Processing Of Inputs And Outputs; Refresh Processing - Mitsubishi L02CPU User Manual

2.6

Processing of Inputs and Outputs

Access processing from the CPU module to the general-purpose I/O, I/O modules, and intelligent I/O modules is
collectively executed before program operation. (refresh processing) Note that I/O processing can be performed upon
execution of an instruction by using a direct access device in the program. (direct processing)
Compared to the refresh processing, data acquisition is faster in direct processing while more time is required for
processing of each instruction.
2.6.1

Refresh processing

(1) Outline of the processing
The following describes the details of the refresh processing.
(a) Input
Before starting a program operation, the ON/OFF data in the general-purpose module and input module are
collectively loaded to the General-purpose input/input module access area of the CPU module. When a
program is executed, the ON/OFF data in the input (X) device memory are used for operation.
(b) Output
The program operation result for output (Y) is output to the output (Y) device memory for every operation.
Before starting a program operation, the ON/OFF data in the output (Y) device memory are collectively output
to the general purpose output or output module.
The processing outline is described in the illustration on the following page.
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