Fixed Cycle Processing Function - Mitsubishi Electric MELSEC iQ-R C R12CCPU-V User Manual

4.6

Fixed Cycle Processing Function

This function refreshes with a network module and performs data communication with an external device.
The following processes are performed with the fixed cycle processing function.
• Refresh processing with network modules (link refresh)
• Reset processing of watchdog timer
• Self-diagnostics processing
Setting a fixed cycle processing interval
The following shows the setting method for the cycle that the fixed cycle processing function operates.
[CPU Parameter]  [Operation Related Setting]  [Refresh Cycle Setting]
Window
Displayed items
Item
Refresh Cycle
Set the value that satisfies the following relational expression for the cycle of the fixed cycle processing. An
error will occur when the following expression is not satisfied.
• Setting time of the program monitoring function (WDT) > Cycle of the fixed cycle processing
Checking the interval
The following shows the method to check the interval (maximum value/minimum value/current value) at which the fixed cycle
processing function operates.
Checking with a function
The interval can be acquired using the C Controller module dedicated function (CCPU_GetConstantProcessStatus).
Checking with special registers
The interval at which the function operates is stored in special registers (SD520/SD522/SD524). (Page 213 Special
Register List)
Description
Set the interval that the fixed cycle processing function operates.
Setting range Default
1 to 2000 ms (1 ms 100 ms
units)
4 BASIC FUNCTIONS
4.6 Fixed Cycle Processing Function
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