106 Rockwell Automation Publication 2097-UM002D-EN-P - April 2017
Chapter 6 Kinetix 350 Drive Safe Torque-off Feature
Safe Torque-off Wiring Requirements
The following are the safe torque-off (STO) wiring requirements. The wire
must be copper with 75 °C (167 °F) minimum rating.
Figure 48 - Safe Torque-off (STO) Terminal Plug
IMPORTANT The National Electrical Code and local electrical codes take precedence over
the values and methods provided.
IMPORTANT Stranded wires must terminate with ferrules to prevent short circuits, per
table D7 of EN ISO 13849.
1 2 3 4 5 6
+24 V DC control
Control COM
Safety status
Safety input 1
Safety COM
Safety input 2
Table 42 - Safe Torque-off (STO) Terminal Plug Wiring
Safe Torque-off (STO) Connector Recommended Wire Size
Strip Length
mm (in.)
Torque Value
N•m (lb•in)
Pin Signal
Stranded Wire
with Ferrule
mm² (AWG)
Solid Wire
mm²
(AWG)
STO-1
STO-2
STO-3
STO-4
STO-5
STO-6
+24V DC Control
Control COM
Safety Status
Safety Input 1
Safety COM
Safety Input 2
0.75 (18) 1.5 (16) 6 (0.25) 0.2 (1.8)
IMPORTANT Use only pins STO-1 (+24V DC Control) and STO-2 (Control COM) of the
motion-allowed jumpers to defeat the safe torque-off function. When the
safe torque-off function is in operation, the 24V supply must come from an
external source.
IMPORTANT To be sure of system performance, run wires and cables in the wireways as
established in the user manual for your drive.
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