Siemens A01020 fault code meaning
Siemens / A01020
Series: DCM-6RA80
Failure to write RAM
DC drive
Meaning: Write access to internal RAM failed.
Possible causes
Source: SINAMICS DCM, Parameter Manual, firmware version 1.5 SP2 (based on 5.1 SP2) P928
Series: G110M, G115D, G120-CU240B-E-2, G120-CU250S-2, G120C, G120D, G120X, G120XA, S120-S150
Failure to write RAM
converter
Meaning: Write access to internal RAM failed.
Possible causes
Source: SINAMICS G110M P665; SINAMICS G115D P712; SINAMICS G120, control unit CU240B-2_CU240E-2 P690; SINAMICS G120, control unit CU250S-2 P1275; SINAMICS G120C P640; SINAMICS G120D control unit CU240D- 2_CU250D- 2 P817; SINAMICS G120X converter P1348; SINAMICS G120XA PN converter P1263; SINAMICS S120_S150 P2506
Series: G200
Failure to write RAM
converter
Meaning: Write access to internal RAM failed. System messages 14.3 Faults and alarms SINAMICS G200 Basic converter Operating Instructions, 12/2025, FW V6.6, A5E54053398B AA 477
Possible causes
Source: SINAMICS G200 Basic converter P479
Series: G210, G210X, G220, S220
Failure to write RAM
converter
Meaning: Write access to internal RAM failed.
Possible causes
Source: SINAMICS G210 Converter P976; SINAMICS G210X Converter P844; SINAMICS G220 Converter P1178; SINAMICS S220 Converter P2055
Series: S110
Failure to write RAM
servo drive
Meaning: The write operation to internal RAM failed.
Possible causes
Source: SINAMICS S110 P924
Series: S200
Failure to write RAM
servo drive
Meaning: Write access to internal RAM failed.
Possible causes
Source: SINAMICS S200 PROFINET_SIMOTICS S-1FL2 P448
Series: S210
Failure to write RAM
servo drive
Meaning: Write access to internal RAM failed.
Possible causes
Source: SINAMICS S210_SIMOTICS S-1FK2 and S-1FT2 P1257