Plc Processing Program Level And Operation - Mitsubishi Electric M800VW Series Programming Manual

M800V/M80V Series PLC Programming Manual (1/2)
2 PLC Processing Program

2.3 PLC Processing Program Level and Operation

2.3 PLC Processing Program Level and Operation
The user PLC processing works following the lebel shown below.
[PLC processing level]
Program name
Initial processing program
High-speed processing program
Main processing program
Additionally, the execution order in each processing unit is executed by the project unit order. The execution order of project is
executed in the order that is set by the user. They are not executed simultaneously. The order is determined on the multi-
project parameter setting screen on the built-in PLC (built-in edit function). It is not possible to set the order with GX
Developer/GX Works2.
When the execution order of the project is not specified, the project will be executed sequentially from 1.
[Image of PLC processing execution unit]
High-speed processing
Standard
interruption
Processing priority high
This program starts only once at power ON.
When this program operates, machine input and operation board input are not read.
This program starts periodically at each standard interrupt signal.
This program has the highest level as a program that starts periodically.
It is used in signal processing where high-speed processing is required.
The steps for high-speed processing program should be up to 1000 steps with basic instructions.
(Application example) Position count control of turret and ATC magazine
<Note>
 The standard interrupt signal cycle differs according to each model, and must be confirmed sepa-
rately.
This program runs constantly except during the high-speed process program.
When the user PLC one-scan process is completed, the next scan process starts at the next refer-
ence interrupt signal cycle.
program
Next standard
Project 1 interruption after 1
scan completion
Project 2
Project 3
7
Description (frequency, level, etc.)
Main processing
program
Project 1
Project 2
Project 3
Processing priority low
*The execution order of project changes
depending on the parameter.
1 scan
IB-1501667-B