Siemens alarm 148*/152*: SW limit switch plus / minus
SINUMERIK 840C legacy alarm · Siemens 840C
What it means
The first software limit switch was approached in plus (148*) or minus (152*) direction - or the second pair when the PLC signal 'Second software limit switch active' is set. Software limits only take effect after reference-point approach; jog away in JOG mode and verify limit machine data.
Likely causes
- Programmed motion beyond permitted traversing range
- Limit values not updated after fixture change
- Referencing incomplete so limits sit incorrectly
Triage note: * suffix = axis index
Need the part urgently?
Send us alarm 148*/152* with your machine details — typical RFQ turnaround is 24–48h.