Siemens SINUMERIK 840Di Diagnostic Manual page 116

Overview of Alarms
NCK alarms
10720 Channel %1 block %3 axis %2 software limit switch %4
Parameters: %1 = Channel number
%2 = Axis name, spindle number
%3 = Block number, label
%4 = String ( + or - )
Definitions: The path programmed for the axis violates the currently valid software limit switch. The alarm is
activated when preparing the part program block.
If bit 11=0 in the machine data $MN_ENABLE_ALARM_MASK, this alarm is issued instead of alarm
10722. If bit 11 is set in the machine data $MN_ENABLE_ALARM_MASK, an expanded diagnostics
option is offered for the software limit switch violation. The condition for activation is the presence of
the ALUN* alarm file in the HMI.
Reaction: Correction block is reorganized.
Local alarm reaction.
Interface signals are set.
Alarm display.
Remedy: Check and correct positions in the NC program.
Please inform the authorized personnel/service department.
Machine data: 36100 POS_LIMIT_MINUS/36120 POS_LIMIT_MINUS2 and 36110
POS_LIMIT_PLUS/36130 POS_LIMIT_PLUS2 must be checked for the software limit switches.
Check the axis-specific interface signals: "2nd software limit switch plus/minus" (DB 31 -61, DBX 12.2
and 12.3) to see whether the 2nd software limit switch is selected.
Check currently active work offsets via the current frame.
Work offsets, overlaid movements ($AA_OFF), DRF and transformations components must also be
checked.
Program Clear alarm with NC START or RESET key and continue the program.
Continuation:
10721 Channel %1 block %3 axis %2 software limit switch %4
Parameters: %1 = Channel number
%2 = Axis name, spindle number
%3 = Block number, label
%4 = String ( + or - )
Definitions: The motion planned for the axis violates the currently valid software limit switch.
The alarm is activated during the preparation of approach or rest blocks for REPOS.
This alarm is issued instead of alarm 10723 if bit11=0 in machine data
$MN_ENABLE_ALARM_MASK. If bit11 is set in this machine data $MN_ENABLE_ALARM_MASK,
an expanded diagnostics option is offered for the software limit switch violation. The condition for
activation is the presence of the ALUN* alarm file in the HMI. See also the diagnostics guide for alarm
10723.
Reaction: Local alarm reaction.
Interface signals are set.
Alarm display.
Remedy: Determine the cause of the offset from the initial or target position. The REPOS command is executed
at the end of an ASUB or system ASUB. See also cross reference from ASUBs.
Check the axis-specific interface signals "2nd software limit switch plus/minus" (DB31-61, DBX 12.2
or 12.3) to see whether the 2nd software limit switch is selected.
Check the currently active work offset via the current frame.
Also check the external work offsets, overlaid movements ($AA_OFF), DRF and transformation
components.
Cancel the NC program with NC reset.
Program Clear alarm with the RESET key. Restart part program
Continuation:
2-116
© Siemens AG, 2006. All rights reserved
SINUMERIK, SIMODRIVE Diagnostics Manual (DA), 11/2006 Edition
11/2006