Siemens SINUMERIK 840Di Diagnostic Manual page 427

11/2006
26020 Axis %1 encoder %2 hardware fault %3 during encoder initialization
Parameters: %1 = Axis name, spindle number
%2 = Encoder number
%3 = Error fine coding
Definitions: Error during initialization of encoder (refer to additional information for absolute encoder interface from
error fine coding).
The alarm can be reprogrammed in the MD ALARM_REACTION_CHAN_NOREADY (channel not
ready).
Reaction: Mode group not ready.
The NC switches to follow-up mode.
Channel not ready.
NC Start disable in this channel.
Axes of this channel must be re-referenced.
Interface signals are set.
Alarm display.
NC Stop on alarm.
Channel not ready.
Remedy: Please inform the authorized personnel/service department. Rectify hardware error, replace encoder
if necessary. Make sure that an appropriate control module supporting this function is available with
EnDat or SSI absolute encoders.
Bit nos. and their significance:
Bit 0: Lighting failed
Bit 1: Signal amplitude too small
Bit 2: Position value incorrect
Bit 3: Overvoltage
Bit 4: Undervoltage
Bit 5: Overcurrent
Bit 6: Battery change necessary
Bit 7: Control check error, Note: SW 4.2 and higher, synchronous linear motor
Bit 8: EnDat encoder, incorrect overlapping, Note: SW 4.2 and higher, synchronous linear motor
Bit 9: C/D track error on encoder ERN1387 or EQN encoder connected or incorrectly configured (not
on EQN, MD 1011)
Bit 10: Log cannot be aborted or old hardware
Bit 11: SSI level detected on data line or no encoder connected or incorrect encoder cable (ERN
instead of EQN)
Bit 12: Timeout while reading measuring value
Bit 13: CRC error
Bit 14: Wrong IPU submodule for direct measuring signal, Note: Only with 611D expansion
Bit 15: Encoder faulty
Note: If an axis that is connected to the second measuring system of a controller module 611D only,
is driven by an absolute encoder, the axis with the first measuring system of this controller module will
have to be switched to Parking Axis, after the measuring system connector has been plugged in and
prior to disabling the Parking Axis. After the Parking Axis of the first measuring system has been
disabled, all measuring systems of the controller module will be initialized. The Parking Axis of the
second measuring system can then be disabled without errors.
Program Switch control OFF - ON.
Continuation:
© Siemens AG, 2006. All rights reserved
SINUMERIK, SIMODRIVE Diagnostics Manual (DA), 11/2006 Edition
Overview of Alarms
NCK alarms
2-427