Mitsubishi Electronics AJ65SBT-64AD User Manual download pdf (Page 60)

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MELSEC-A

6 TROUBLESHOOTING

The details of the errors which may occur when using the AJ65SBT-64AD and

troubleshooting are described.

6.1 Using the Remote Input Signals to Check Errors

In the AJ65SBT-64AD, occurrence of a write error turns on any of the following remote

input signals.

Device No. Signal Name Description

RXn4 CH.1 range error flag

RXn5 CH.2 range error flag

RXn6 CH.3 range error flag

RXn7 CH.4 range error flag

Turns on when the value set for input range setting is outside the setting

range.

Turns on if all channels are not set to any of "user range settings 1 to 3" at

offset/gain setting (in the test mode).

RXnC

PROM write error flag

Turns on if value write failed due to excess of the E

PROM write count over

its limit at the time of offset/gain setting.

If this flag has turned on, this module itself has failed (hardware fault) and

therefore this flag cannot be reset (turned off) by the error reset request flag.

RX(n+1)A Error status flag

Turns on when CH.

range error flag (RXn4 to RXn7) or E

PROM write

error flag (RXnC) has turned on.

This flag can be reset (turned off) by turning on the error reset request flag.

However, for the E

PROM write error which cannot be reset, this flag cannot

be reset, either.

(1) For the input range setting error (RXn4 to RXn7), the "RUN" LED flickers at

intervals of 0.1s and A/D conversion is not performed on all channels.

(2) For the E

PROM write error (RXnC), power on the AJ65SBT-64AD again.

If the E

PROM write error (RXnC) turns on after power is switched on again, it

indicates a hardware fault. Contact your nearest Mitsubishi representative.

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Mitsubishi Electronics AJ65SBT-64AD User Manual Page 60