Emerson ROC364 Manual de Instruções descarregar pdf (Página 14)

ROC364 Instruction Manual

6-10 Rev 5/00

6.5 TROUBLESHOOTING AND REPAIR

If multiple I/O channels do not appear to be working, check the STATUS LED on the ROC364 I/O

Card. This LED should be blinking slowly (cycles about 2 seconds long) to indicate normal

communications with the MCU. If it stays off, check for power to the I/O Card. If power is okay, then

the I/O communications is bad due to a problem with the connection to the card, the card itself, or the

MCU. If the MCU appears to be normal, unplug the I/O Card, check the connector, and plug it in

again. If the STATUS is still bad, replace the I/O Card.

In general, to troubleshoot an I/O channel, first check to see how the channel is configured using the

ROCLINK Configuration Software. If the configuration looks correct, then simulate an input (within

the range of the input) or force an output to be produced by using ROCLINK. If an input channel is in

question, you may be able to use one of the outputs on the I/O Card (known to be in working order) to

simulate the needed input. Likewise, if an output channel is in question, you may able to connect it to a

working input channel and check the results.

There are no field repair or replacement parts available for the I/O Card. If the card appears to be

faulty, return it to your Fisher Representative for repair or replacement.

If an I/O point does not function correctly, first determine if the problem is with the field device or the

I/O Card as follows:

CAUTION

Failure to exercise proper electrostatic discharge precautions (such as wearing a

grounded wrist strap) may reset the processor or damage electronic components,

resulting in interrupted operations.

Isolate the field device from the ROC by disconnecting it at the I/O terminal block.

Connect the ROC to a computer running the ROCLINK configuration software.

Perform the appropriate test procedure described in the following paragraphs.

A channel suspected of being faulty should be checked for a short circuit between its input or output

terminals and the ground screw on the termination card. If a terminal not directly connected to ground

reads zero (0) when measured with an ohmmeter, the channel is defective and must be replaced.

NOTE

In the following procedures, references to Terminal B mean the second (middle)

position of the terminal wiring block and references to Terminal C mean the third

(counting left to right) position.

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Emerson ROC364 Manual de Instruções Página 14