Siemens SINUMERIK 840D sl Function Manual page 96

Detailed description
2.1 Axis monitoring
2.1.5.6 Monitoring of hardware faults
Function
This monitoring function monitors the measuring systems of a machine axis for hardware
faults (e.g., measuring system failure, open circuit).
Fault
Alarm 25000
If a hardware fault is detected in the active measuring system, alarm 25000 appears:
"Axis <Axis identifier> Hardware fault active encoder"
The affected axis is stopped via the configured braking ramp in follow-up mode:
MD36610 $MA_AX_EMERGENCY_STOP_TIME
(Maximum time for braking ramp when an error occurs)
Alarm 25001
If a hardware fault is detected in the passive measuring system, alarm 25001 appears:
"Axis <Axis identifier> Hardware fault passive encoder"
There is no further alarm response.
Notice
For hardware faults, the referencing status of the machine axis is reset:
DB31, ... DBX60.4 / 60.5 = 0 (referenced/synchronized 1 / 2)
2.1.6 Measuring-system monitoring (systems with PROFIBUS drives)
The NC has no direct access to the measuring-system hardware for systems with
PROFIBUS drives and therefore measuring-system monitoring is mainly performed by the
drive software.
References:
Drive Functions SINAMICS S120
/FBU/SIMODRIVE 611 universal Function Manual
Encoder-limit-frequency monitoring
In the case of systems with PROFIBUS drives, encoder-limit-frequency monitoring is also
performed in the NCK.
30
Basic logic functions: Axis monitoring, protection zones (A3)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0