Chapter 18 Fixed Cycle Processing Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

18
FIXED CYCLE PROCESSING FUNCTION
This function refreshes with a network module and performs data communication with an external device.
It is performed by the following processing order:
No. Processing

Refresh processing with a network module (link refresh)
 INFORMATION LED display processing

Judgment processing of I/O modules (Windows forced restart and Windows shutdown)
 Completion processing of dedicated instructions
Setting a cycle for fixed cycle processing
The following shows the setting method for the cycle that the fixed cycle processing function runs.
[CPU Parameter]  [Operation Related Setting]  [Refresh Cycle Setting]
Window
Displayed items
Item
Refresh Cycle
Precautions
■Link refresh time
Set a value that satisfies the following condition for a refresh cycle which is set by using this function.
• Total refresh time < Refresh cycle
For link refresh time for each network module, refer to the following:
Page 172 Link refresh time
■Fixed cycle processing other than link refresh
This function is performed at intervals of refresh cycle.
Increasing a value of refresh cycle according to link refresh time affects the fixed cycle processing other than link refresh.
Consider a refresh cycle when changing a value of link devices (input) or special relays.
The conditions of the following processing are judged in each refresh cycle.
• INFORMATION LED display processing
• Judgment processing of I/O modules (Windows forced restart and Windows shutdown)
When turning a device from OFF to ON to OFF in a shorter time than the set period of refresh cycle, a change in the device
value when the device is turned from OFF to ON may not be detected.
Description
Set the refresh cycle.
Setting range
1 to 2000 ms (1 ms
units)
18 FIXED CYCLE PROCESSING FUNCTION
18
Default
100 ms
181