8 STO (safe torque off)
8.6 Circuit examples
The following sections provide circuit examples with detailed drawings and notes.
8.6.1 Safe torque off (STO)
Figure 119: Connection of the integrated STO function (single-phase servo drive)
Pos. Description
1 Servo drive with an integrated STO function (only the relevant connections are
shown)
2a Emergency stop button
2b Safety gate
2c Light grid
2d Safety relay
The "Safe Torque Off" (STO) safety function can be requested by various devices. Switch
S1 can be, for example, an emergency-stop switch, a switch of a protective gate, a light
grid or a safety relay. The safety request is realised via two channels and via the switch
S1. As a result, the output stage will be switched off via two channels.
Product manual BL 4000-C Page 201 of 298
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