Mitsubishi Electric MELSEC iQ-R Series User Manual page 269

■Step No. specification
A trigger occurs when the specified condition is met immediately before the execution of the specified step.
Execution condition
Always
In the specified condition satisfied
In the specified condition not satisfied
On the rising edge of the specified
condition
On the falling edge of the specified
condition
Status just before
Execution
the execution of
Not
the specified step
execution
0
Program
Data sampling before trigger
If the specified step is contained between FOR and NEXT loop of instructions, only the first iteration of the
loop where the specified conditions are met is handled as a trigger.
Since the step number cannot be checked in the following programs, the step number cannot be specified.
• Program having multiple parts
• ST program
• FB program
• SFC program
When a step number in an interrupt program is specified, the trigger condition may not be met.
■When trigger instruction executed
A trigger occurs when the LOGTRG instruction is executed. ( MELSEC iQ-R Programming Manual (CPU Module
Instructions, Standard Functions/Function Blocks))
When the LOGTRG instruction is used in an interrupt program, the trigger condition may not be met.
Description
Executes the specified step regardless of the state immediately before the execution of it.
Executes the specified step if the state immediately before the execution is a running state.
Executes the specified step if the state immediately before the execution is not a running state.
Executes the specified step if the state changes from non-running to running immediately before the execution of it.
Executes the specified step if the state changes from running to non-running immediately before the execution of it.
(1)
Trigger occurrence
END 0 END
END processing END processing
Data sampling after trigger
Sampling
(1) The state changes from non-running to
0 END 0
END processing
20 DATA LOGGING FUNCTION
running immediately before the execution
of the specified step.
20.5 Logging Type
20
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