Siemens SINUMERIK 840D sl Series Diagnostics Manual page 766

Overview of Alarms
Cause: A alarm has occurred on the sensor module for encoder 2 that cannot be interpreted by the
control unit firmware.
This can occur if the firmware on the sensor module for encoder 2 is more recent than the
firmware on the control unit.
Alarm value (r2124, decimal):
Alarm number.
If required, the significance of this new alarm can be read about in a more recent
description of the control unit.
Remedy: - replace the firmware on the sensor module by an older firmware version (r0148).
- upgrade the firmware on the control unit (r0018).
233100 <location>Encoder 3: Zero mark clearance error
Reaction: A_INFEED: NONE (DCBRAKE, OFF1, OFF2, OFF3, STOP1, STOP2)
SERVO: ENCODER (DCBRAKE, NONE, OFF1, OFF2, OFF3, STOP1, STOP2)
Acknowledge: READY
Cause: The measured zero mark clearance does not correspond to the parameterized zero mark
clearance (p0425 for rotating encoders).
Fault value (r0949, decimal):
Last measured zero mark clearance in increments (4 increments = 1 encoder pulse).
The sign designates the direction of motion when detecting the zero mark clearance
(distance).
Remedy: - check that the encoder cables are routed in compliance with EMC.
- check the plug connections.
. check the encoder type (encoder with equidistant zero marks).
- adapt the parameter for the clearance between zero marks (p0425).
- replace the encoder or encoder cable.
233101 <location>Encoder 3: Zero mark failed
Reaction: A_INFEED: NONE (DCBRAKE, OFF1, OFF2, OFF3, STOP1, STOP2)
SERVO: ENCODER (DCBRAKE, NONE, OFF1, OFF2, OFF3, STOP1, STOP2)
Acknowledge: READY
Cause: The 1.5 x parameterized zero mark clearance was exceeded (p0425 for rotating
encoders).
Fault value (r0949, decimal):
Number of increments after POWER ON or since the last zero mark that was detected (4
increments = 1 encoder pulse).
Remedy: - check that the encoder cables are routed in compliance with EMC.
- check the plug connections.
. check the encoder type (encoder with equidistant zero marks).
- adapt the parameter for the clearance between zero marks (p0425).
- replace the encoder or encoder cable.
233110 <location>Encoder 3: EnDat communications error
Reaction: A_INFEED: NONE
SERVO: ENCODER (DCBRAKE, NONE)
Acknowledge: READY
Cause: Serial communication protocol transfer error between the encoder and evaluation module
SMCxx.
Fault value (r0949, binary):
Bit 0: Alarm bit in the position protocol.
Bit 1: Incorrect quiescent level on the data line.
Bit 2: EnDat encoder does not response (does not supply a start bit).
Bit 3: CRC error: The checksum in the protocol from the encoder does not match the data.
Bit 4: Incorrect encoder acknowledgement: The encoder incorrectly understood the task
(request) or cannot execute it.
Bit 5: Internal error in the EnDat driver: An illegal mode command was requested.
Bit 6: Position value longer than 40 bits.
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SINUMERIK 840D sl/840D/840Di/810D Diagnostics Guide (DA), 08/2005 Edition
© Siemens AG, 2005. All rights reserved
08/2005