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2.6
Processing of Inputs and Outputs
The CPU module can batch-access the general-purpose I/O
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.
*1
The general-purpose input is an input signal received by the general-purpose input function of the built-in I/O function.
The general-purpose output is an output signal sent by the general-purpose output function of the built-in I/O function.
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.
CHAPTER 2 APPLICATION OF PROGRAMMING
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, I/O modules, and intelligent function modules before
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