Siemens SINUMERIK 840Di Diagnostic Manual page 379

11/2006
20144 Channel %1 block %2 motion synchronous action: system variable
access not possible
Parameters: %1 = Channel number
%2 = Block number
Definitions: When using system variables, it is assumed that a read/write operation can access the required data
successfully. In accesses to encoder actual values or digital I/Os, the result depends on the availability
of the corresponding hardware components. If an access within synchronized actions does not return
a valid value, alarm 20144 is output. Outside synchronized actions, such a read/write access causes
block execution to be interrupted until the result is available. Block execution is subsequently
continued.
Reaction: NC Start disable in this channel.
Interface signals are set.
Alarm display.
NC Stop on alarm.
Remedy: Before reading/writing system variables, ensure that it is possible to access the required hardware
components.
Program Clear alarm with the RESET key. Restart part program
Continuation:
20145 Channel %1 block %2 motion synchronous action: arithmetic error
Parameters: %1 = Channel number
%2 = Block number
Definitions: In calculating an arithmetic expression for a motion synchronous action, an overflow has occurred
(e.g. division by zero).
Reaction: NC Start disable in this channel.
Interface signals are set.
Alarm display.
NC Stop on alarm.
Remedy: Correct error in expression.
Program Clear alarm with the RESET key. Restart part program
Continuation:
20146 Channel %1 block %2 motion synchronous action: nesting depth
exceeded
Parameters: %1 = Channel number
%2 = Block number
Definitions: For calculating arithmetic expressions in motion synchronous blocks, an operand stack with a fixed
set size is used. With very complex expressions, this stack can overflow.
Reaction: NC Start disable in this channel.
Interface signals are set.
Alarm display.
NC Stop on alarm.
Remedy: Correct error in expression.
Program Clear alarm with the RESET key. Restart part program
Continuation:
© Siemens AG, 2006. All rights reserved
SINUMERIK, SIMODRIVE Diagnostics Manual (DA), 11/2006 Edition
Overview of Alarms
NCK alarms
2-379