Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 459

CH1 Latest pointer
The buffer memory address of the latest data in CH1 Logging data (Un\G10000 to Un\G19999) can be checked with this
buffer memory area.
The offset value at the start address of CH1 Logging data (Un\G10000 to Un\G19999) is stored.
■Buffer memory address
The following shows the buffer memory address of this area.
Buffer memory name
CH Latest pointer
CH Latest pointer (in FX2N allocation mode function)
Ex.
When the value of CH2 Latest pointer (Un\G635) is 20549
Latest pointer: 549
(offset value from Un\G20000)
• 'CH1 Latest pointer' (Un\G435) increases one by one each time data is stored from beginning of the logging.
• When 'CH1 Logging hold request' (Un\G471) is turned onoff, 'CH1 Latest pointer' (Un\G435) is cleared to
0.
CH1 Logging data points
The number of data stored in the logging data storage area can be checked during the logging.
'CH1 Number of logging data' (Un\G436) increases one by one each time data is stored from beginning of the logging.
When the value in the logging data storage area reaches 10000, 'CH1 Number of logging data points' (Un\G436) is fixed to
10000 since the value is overwritten from the head again.
For details on the logging function, refer to the following.
Page 371 Logging function
■Buffer memory address
The following shows the buffer memory address of this area.
Buffer memory name
CH Number of logging data
CH Number of logging data (in FX2N allocation mode
function)
When 'CH1 Logging hold request' (Un\G471) is turned onoff, 'CH1 Number of logging data' (Un\G436) is
cleared to 0.
CH1 CH2
435 635
9041 9042
CH2 Logging data
Un\G20000
The latest data
Un\G20549
20549 = 20000 + 549
Un\G20550
The oldest data
Un\G29999
CH1 CH2
436 636
9051 9052
CH3 CH4 CH5 CH6
835 1035 1235 1435
9043 9044 9045 9046
CH3 CH4 CH5 CH6
836 1036 1236 1436
9053 9054 9055 9056
Appendix 12 Buffer Memory Areas
CH7 CH8
1635 1835
9047 9048
A
CH7 CH8
1636 1836
9057 9058
APPX
457