User Manual

Control concept
Superposed plant controls
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block is placed before plant control as illustrated in the following figure. All potential influences are
interconnected, prioritized by importance on the block and the corresponding required plant operating
mode is determined.
Example:
● A fire detector as a high priority (P04) and requires the plant operating mode EmergOff.
● The smoke extraction switch has the highest priority (P01) and demands plant operating mode smoke
extraction.
● The scheduler has a low priority (P11) and demands plant operating modes Stage 1, Stage 2 and Off.
The output [Val] for ENSEL_MS now supplies the CMD_CTL the resulting plant operating mode for
additional processing. It is important that the multistate enumerations for both blocks ENSEL_MS and
CMD_CTL are the same. The multistate values are not text, but rather numbers based.
Superposed command control CMD_CTL
The command control CMD_CTL block is used primarily for the sequence control in the ventilation plants.
The block makes it possible to sequentially switch on and off the aggregates. As it is implemented in a very
general and flexible way, other fields of application are also conceivable, e.g., for refrigeration plants.