 mA loop.
3. Initiate the Output Trim function with the LOI or HART
Communicator.
4. Enter the 4 mA meter value when prompted to do so.
5. Enter the 20 mA meter value when prompted to do so.
6. Return the loop to automatic control, if necessary.
The 4–20 mA trim is now completed. You may repeat the 4–20 mA trim
to check the results, or use the analog output test.
HART Fast Keys 1, 1, 3
LOI Key Aux. Function
HART Fast Keys 1, 2, 3
LOI Key Aux. Function
HART Fast Keys 1, 2, 1, 2
LOI Key Aux. Function
HART Fast Keys 1, 2, 4, 1
LOI Key Aux. Function
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