Mitsubishi Electric MELSEC iQ-R Series User Manual page 47

• When a specified number of times is exceeded
The number of times the count condition is satisfied is counted from when the start condition has been satisfied to when the
terminal condition has been satisfied (count period).
During the count period, the conditions for the occurrence of a trigger are always judged. If the conditions are satisfied, a
trigger will occur immediately.
If trigger occurs once, the terminal condition is satisfied, and until the start condition is satisfied again, a trigger does not
occur.
When a terminal condition is satisfied and a start condition is satisfied again, the number of counts is reset and the next count
is started.
The start condition, terminal condition, and count condition determine the rise of conditions.
Ex.
Conditions for the occurrence of a trigger = Number of times the count condition is satisfied > 2
A trigger occurs when the number of times the count condition is satisfied three times.
Then, even if the count condition is satisfied, a trigger does not occur.
Wait for start condition to
be established
Trigger
True
Start
condition
False
True
Terminal
condition
False
Number of
counts
True
Count
condition False
■Order
A trigger occurs when the order is wrong (abnormal pattern is detected), when the order is correct (normal pattern is
detected), or when a timeout is detected by monitoring the order of multiple conditions satisfaction.
• Abnormal pattern is detected
After starting the monitoring of sequential order once the start condition is satisfied, patterns that are satisfied in such a order
which differs from the order of 1st condition, 2nd condition and 3rd condition, are detected.
A trigger occurs when the condition is satisfied in a order which differs from the specified order.
Trigger
True
Start
condition
False
True
1st
condition
False
True
2nd
condition
False
True
3rd
condition
False
Wait for start condition to
Count period
Occurrence
ª
1 2 3
Order monitoring period
Occurrence
be established
Since the 3rd condition holds true before the 2nd, the
trigger occurs and the order monitoring period ends.
1 FUNCTION
1.1 Data Logging Function
1
45