Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 72

■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.
Stored value of a buffer memory
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).
1 FX5-4AD
70
1.4 Functions
Controlled by the analog input module
OFF(0)
Unestablished
'CH1 Number of logging data' (Un\G436)  10000 points
area to be monitored
Logging cycle
Conversion Conversion
cycle cycle
A trigger
occurs
ON(1)
Established
A hold trigger occurs
The logging is held
'CH1 Logging
points after trigger'
(Un\G539)
(1)
Data are collected.
Data are collected.
Time