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POU header
All input and output variables which are used for programming the function block RS are declared
in the POU header. This also includes the function block (FB) itself. By declaring the FB you create
a copy of the original FB. This copy is saved under copy_name, and a separate data area is
reserved.
Body
If set is set (status = TRUE) the signal_output will be set. If only reset is set, the signal_output
will be reset (status = FALSE). If both set and reset are set, the signal_output will be reset to
FALSE.
LD
ST
When programming with structured text, enter the following:
copy_name( SET:= set, RESET:= reset);
signal_output:= signal_output;
Bistable instructions
309
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