BECKHOFF EL6900-FB - Manual (Page 43)

Function blocks
Function blocks for TwinSAFE logic terminals 41
3.6 The DECOUPLE function block
3.6.1 Functional description
The FB DECOUPLE is for uncoupling of signals from a TwinSAFE connection. The function block has 8
inputs and 8 outputs, whereby the inputs are looped one-to-one on the outputs. The associated output
must be linked as soon as one of the block inputs is used. The converse is also valid.
Figure 3-11: DECOUPLE function block
It is possible to subdivide and decouple the signals of a TwinSAFE connection into several TwinSAFE
groups, using the FB DECOUPLE, since a TwinSAFE connection is always assigned to a TwinSAFE
group. The block within an existing TwinSAFE group can be used to subdivide the signals. The block
must be used in a separate TwinSAFE group in case the signals should be decoupled, since all used
outputs of the TwinSAFE group can be switched off in case of a connection communication error. The
input signals of a TwinSAFE connection can now be linked with the FB DECOUPLE inputs, and the
outputs distributed over the different TwinSAFE groups. It operates the same way in the other directions,
the outputs of a TwinSAFE connection are linked with the FB DECOUPLE outputs, the FB DECOUPLE
inputs can once again come from various TwinSAFE groups.