BECKHOFF KL6904 - Manual (Page 40)

Operation
38 KL6904
The project is then displayed in text mode, and the user has to confirm consistency between the
information displayed and the currently projected application by re-entering the password.
The project is then started on the KL6904.
4.2.10.1 KL6904 project design limits
TwinSAFE connections max. 7 or 15 (see Inserting a KL6904)
TwinSAFE blocks 48 max.
TwinSAFE groups 8 max.
Standard PLC inputs max. 24 bit
Standard PLC outputs max. 24 bit
Note
TwinSAFE connection
Only one TwinSAFE connection between two TwinSAFE terminals is possible.