Axis %1 drive %2 zero mark monitoring of motor measuring system


%1 = NC axis number

%2 = Drive number


An error was detected in the number of encoder lines counted to modulo (16/10) on crossing of the zero marker. Increments were lost or added.

The alarm can be reprogrammed in the MD ALARM_REACTION_CHAN_NOREADY (channel not ready).


-    Mode group not ready.

-    The NC switches to follow-up mode.

-    Channel not ready.

-    NC Start disable in this channel.


-    Interface signals are set.

-    Alarm display.

-    NC Stop on alarm.

-    Channel not ready.

Please inform the authorized personnel/service department.

Use original Siemens encoder cables (they have a higher degree of screening).

Check the encoder, encoder cable and shield connection for loose contact or cable breakage.

Check the shield connection on the front plate of the controller module (top screw).

For a gearwheel encoder, check the distance between the gearwheel and the sensor. Replace the encoder, encoder cable or control module.

Check the metallized intermediate circuit cover.

Program Continuation:

If a BERO proximity switch is used, the zero marker of the encoder is still being monitored and not the BERO signal.

Switch control OFF - ON.

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