Mitsubishi Electric MELSEC iQ-R Series User Manual page 56

Ex.
The values to be stored in each pointer at every detection interrupt when the logging read detection starts with 'CH1 Logging
read points setting value' (Un\G545) being set to 1000
Occurrence of read pointer
detection interrupts
Default value
First time
Second time
Third time

10th time
11th time
12th time
Operation
The logging read function starts by setting interrupt pointers and turning on and off 'Operating condition setting request' (Y9).
This function repeats its operation every time the same number of data as the logging read points monitor value is logged.
Ex.
The following figure shows the operation when the logging read function is used under the following conditions.
• Conversion enabled channel: 1CH
• Logging read points setting value: 100 points
'CH1 Current logging read pointer'
(Un\G438)
Logging status
'Interrupt factor detection flag [n]'
(Un\G4 to Un\G19)
'Interrupt factor reset request [n]'
(Un\G156 to Un\G171)
CPU module
(scan execution type program)
CPU module (interrupt program)
(1) The timing that the first interrupt processing occurs
(2) The timing that the second interrupt processing occurs
(3) The timing that the third interrupt processing occurs
1 FUNCTIONS
54
1.10 Logging Function
Previous logging read pointer
-1
-1
0
100

800
900
0
0
Storing Storing
Logging stopped
data data
0
0
Normal control program
Current logging read pointer
-1
0
100
200

900
0
100
0
Storing Storing Storing
data data data
1 0
1 0
Normal control
program
Interrupt
program
(1) (2)
In response to a logging read interrupt,
the CPU module reads the logging data
corresponding to the set number of
logging read points from the logging
read start address.
Latest pointer
0
99
199
299

999
99
199
100 200
Storing Storing
data data
1 0
1 0
Normal control
program
Interrupt Interrupt
program program
(3)