Chapter 17 Safe Torque Off FunctionMS300 
775 
 
17-6-4 STL1, Pr.06-44 = 0 or 1 
As shown in Figure 17-8, when S1–DCM is OFF during operation (STO function is required) and S2–
DCM is ON (STO function is not required), the drive stops outputting and the keypad shows the STL1 
error. However, you cannot reset the STL1 error even if the S1 status is restored (ON) regardless of 
the parameter setting. You must cycle the power to reset and to restore the drive to the normal 
standby state.   
   
Figure 17-8 
17-6-5 STL2, Pr.06-44 = 0 or 1 
As shown in Figure 17-9, when S1–DCM is ON during operation (STO function is not required) and 
S2–DCM is OFF (STO function is required), the drive stops outputting and the keypad shows the 
STL2 error. However, you cannot reset the STL2 error even if the S2 status is restored (ON) 
regardless of the parameter setting. You must cycle the power to reset and to restore the drive to the 
normal standby state.   
 
   
 
Figure 17-9