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Automatic control function programming manual ladder language

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18.2.2.1 PLC Status<br />

The «PLC STATUS» field gives information on the CPU status.<br />

The comments that can be displayed in this area are detailed in the table below:<br />

PLC «RUNNING» Status<br />

Messages Comment<br />

No error PLC <strong>function</strong> operating correctly<br />

Bad I/O bus implementation Cause:<br />

Unidentified card present<br />

Card missing<br />

Discrepancy between programmed configuration and real<br />

configuration<br />

Watchdog <strong>programming</strong> error<br />

Corrective action<br />

Check the input/output configuration (see Sec. 18.2.5)<br />

Check the state of %R97F.B (see Sec. 3.8.5)<br />

Check %INI in the user programme (card and watchdog<br />

configuration variables)<br />

Erroneous I/O bus behaviour Cause:<br />

Link error on the bus<br />

Corrective action<br />

Check the state of bus status signal %Rrc39.B<br />

(see Sec. 3.7.3)<br />

Check the continuity of the fibre-optic ring<br />

Contact NUM CUSTOMER SERVICE<br />

PLC «HALTED» Status<br />

Messages Comment<br />

Internal monitor fault Cause:<br />

Serious internal error<br />

Corrective action<br />

Contact NUM CUSTOMER SERVICE<br />

Application time limit overrun Cause:<br />

RTC overrun (endless loop in a programme)<br />

Corrective action<br />

Correct the user programme<br />

Unknown PLC error Cause:<br />

Serious internal error<br />

Corrective action<br />

Contact NUM CUSTOMER SERVICE<br />

18 - 6 en-938846/6

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