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2. PLC Processing Program
2.1 PLC Processing Program Level and Operation
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2. PLC Processing Program
2.1 PLC Processing Program Level and Operation
2.1.1 High-speed processing program and main processing program
Table 2.1-1 explains the contents of users PLC processing level and Fig. 2.1-1 shows the timing chart.
Table 2.1-1 PLC processing level
Program name Description (frequency, level, etc.)
High-speed processing
program
This program starts periodically with a time interval of 7.1ms.
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 150 steps.
Application example:
Position count control of turret and ATC magazine
Main processing
program (ladder)
This program runs constantly. When one ladder has been executed from
the head to END, the cycle starts again at the head.
7.1ms
High-speed
processing
Main processing
This section is used by the controller.
(Note 1)
(Note 1) The section from the END command to the next scan is done immediately as shown with
the X section. Note that the min. scan time will be 14.2ms.
Fig. 2.1-1 PLC processing program operation timing chart