2.4 Starting the PLC functions
By default (factory setting), the PLC functions are stopped and must be started by clicking but-
ton "Start PLC". In stop mode, no instructions are processed and the output buffer is not writ-
ten.
Run the following menu commands:
− Syntax check
− Translation and download (to frequency inverter)
− Start PLC
Note:
Instructions can only be edited in stop mode.
2.5 Principle for digital functions (input settings [Boolean])
The digital function processing principle is shown in the following diagram. The digital input
buffer comprises 16 PLC signals which can be assigned to global sources. The values in the
input buffer are available to the instructions as sources.
The instructions can be combined with up to 4 input values. The outputs of the instructions can
be used as inputs of other instructions (non-negated outputs O1 and negated outputs O2).
The instructions are processed one after the other, starting with instruction 1. When the
processing cycle jumps back to start, the output buffer is written and the input buffer is up-
dated.
Jump functions enable branching off to certain instructions (indices). The instruction parame-
ters of the jump function additionally enable selective writing of the output buffer and updating
of the input buffer.
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