Siemens SINUMERIK 840D sl Function Manual page 700

Diagnostics
11.3 Safety messages for SINAMICS S120
N01620 (F, A) SI P1 (CU): Safe Torque Off active
Explanation The "Safe Torque Off" (STO) function of the basis functions has been selected on the Control Unit (CU) via
the input terminal and is active.
Note:
This message does not result in a safety stop response.
For STO selection using the Extended Functions, this message is not output.
Remedy Not necessary
Response for OFF2
F
Acknowledg‐ IMMEDIATELY (POWER ON)
ment for F
Response for NONE
A:
Acknowledg‐ NONE
ment for A
N01621 (F, A) SI P1 (CU): Safe Stop 1 active
Response NONE
Acknowledg‐ NONE
ment
Explanation The "Safe Stop 1" (SS1) function has been selected on the Control Unit (CU) and is active.
Note:
This message does not result in a safety stop response.
Remedy Not necessary
Response for OFF3
F
Acknowledg‐ IMMEDIATELY (POWER ON)
ment for F
Response for NONE
A:
Acknowledg‐ NONE
ment for A
F01625 SI P1 (CU): Sign-of-life error in the safety data
Response OFF2
Acknowledg‐ IMMEDIATELY (POWER ON)
ment
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Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated