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2 MULTIPLE CPU SYSTEM
[Dummy setting]
Usually, the automatic refresh setting is executed between PLC CPU and Motion
CPU for the instructions to each Motion CPU and the monitor of a state by the
PLC CPU at the time of operation. However, the automatic refresh is not
necessary between each Motion CPU. In this case, because it is made not to
execute the automatic refresh setting between the Motion CPU using a dummy
setting, it is not necessary to use the user device for the automatic refresh vainly,
and a main cycle can also be shortened.
Example of the automatic refresh setting using the "Dummy setting" is as follows.
•
Motion CPU No.3
This part is not
refreshed so that
a dummy setting.
Motion CPU No.4
PLC CPU No.1
Motion CPU No.2
Read data of
CPU No.3
Read data of
CPU No.3
• PLC CPU (CPU No.1)
Automatic refresh setting 1
• Motion CPU (CPU No.3)
Automatic refresh setting 1
• Motion CPU (CPU No.2)
Automatic refresh setting 1
• Motion CPU (CPU No.4)
Automatic refresh setting 1
• The device of CPU No.2 is not refreshed by the CPU No.4.• The device of CPU No.4 is not refreshed by the CPU No.2.
• The device of CPU No.2 and No.4 are not refreshed by the CPU No.3.
Although the example of a setting is the case of the automatic refresh setting 1,
the automatic refresh setting 2 - 4 can be also set similarly.