Siemens A01699 fault code meaning

Series: G110M, G115D, G120-CU240B-E-2, G120-CU250S-2, G120C, G120D

SI P1 (CU): A forced fault check of STO is required

converter

Meaning: The forced fault checking time set in p9659 for the "STO" function has been exceeded. When the "STO" function is deselected again, the message disappears and the monitoring time is reset.

Possible causes

Source: SINAMICS G110M P689; SINAMICS G115D P740; SINAMICS G120 Control Unit CU240B- 2_CU240E- 2 P819; SINAMICS G120 Control Units CU250S-2 P1032; SINAMICS G120C P664; SINAMICS G120D Control Unit CU240D- 2_CU250D- 2 P844

Series: G130-G150

SI P1 (CU): A forced fault check of STO is required

converter

Meaning:

Possible causes

Source: SINAMICS G130_G150 P1523

Series: S110

SI CU: Switch-off path test

servo drive

Meaning: The forced fault detection time set in p9659 for safety shutdown has been exceeded. The safety shutdown path must therefore be tested again. When the "STO" function is deselected again, the message disappears and the monitoring time is reset.

Possible causes

Source: SINAMICS S110 P971

Series: S120-S150

SI CU: Open-circuit test of the safety circuit required

converter

Meaning:

Possible causes

Source: SINAMICS S120 Drive Function Manual P761

Series: S210

SI P1: STO forced latent fault check required

servo drive

Meaning: The forced fault checking time set in p9659 for the "STO" function has been exceeded. When the "STO" function is deselected again, the message disappears and the monitoring time is reset.

Possible causes

Source: SINAMICS S210_SIMOTICS S-1FK2 and S-1FT2 P865

Series: S220

SI: Brake applied (holding) output must be tested

converter

Meaning: The brake output test time set in p9659 has been exceeded. The message disappears and the monitoring time is reset when the brake is applied or released again. Note: - This message does not trigger a safety stop reaction. - The test must be performed within the specified maximum time interval (p9659) to meet the basic requirements for timely fault detection and the conditions for calculating the safety function failure rate (PFH value). Operation beyond this maximum time interval is permitted if a forced check for latent faults can be ensured before personnel enter the hazardous area and rely on the safety function for protection. See also: p9659 (SI Brake output test timer), r9660 (SI Brake output test time remaining) Faults and alarms 5.5 Fault and alarm list SINAMICS S220 Converter 2170 Parameter Manual, 08/2026, FW V6.7, A5E53307549F AB

Possible causes

Source: SINAMICS S220 converter P2172