Siemens SINUMERIK 840Di sl - 9.1 Startup main screen

NC Commissioning with HMI Advanced
11.5 Axes and spindles
Manual
430 Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
Position tolerance when switching over the encoder
It is possible to switch between the two encoders or position measuring systems of a
machine axis at any time. The permissible position difference between the two position
measuring systems is monitored.
● MD36500 $MA_ENC_CHANGE_TOL (Max. tolerance on position actual value switchover)
Error reaction:
● Alarm "25100 Measuring system cannot be switched over"
The requested switchover to another encoder is not carried out.
Causes of error/error handling:
● The specified permissible tolerance is too small.
● The measuring system to which you will switch over is not referenced.
Cycl. Monitoring the encoder position tolerance
The position difference between the two encoders or position measuring systems of a
machine axis is monitored with the following machine data:
● MD36510 ENC_DIFF_TOL (measuring system synchronism tolerance)
Error reaction:
● Alarm "25105 Measuring systems are not synchronous"
and stopping the machine axes using a speed setpoint ramp whose characteristic curve is
set in the following machine data:
● MD36610 $MA_AX_EMERGENCY_STOP_TIME (braking ramp time when errors occur)
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Figure 11-22 Monitoring for SINUMERIK 840Di sl