Siemens A7479 fault code meaning
Siemens / A7479
Series: V90
EPOS: Negative software limit switch reached
servo drive
Meaning: Message class: Application/technology function fault (17). The axis is at the negative software limit switch position. The active traversing block is interrupted. Correct the target position. See: p2580 (EPOS Negative software limit switch), p2582 (Activate EPOS software limit switches).
Possible causes
Source: SINAMICS V90 PROFINET, SIMOTICS S-1FL6 Operating Instructions P394