Logging Read Function - Mitsubishi Electric MELSEC iQ-R User Manual

Logging read function

More than 90000 points of logging data can be stored by transferring the device data to the file register of the CPU module
without stopping logging. This function reduces the takt time in a test demanding high-speed sampling.
Overview of the logging read function
After logging starts, an interrupt request is sent to the CPU module and an interrupt program is executed every time data is
logged for the preset number of logging read points.
The A/D converter module has 16 points of interrupt factors (SI) corresponding to the logging reading of each channel.
Setting interrupt pointers
Assign the interrupt factors (SI) of the A/D converter module and interrupt pointers of the CPU module in the interrupt pointer
setting of the engineering tool.
The interrupt function must be set when the logging read function is used.
Starting the logging read function
To use the logging read function, set 'CH1 Loading interrupt enable/disable setting' (Un\G546) to Enable (0) and set the
number of logging points to generate an interrupt in 'CH1 Logging read points setting value' (Un\G547). This function starts
when 'Operating condition setting request' (Y9) is turned on and off.
■The number of logging read points
Set a value that satisfies the following condition in 'CH1 Logging read points setting value' (Un\G547). (The following N shows
an integer value.)
• 'CH1 Logging data points setting' (Un\G536) = 'CH1 Logging read points setting value' (Un\G547)  N
When the condition above is not satisfied, the set value is regarded as the value closest to 'CH1 Logging read points setting
value' (Un\G547) (but smaller than 'CH1 Logging read points setting value' (Un\G547)) among divisors of the setting value of
'CH1 Logging data points setting' (Un\G536).
Ex.
Relation of the number of logging read points when 'CH1 Logging data points setting' (Un\G536) is set to 800 (80000 points)
Logging read points setting value
10 (1000 points)
9 (900 points)
11 (1100 points)
65 (6500 points)
600 (60000 points)
Actual number of logging read points
1000 points
800 points
1000 points
5000 points
40000 points
Logging read points monitor value
1000
800
1000
5000
40000
1 FUNCTIONS
1.14 Normal Logging Function
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