Справочник Пользователя для Mitsubishi Electronics QnUCPU
CHAPTER1 OVERVIEW
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CHAPTER1 OVERVIEW
The CPU module performs sequence control by executing programs.
This chapter describes the processing order in the CPU module, locations where the created programs are stored, and
devices and instructions useful for programming.
This chapter describes the processing order in the CPU module, locations where the created programs are stored, and
devices and instructions useful for programming.
1.1 Processing Order in the CPU Module
The CPU module performs processing in the following order.
(1) Initial processing (
The CPU module performs preprocessing required for program operations.
The preprocessing is performed only once when the module is powered on or reset.
The preprocessing is performed only once when the module is powered on or reset.
(2) Refresh processing with input and output modules (
The CPU module takes on/off data from the input module or intelligent function module and outputs on/off data to
the output module or intelligent function module.
the output module or intelligent function module.
(3) Program operation processing (
The CPU module sequentially executes the program stored in the module from the step 0 to the END or FEND
instruction.
instruction.
(4) END processing (
The CPU module performs refresh processing with network modules or communicates with external devices.
Figure 1.1 Processing order in the CPU module
Power-on or reset
Initial processing
Refresh processing with
input/output modules
Program operation processing
END processing
Scan time