Mitsubishi Electric MELSEC iQ-R Series User Manual page 134

CH1 Latest pointer
The buffer memory address of the latest data in CH1 Logging data (Un\G10000 to Un\G10999) can be checked with this
buffer memory area.
The offset value at the start address of CH1 Logging data (Un\G10000 to Un\G10999) 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 Q compatible mode)
Ex.
When the value of CH2 Latest pointer (Un\G635) is 8549
Latest pointer: 549
(offset value from Un\G11000)
• '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 and off, 'CH1 Latest pointer' (Un\G435) is cleared
to 0.
CH1 Number of logging data
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 1000, 'CH1 Number of logging data' (Un\G436) is fixed to 1000 since
the value is overwritten from the head again.
For details on the logging function, refer to the following.
Page 40 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 Q compatible
mode)
When 'CH1 Logging hold request' (Un\G471) is turned on and off, 'CH1 Number of logging data' (Un\G436) is
cleared to 0.
APPX
132
Appendix 3 Buffer Memory Areas
CH1 CH2
435 635
1098 1099
CH2 Logging data
Un\G11000
Un\G11549
11549 = 11000 + 549
Un\G11550
Un\G11999
CH1 CH2
436 636
1106 1107
CH3 CH4 CH5
835 1035 1235
1100 1101 1102
The latest data
The oldest data
CH3 CH4 CH5
836 1036 1236
1108 1109 1110
CH6 CH7 CH8
1435 1635 1835
1103 1104 1105
CH6 CH7 CH8
1436 1636 1836
1111 1112 1113