Mitsubishi MELSEC iQ-F, User Manual

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4 FUNCTIONS
4.13 Logging Function
Stopping the Logging Operation
Logging operation stops (holds) when the preset trigger condition is satisfied and the set points of the data are collected.
A trigger that is generated when the condition is satisfied is called a hold trigger.
To generate a hold trigger, the following two methods are available.

Page 67 Logging hold request

Page 68 Level trigger
When a hold trigger is detected during data collection, the logging operation stops after the points of the data set in 'CH1 Post-
trigger logging points' (Un\G539) are collected.
Post-trigger logging points
Set the number of data collected in the period from the detection of a hold trigger to logging operation stop to 'CH1 Post-
trigger logging points' (Un\G539).
Checking that the logging has stopped
Check that 'CH1 Logging hold flag' (Un\G409) is ON (1).
Checking data when a hold trigger has occurred
The storage location of the data when a hold trigger has occurred can be checked with 'CH1 Trigger pointer' (Un\G437). The
offset value counted from the start address of CH1 Logging data (Un\G10000 to Un\G19999) is stored in 'CH1 Trigger pointer'
(Un\G437).
Ex.
The value stored in Trigger pointer when the logging operation stops under the following conditions
• 'CH1 Post-trigger logging points' (Un\G539): 655 points
• The data location where a hold trigger has occurred: 9350th data
ON
ON
OFF
OFF
OFF
ON
'CH1 Logging enable/disable
setting' (Un\G535)
'Operating condition setting
request' (Un\G70, b9)
'Operating condition setting
completed flag' (Un\G69, b9)
Enable (0)
Hold trigger
Logging hold flag
The data corresponding to
the points set in 'CH1 Post-trigger
logging points' (Un\G539) is
collected.
CH1 Latest pointer = 4
CH1 Head pointer = 5
CH1 Trigger pointer = 9350
the latest
the oldest
Address 0
Address 1
Address 2
Address 3
Address 4
Address 5
Address 9998
Address 9999
Address 9349
Address 9350
Address 9351