Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 101

(1) Processing
(a) When two or more fixed scan execution type programs exist
Each fixed scan execution type program is executed at specified time intervals.
If two or more fixed scan execution type programs reach the specified time at the same timing, programs will be
executed in ascending order of the numbers set in the Program tab of the PLC parameter dialog box.
(b)
When both fixed scan execution type program and interrupt program exist
When a fixed scan execution type program and an interrupt program (I28 to I31) reach the specified time at the
same timing, the interrupt program will be given priority.
(c) When the execution condition is established during link refresh
The link refresh is suspended and a fixed scan execution type program is executed.
Even if the Block data assurance per station setting is enabled in the CC-Link IE or MELSECNET/H network,
this setting does not work when a device set as a refresh target is used in the fixed scan execution type
program.
In the fixed scan execution type program, do not use any refresh target device.
Interrupt factor
Fixed scan execution type
program execution
Link refresh execution
For the Block data assurance per station setting, refer to the following.
Manual for each network module
10ms 10ms
CHAPTER 2 APPLICATION OF PROGRAMMING
10ms 10ms
Link refresh is suspended and fixed scan
execution type program is executed.
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