Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 384

■Operation of a level trigger
To use a level trigger, set ON (1) to 'CH1 Logging hold request' (Un\G471) in advance. At the point where ON (1) has been set
to 'CH1 Logging hold request' (Un\G471), the module becomes the trigger condition wait status.
After the trigger condition has been satisfied, and the set points of the data have been collected from that point, the logging
stops.
'CH1 Logging hold request'
(Un\G471)
Trigger condition
established/unestablished
CH1 Logging data
(Un\G10000 to Un\G19999)
The data before the last 10000 points
are discarded.
A level trigger is detected on the refreshing cycle of the digital output value or the digital operation value.
Therefore, the data when a hold trigger is generated may not be stored in CH1 Logging data (Un\G10000 to
Un\G19999) depending on the setting of the logging cycle. To store the data at the timing when a hold trigger
is generated in CH1 Logging data (Un\G10000 to Un\G19999), arrange related settings so that the conversion
cycle of the monitoring target value (a trigger data) and the logging cycle (actual logging cycle) have the same
time period.
Trigger setting
value
(1) The data at the timing when a trigger is generated is not stored in the buffer memory area.
• Checking that the logging has stopped
Check that 'CH1 Logging hold flag' (Un\G409) is ON (1).
3 FX5-8AD
382
3.4 Functions
Controlled by the multiple input module
OFF(0)
Unestablished
'CH1 Number of logging data' (Un\G436)  10000 points
Stored value of a device to be monitored
Logging cycle
Conversion Conversion
cycle cycle
A trigger is
generated.
ON(1)
Established
A hold trigger is generated.
'CH1 Post-trigger
logging points'
(Un\G539)
(1)
Data are collected.
Data are collected.
Time (t)
The logging is held.