Fig. 18 Default Twinsafe Logic Program For Ax8911 - Beckhoff AX8-1 Series Documentation

Use of the STO function
Hardware inputs / TwinSAFE signals
Hardware inputs and signals via the TwinSAFE connection are equivalent. If one of the two
supplies the enable signal to move the axis, the axis can be moved.
Note
If this does not suit the functionality desired by the user, the fail-safe program on the
AX8911 can be replaced by the user or the machine manufacturer with a program suitable
for the application case.
Fig. 18: Default TwinSAFE logic program for AX8911
Brake control
Brake control currently takes place only by the AX8000 in accordance with the parameteri-
zation in the TC3 Drive Manager 2. The brake output is generally enabled in the AX8911
Attention
firmware. The default TwinSAFE logic program shown above is implemented accordingly
on the AX8911; however, the brake outputs 1 and 2 currently have no effect. The Brake
(over FSoE) signal does not exist in the TwinSAFE connection.
STO switch-off paths
There are four STO switch-off paths per axis within the logic (STO output A - D). If the
safety logic on the AX8911 is replaced by a user-specific project, all four switch-off paths
Note
must be set for each axis.
34 Version: 1.0.0 AX8911 - TwinSAFE Drive Option