3 Operation
(continued)
148 C232-302-401/402/403/404-603 / C232/EN M/A23
3.21 Interlocking Logic (Function Group ILOCK)
The switching commands to the controllable switchgear units of the bay are not enabled
until the interlock conditions have been checked. The interlocks are defined in the form
of Boolean equations in the interlocking logic function.
The choice of the bay type automatically defines the bay interlock conditions (or
equations) for the ‘Open’ and ‘Close’ operations of the individual switchgear units in the
bay. Different conditions are defined for the bay interlock equations for operation with or
without station interlock (see the section entitled “List of Bay Types” in the Appendix).
These automatically defined interlock conditions - determined by the choice of bay type -
can be modified by the users at any time to fit their station requirements. For the bay
interlock, the following signals acquired by the C232 are linked by logic operations:
Function blocks 1 and 2
The programmable logic outputs
The signals from binary inputs after debouncing and chatter suppression
The position signals of the switchgear units after debouncing and chatter suppression
A maximum of 32 equations with 32 equation elements each are available for definition
of the interlock conditions. The Boolean equations need to be defined without the use of
brackets. The following rule applies to the operators: ‘NOT’ before ‘AND’ before ‘OR’.
The output signal of one equation can be processed as the input signal for another
higher-order equation, and this makes it possible to have a sequence of interlinked
Boolean equations.
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