Delta ASDA-A3 Series User Manual page 507

Troubleshooting ASDA-A3
There are four types of alarms: General, STO, Communication, and Motion control.
General type: alarms caused by hardware or encoder signal errors.
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STO type: alarms caused by STO errors.
Communication type: alarms caused by CANopen or DMCNET errors.
Motion control type: alarms caused by motion control command (in PR mode) errors.
AL.nnn is the alarm format on the 7-segment display.
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Revision December, 2017