11 DATA LOGGING FUNCTION
11.3 Logging Type
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11
■Step No. specification
A trigger occurs when the specified condition is met immediately before the execution of the specified step.
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.
Execution condition Description
Always Executes the specified step regardless of the state immediately before the execution of it.
In the specified condition satisfied Executes the specified step if the state immediately before the execution is a running state.
In the specified condition not satisfied Executes the specified step if the state immediately before the execution is not a running state.
On the rising edge of the specified
condition
Executes the specified step if the state changes from non-running to running immediately before the execution of it.
On the falling edge of the specified
condition
Executes the specified step if the state changes from running to non-running immediately before the execution of it.
(1) The state changes from non-running to
running immediately before the execution
of the specified step.
0 END 0 END 0 END 0
(1)
Execution
Not
execution
Program
Sampling
Trigger occurrence
END processing END processing END processing
Data sampling before trigger Data sampling after trigger
Status just before
the execution of
the specified step
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