Rockwell-automation 1771-IR , D17716.5.76 RTD INPUT MODULE Uživatelský manuál stáhnout pdf (Strana 43)

Troubleshooting

Chapter 8

82

Table 8.A shows LED indications and probable causes and recommended

actions to correct common faults.

Table 8.A

Troubleshooting

Chart for the RTD Input Module (1771-IR/B)

Indication Probable Cause Recommended Action

Both LEDs are OFF No power to module

Possible short on the module

LED driver failure

Check power to I/O chassis. Recycle as necessary.

Replace module.

Red FLT LED ON and

Green RUN LED is ON

Microprocessor, oscillator or EPROM failure Replace module.

Red FLT LED ON If immediately after power-up, indicates RAM or

EPROM failure.

Replace module.

If during operation, indicates possible

microprocessor or backplane interface failure.

Replace module.

Green RUN LED is flashing Power-up diagnostics successfully completed. Normal operation.

If LED continues to flash, and write block transfers

(BTW) cannot be accomplished, you have a

possible interface failure.

Check ladder logic program. If correct, replace module.

When red LED is on, the watchdog timer has timed out and backplane communications are terminated. Your user program should monitor

communication.

Status Reported in Words 1 and 2

Design your program to monitor status bits in words 1 and 2, and to take

appropriate action depending on your application requirements. You may also

want to monitor these bits while troubleshooting with your industrial terminal.

The module sets a bit (1) to indicate it has detected one or more of the following

conditions.

Table 8.B

Status

Reported in W

ords 1 and 2

Word Bit Indication

1 00-05 Data underrange. Bit 05 corresponds to channel 6, bit 04 corresponds

to channel 5, and so on. If input connections and resistances are

correct, this status may indicate failed communications between the

channel and microprocessor. If all channels are underrange, a blown

fuse or failed dc-dc converter may be the cause.

06 Successful power-up and module is waiting for configuration data. Bit

06 is reset after the first successful block transfer write.

07 EEPROM calibration constants could not be read. The module will

continue to operate but readings may be inaccurate.

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 67 68

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