ROC364 Instruction Manual
5-3
I/O Converter Card
Rev Jun/05
5.4 Troubleshooting and Repair
The troubleshooting and repair procedures are designed to help identify and replace faulty cards. Faulty
I/O Converter Cards should be returned to your local sales representative for repair or replacement.
First indications of possible I/O Converter Card failure are when:
♦
More than one I/O device fails to operate properly.
♦
The value for diagnostic Analog Input +T (Point Number E1) as read by the configuration
software is less than 22 volts dc.
If the reading is questionable, the voltage may be confirmed by measuring the voltage at terminal “A” of
any Analog Input Loop module.
5.4.1 Replacing an I/O Converter Card
If you are installing an I/O Converter Card for the first time, refer to Section 5.3, Initial Installation and
Setup, on page 5-2. To remove and replace a converter card on an in-service ROC, perform the
following procedure. Be sure to observe the cautions to avoid losing data and damaging equipment.
When repairing units in a hazardous area, change components only in an area known to be non-
hazardous.
There is a possibility of losing the ROC configuration and historical data held in RAM while
performing the following procedure. As a precaution, save the current configuration and
historical data to permanent memory as instructed in Section 2, RAM Backup Procedure
During this procedure, all power is removed from the ROC and devices powered by the ROC.
Ensure all connected input devices, output devices, and processes remain in a safe state when
power is removed from the ROC and when power is restored to the ROC.
1.
Remove power from the ROC.
2.
Remove the FlashPAC.
3.
Remove the screws that hold the MCU upper cover in place, and then lift off the cover.
4.
Remove the three screws securing the I/O Converter Card. Using a rocking motion to disengage
the card from its connector, pull the card free from the MCU board.
5.
To reinstall an I/O Converter Card, orient the card over connector J1 on the MCU board so that
plug P1 will fit into it. Gently press until the connector firmly seats.
6.
Install the three 6-32 retaining screws to secure the card to the MCU board.
7.
Reinstall the MCU cover.
8.
Reinstall the FlashPAC.
9.
Reconnect power to the ROC by plugging in the power terminal block.
10.
Check the configuration data, ROC Displays, and FSTs, and modify them as required.
11.
Verify that the ROC performs as required.