Function blocks
66 Function blocks for TwinSAFE logic components
3.6 The function block DECOUPLE
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. The inputs are looped through to the outputs one-to-one. The associated output
must be linked as soon as one of the function block inputs is used. The converse is also valid.
Figure 3-23: DECOUPLE function block
A TwinSAFE connection to a TwinSAFE I/O terminal is always assigned to a TwinSAFE group. Via the
FB DECOUPLE it is possible to pass on the signals of a TwinSAFE connection to other TwinSAFE
groups and thus decouple them.
The function block within an existing TwinSAFE group can be used to subdivide the signals.
The function 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.
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