Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 75

Ex.
The values to be stored in each pointer at every detection interrupt when the logging read detection starts with 'CH1 Logging
load points setting value' (Un\G545) being set to 1000
Occurrence of read Previous logging read
pointer detection pointer
interrupts
Default value -1
1st time -1
2nd time 0
3rd time 1000
 
10th time 8000
11th time 9000
12th time 0
■Operation
The logging read function starts by setting interrupt pointers and turning offonoff 'Operating condition setting request'
(Un\G70, b9). 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.
• A/D conversion enable: CH1
• Logging load points setting value: 1000 points
'CH1 Latest pointer' (Un\G435)
'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 1st interrupt processing occurs
(2) The timing that the 2nd interrupt processing occurs
(3) The timing that the 3rd interrupt processing occurs
Current logging read
pointer
-1
0
1000
2000

9000
0
1000
0 0 999
-1
Logging Data Data
stored stored
stopped
0
0
Normal control program
(1)
Latest pointer
0
999
1999
2999

9999
999
1999
1000 1999 2000
0 1000
Data Data Data
stored stored stored
1 0 1
1 0
Normal control
program
Interrupt Interrupt
program program
(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.
Buffer memory areas
1st data

1000th data
1001st data

2000th data
2001st data

10000th data
2999 3000
2000
Data Data
stored stored
0
1 0
Normal control
program
Interrupt
program
(3)
1 FX5-4AD
1.4 Functions
1
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