Sinumerik Alarm 300744 Axis %1 drive %2 safety monitoring checksum invalid, confirmation and acceptance test required!
%1 = NC axis number
%2 = Drive number
The actual checksum of the safety-relevant MDs calculated by the drive and stored in MD 1398: $MD_SAFE_ACT_CHECKSUM (display of the checksum of the machine data for safe functions) has another value than the setpoint checksum stored during the last machine acceptance in MD 1399: $MD_SAFE_DES_CHECKSUM (checksum of the machine data for safe functions). The safety-relevant data have been modified or there is an error. Request: During boot-up of the control.
– Mode group not ready.
– Channel not ready.
– NC Start disable in this channel.
– NC Stop on alarm.
– Alarm display.
– Interface signals are set.
Check, and if necessary, correct all safety-relevant MDs. Then perform POWER ON. Perform acceptance test.
Switch control OFF – ON.
- Siemens Diagnostics Guide by Siemens