3 Operation
(continued)
C232-302-401/402/403/404-603 / C232/EN M/A23 3-127
3.19 Programmable Logic (Function Group LOGIC)
Programmable (or user-configurable) logic enables the user to link binary signals within
a framework of Boolean equations.
Binary signals in the C232 can be linked by logical ‘OR’ or ‘AND’ operations or by
additional ‘NOT’ operations by setting LOGIC: Fct. assignm. outp. n, where
n = 1 to 32. The Boolean equations need to be defined without the use of brackets. The
following rule applies to the operators: ‘NOT’ before ‘AND’ before ‘OR’.
A maximum of 32 elements can be processed in one Boolean equation. In addition to
the signals generated by the C232, initial conditions for governing the equations can be
set from the local control panel, through binary signal inputs, or through the serial
interfaces.
Logical operations can be controlled through the binary signal inputs in different ways.
The binary input signals LOGIC: Input n EXT (n=1to16)haveanupdating
function, whereas the input signals LOGIC: Set n EXT (n = 1 to 8) are stored. The
logic can only be controlled from the binary signal inputs that are configured for
LOGIC: Set n EXT if the corresponding reset input (LOGIC: Reset n EXT)
has also been configured for a binary signal input. If only one or neither of the two
functions is configured, then this is interpreted as ‘Logic externally set’. If the input
signals of the two binary signal inputs are implausible (such as when they both have a
logic value of ‘1’), then the last plausible state remains stored in memory.
