Emerson ROC364 Manuál s instrukcemi Strana 16

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ROC364 Instruction Manual
6-12 Rev 5/00
6.5.2 Analog Output Channels
The Analog Output channel is used for current loop devices. Use the following procedure to check
current loop installations.
Equipment Required: Multimeter
Personal Computer running ROCLINK Software
1.
Taking appropriate precautions, disconnect the field wiring going to the AO channel terminations.
2.
Connect a multimeter between the B and C terminals of the channel and set the multimeter to
measure current in milliamps.
3.
Using the ROCLINK software, put the AO point associated with the channel under test in Manual
mode (scanning disabled).
4.
Set the output to the high EU value.
5.
Verify a 20-milliamp reading on the multimeter.
6.
Calibrate the analog output high EU value as needed by increasing or decreasing the “Adj D/A
100% Units”.
7.
Set the output to the low EU value.
8.
Verify a 4-milliamp reading on the multimeter.
9.
Calibrate the analog output low EU value by increasing or decreasing the “Adj D/A 0% Units” as
needed.
10.
Enable scanning for the AO point, remove the test equipment, and reconnect the field device.
11.
If possible, verify the correct operation of the AO channel by setting the high and low EU values as
before (scanning disabled) and observing the field device.
6.5.3 Discrete Input Channels
Equipment Required: Jumper wire
Place a jumper across terminals B and C. The LED associated with the channel (located on top left of
I/O Card) should light and the status as read by the ROCLINK software should change to “1”. With no
jumper on terminals B and C, the LED should not be lit and the status should be “0”.
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