Sinumerik Alarm 20144 Channel %1 block %2 motion synchronous action: system variable access not possible
%1 = Channel number
%2 = Block number
When using system variables, it is assumed that a read/write operation can access the required data successfully. In accesses to encoder actual values or digital I/Os, the result depends on the availability of the corresponding hardware components. If an access within synchronized actions does not return a valid value, alarm 20144 is output. Outside synchronized actions, such a read/write access causes block execution to be interrupted until the result is available. Block execution is subsequently continued.
– NC Start disable in this channel.
– NC Stop on alarm.
– Alarm display.
– Interface signals are set.
Before reading/writing system variables, ensure that it is possible to access the required hardware components.
Clear alarm with the RESET key. Restart part program
- Siemens Diagnostics Guide by Siemens