Siemens SINUMERIK 840D sl Function Manual page 665

27112 Axis %1 CRC error of the safe actual value
Parameter %1 = axis name, spindle number
Explanation When checking the data consistency of the safe actual value (CRC), an error was detected.
Possible causes for the alarm being permanently present:
● The NCK monitoring channel for safety motion monitoring does not communicate with the monitoring
channel of the assigned drive, but that of another axis.
● Error in the encoder parameterization
● Incorrect encoder evaluation type
● Communication errors between the NCK and drive
Response Alarm display
In addition, a STOP F is initiated, that can result in the subsequent Alarm 27001 with fault IDs 0, 27023 and
27024. Alarm 27001 with fault ID 0 can be prevented using the alarm reduction (MD10094
$MA_SAFE_ALARM_SUPPRESS_LEVEL greater than or equal to 1).
Remedy Check the assignment of the drive via HW Config, MD36906 $MA_SAFE_CTRLOUT_MODULE_NR,
MD10393 $MN_SAFE_DRIVE_LOGIC_ADDRESS and p0978 for correctness.
Check the encoder mounting
Check the encoder parameterization
Check NCK-MD (MD36916 $MA_SAFE_ENC_IS_LINEAR, MD36917
$MA_SAFE_ENC_GRID_POINT_DIST, MD36909 $MA_SAFE_ENC_RESOL) and the drive parameter field
r0979
For a DRIVE-CLiQ encoder: Check NCK-MD (MD36924 $MA_SAFE_ENC_NUM_BITS, MD36929
$MA_SAFE_ENC_CONF) and drive parameter r047x.
For DRIVE-CLiQ linear encoders, also check NCK-MD MD36909 $MA_SAFE_ENC_MEAS_STEPS_RESOL
and MD36913 $MA_SAFE_ENC_MEAS_STEPS_POS and drive parameter r0469 / r0473.
Check whether the encoder evaluation was replaced (SMI, SMC, SME)
Check whether the encoder evaluation type was replaced (SMx, DRIVE-CLiQ encoder)
Check the encoder ID in the MD $MA_SAFE_ENC_IDENT
Check and ensure that the EMC directive is complied with.
Replace the hardware
Program con‐ Clear the alarm with the RESET key. Restart the part program.
tinuation
27113 Axis %1 hardware encoder fault of the safety-related actual value
Parameter %1 = axis name, spindle number
Explanation The encoder evaluation signals a hardware fault.
The following causes are possible:
Dirty optical encoder evaluation
Signal transfer problems
Missing encoder number after replacing the encoder (involves encoders with serial number, built-in motors
or third-party motors)
Response Alarm display
In addition, a STOP F is initiated, that can result in the subsequent Alarm 27001 with fault IDs 0, 27023 and
27024. Alarm 27001 with fault ID 0 can be prevented using the alarm reduction (MD10094
$MA_SAFE_ALARM_SUPPRESS_LEVEL greater than or equal to 1).
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
11.2 NCK safety alarms for SINUMERIK 840D sl
Diagnostics
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