Siemens A46999 fault code meaning
Siemens / A46999
Series: G210X, G220
OM DIO: Unknown alarm
converter
Meaning: An alarm that the firmware cannot recognize has occurred on the "Digital I/O" option module. This can occur if the component firmware is newer than the converter firmware.
Possible causes
Source: SINAMICS G210X Converter P1096; SINAMICS G220 Converter P1614