Overview

3.1 Overview

3.1.1Outline of Operation Processings

This section outlines processings performed from when the inverter is powered on until a sequence program is executed.

The built-in PLC function processings are roughly classified into the following three types.

(1)Initial processing

Pre-processing for executing sequence operation. This processing is executed only once when power is switched on or a reset is performed.

(a)The inputs/outputs are reset and initialized.

(b)The data memories are initialized (the bit devices are turned off and the word devices are cleared to 0).

(c)Self-diagnostic checks are made on the built-in PLC function parameter setting, operation circuit, etc.

REMARKS

The built-in PLC function parameters can be confirmed from GX Developer. (Refer to the GX Developer Operating Manual.)

(2)Sequence program operation processing

The sequence program written to the built-in PLC function is executed from step 0 to an END instruction.

(3)END processing

Post-processing for terminating one sequence program operation processing and return the sequence program execution to step 0.

(a)Self-diagnostic checks are performed.

(b)The present values of the timers are updated and their contacts are turned on/off, and the present values of the counters are updated and their contacts are turned on.

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Mitsubishi Electronics 700 Series, FR-A700 specifications Overview, Outline of Operation Processings