No Valid Firmware; Plc Sign-Of-Life Monitoring; Plc Has Not Started Up; Nck Battery Warning Threshold Reached - Siemens Sinumerik 840D sl Diagnostic Manual

Overview of Alarms

NCK alarms
1100

No valid firmware

Definitions: No memory card or memory card without valid firmware (license) inserted.
Reaction: Alarm display.
Remedy: Make a note of the error text and contact Siemens AG A&D MC, Hotline (tel./fax: see alarm 1000)
Program Con- Switch control OFF - ON.
tinuation:
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- Switch control OFF - ON.
tinuation:
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- Switch control OFF - ON.
tinuation:
2100

NCK battery warning threshold reached

Definitions: The undervoltage monitor of the NCK battery has reached the prewarning threshold. This is at 2.7-2.9
V (nominal voltage of the battery is 3.0-3.1 V at 950 mAh).
Reaction: Alarm display.
Remedy: Please inform the authorized personnel/service department. The battery must be replaced within the
next 6 weeks. After this period, the voltage can drop below the alarm limit of 2.4-2.6 V if the RAMs to
be buffered take up a lot of current.
Program Con- Clear alarm with the Delete key or NC START.
tinuation:
2101 NCK battery alarm
Definitions: The undervoltage monitoring (2.4 - 2.6 V) of the NCK battery has responded during cyclic operation.
Reaction: Alarm display.
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SINUMERIK 840D sl, 840Di sl, SINAMICS, Diagnostics Manual (DAsl), 03/2009
© Siemens AG, 2009. All Rights Reserved
03/2009