Mitsubishi Electric MELSEC-L Series - Installation; CHAPTER 6 INSTALLATION AND WIRING

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CHAPTER 6 DATA LOGGING FUNCTION
6
6.3 Logging Type 6.3.3 Trigger condition
6.3.3 Trigger condition
Specify a trigger condition by selecting appropriate items from the following.
*1
*1 The following cases are not regarded as trigger conditions.
• When a trigger condition is met again after occurrence of the trigger
• When a trigger condition is met with no data sampling performed
*2 A trigger will also occur in a case other than program execution (link refresh, transient update, a device test conducted
from a peripheral device, etc.)
Setting item Description
Condition
specification
Condition change
specification
When the bit of the bit device
rises
A trigger occurs when the status of the specified device is changed
from off to on.
When the bit of the bit device
falls
A trigger occurs when the status of the specified device is changed
from off to on.
When the word device value
meets the specified value
A trigger occurs when the data that match the specified value are
written
*2
, regardless of the current value status of the specified
device (match or not match with the specified value).
When data are written to a
word device
A trigger occurs when data are written to the specified device.
Step No.
specification
Always
A trigger occurs any time regardless of the operation status of the
specified step.
When execution condition is
ON
A trigger occurs any time but only during operation execution of the
specified step.
When execution condition is
OFF
A trigger occurs only not during operation execution of the specified
step.
When execution condition
rises
A trigger occurs when the operation nonexecutable status of the
specified step is changed to the executable status.
When execution condition
falls
A trigger occurs when the operation executable status of the
specified step is changed to the nonexecutable status.
When trigger instruction executed
A trigger occurs when the trigger logging set instruction (LOGTRG)
is executed.
When data logging trigger activated
A trigger occurs when the special relay (Data logging trigger) is
turned on.