Description
The self-diagnostic function for the STO (Safety Torque Off) signal detected a mismatch.
Subcode description
The meaning of each sub code is
as follows:
CPU1 1:STO1
CPU1 2:STO2
CPU1 3:STO3
CPU1 4:STO4
CPU2 1:STO1
CPU2 2:STO2
CPU2 3:STO3
CPU2 4:STO4
Causes and remedies
| Cause | Remedy |
|---|---|
| ASF01 board (abnormal) | 1. Reset the alarm. 2. If the alarm recurs, replace the ASF01 board. For a system with multiple ASF01 boards connected, replace the ASF01 board connected to the signal that generated the alarm. |
| SDCA01 board (abnormal) | 1. Reset the alarm. 2. If the alarm recurs, replace the SDCA01 board. For a system with multiple SDCA01 boards connected, replace the SDCA01 board connected to the signal that generated the alarm. |
| Other | If the alarm occurs again after implementing the countermeasures, contact our service department and describe the circumstances when CMOS.BIN was saved (operating procedure, etc.). |