Mitsubishi MELSEC Q series User Manual page 62

• Step No. specification
A trigger occurs when the specified condition is met immediately before execution of the specified step. In
addition to "Step No.", set "Program name" and "Execution condition". Select an execution condition from
the following.
Always
When the specified condition is ON
When the specified condition is OFF
When the specified condition rises
When the specified condition falls
Ex. When the specified condition rises
Specified step
● A trigger occurs when the status immediately before execution of the specified step changes to the specified status.
● With the High-speed Universal model QCPU and Universal model Process CPU, a trigger occurs only when the specified
conditions are satisfied for the first time if the step between the FOR and NEXT instructions is specified.
(b) When trigger instruction executed
A trigger occurs when an instruction is executed. For instructions used for data logging, refer to  Page 170,
CHAPTER 11.
(c) When data logging trigger activated
A trigger occurs when the special relay (Data logging trigger) is turned on. For the list of the special relay and
special register used for data logging, refer to  Page 178, CHAPTER 12.
60
Item
Changed from Not Executed to Executed
Executed
Not
executed
Program 0 END
END processing
Data sampling before trigger
Any time regardless of the operation status immediately before the execution of the
specified step
The operation status immediately before the execution of the specified step is the
Executed state.
The operation status immediately before the execution of the specified step is the Not
Executed state.
The operation status immediately before the execution of the specified step has
changed from Not Executed to Executed.
The operation status immediately before the execution of the specified step has
changed from Executed to Not Executed.
Trigger
0 END 0
END processing
Data sampling after trigger
Sampling
Description
END 0
END processing