Overview; Overview Of Operation - Mitsubishi Electric A800 Programming Manual

Overview

3.1

Overview

3.1.1

Overview of operation

The following description is of the overview of processing performed after the inverter is turned ON and through to execution
of a sequence program.
PLC function processing can roughly be classified into the following three types.
Initial processing
Initial processing is pre-processing to execute sequence operations and is performed only once when the inverter is
turned ON or reset.
• Resets to initialize the input and output.
• Initializes the data memory (bit devices are turned OFF and word devices are set to 0).
• Performs self-diagnostic checks on such items as PLC function parameter settings and operation circuits.
NOTE
• PLC function can be checked via FR Configurator2 (Developer). (Refer to the Instruction Manual of FR Configurator2.)
Sequence program operation
Executes a sequence program written in the PLC function from step 0 through the END instruction.
END processing
End processing is post-processing to end operation processing of a sequence program once and return execution to step
0 in the sequence program.
• Performs a self-diagnostic check.
• Updates timers and counters to the present values and turns contacts on/off.
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Sequence program