Siemens SINUMERIK 802D sl Manuel de l'opérateur télécharger pdf (Page 13)

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SINUMERIK 802D sl, Diagnostics Manual, 06/2009

Overview of alarms 2

2.1 NCK alarms

2000 PLC sign-of-life monitoring

Definitions: The PLC must give a sign of life within a defined period of time (MD10100

$MN_PLC_CYCLIC_TIMEOUT). If this does not occur, the alarm is triggered.

The sign of life is a counter reading on the internal NC/PLC interface which the PLC causes to count

up with the 10 ms time alarm. The NCK also tests cyclically whether the counter reading has changed.

Reaction: NC not ready.

Local alarm reaction.

Channel not ready.

NC Start disable in this channel.

Interface signals are set.

Alarm display.

NC Stop on alarm.

Remedy: Please inform the authorized personnel/service department. Check monitoring time frame in

MD10100 $MN_PLC_CYCLIC_TIMEOUT (reference value: 100ms).

Establish the cause of the error in the PLC and eliminate it (analysis of the ISTACK. If monitoring has

responded with a loop in the user program rather than with a PLC Stop, there is no ISTACK entry).

Program Con-

tinuation:

Switch control OFF - ON.

2001 PLC has not started up

Definitions: The PLC must give at least 1 sign of life within a period of time defined in MD10120

$MN_PLC_RUNNINGUP_TIMEOUT (default: 1 sec.).

Reaction: NC not ready.

Local alarm reaction.

Channel not ready.

NC Start disable in this channel.

Interface signals are set.

Alarm display.

NC Stop on alarm.

Remedy: - Please inform the authorized personnel/service department. The monitoring time in MD10120

$MN_PLC_RUNNINGUP_TIMEOUT must be checked and adapted to the first OB1 cycle.

- Determine the cause of error in the PLC (loop or stop in the user program) and eliminate it.

Program Con-

tinuation:

Switch control OFF - ON.

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Siemens SINUMERIK 802D sl Manuel de l'opérateur Page 13