Weg CFW500-SFY2 CFW500 STO Safety Function Module: Safe Torque Off (STO) / Stop Category 0, Safe Stop 1 Time Controlled (SS1-t) / Stop Category 1; Safety Category: SIL 3, PLe, Use in CFW500-IP66 230VAC & 460VAC in addition to the IOS module, any other I/O $88.20 Select