Siemens SINUMERIK 840Di Diagnostic Manual page 476

Overview of Alarms
NCK alarms
27113 Axis %1 hardware encoder error of the safe actual value.
Parameters: %1 = Axis number
Definitions: Encoder evaluation outputs a hardware error. The reasons may be pollution in
the visual encoder evaluation or problems during signal transmission.
Reaction: Alarm display.
In addition, a Stop F is triggered that may cause follow-up alarm 27001 with error code 0 as well as
alarms 27023 and 27024.
Alarm 27001 with error code 0 can be avoided by alarm reduction
($MA_SAFE_ALARM_SUPPRESS_LEVEL higher or equal to 1).
Remedy: Verification of compliance with the EMC regulations.
Replace the encoder hardware.
Program Clear alarm with the RESET key. Restart part program
Continuation:
27124 Stop A triggered at least in 1 axis
Definitions: This is only an informational alarm indicating that Stop A has been triggered in at least 1 axis and
Power On is required for alarm acknowledgment.
This alarm occurs if the alarm priority function was activated in MD
$MN_SAFE_ALARM_SUPPRESS_LEVEL.
Reaction: Interface signals are set.
Alarm display.
Trigger a "Pulse suppression" for the affected axis.
Remedy: Find the error cause by means of further alarm messages.
Program Switch control OFF - ON.
Continuation:
27140 Waiting for motor module of at least one axis.
Definitions: Alarm during ramp-up as long as the motor module of at least one axis is not yet ready for SI.
Communication to the motor module during ramp-up has not yet been activated; the safety functions
of at least one axis are not yet available.
Via MD $MN_SAFE_ALARM_SUPPRESS_LEVEL (MD<3) the alarm display can be set to display for
each axis individually whether communication has been activated.
Reaction: Interface signals are set.
Alarm display.
Remedy: The alarm will remain present during ramp-up if at least one drive does not communicate (for example,
if the PROFIBUS plug has fallen out). Otherwise, the alarm will only briefly be displayed, and then be
deleted automatically.
Possible causes of the continual presence of the alarm:
Safe motion monitoring has been activated for at least one axis only in
$MA_SAFE_FUNCTION_ENABLE, but not in the corresponding parameter of the assigned drive
(p9501). Check the correctness of parameter p9501 and the assignment of the drive in MD
$MA_SAFE_CTRLOUT_MODULE_NR, $MN_SAFE_DRIVE_LOGIC_ADDRESS, p0978.
Program Alarm display showing cause of alarm disappears. No further operator action necessary.
Continuation:
2-476
© Siemens AG, 2006. All rights reserved
SINUMERIK, SIMODRIVE Diagnostics Manual (DA), 11/2006 Edition
11/2006