Mitsubishi Electric R60AD8-G - Page 163

APPX
Appendix 3 Buffer Memory Areas
161
A
CH1 Head pointer
The buffer memory address of the oldest data in 'CH1 Logging data' (Un\G10000 to Un\G10999) can be checked with this
buffer memory area.
The offset value counted from 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.
•CH Head pointer
•CH Head pointer (in Q compatible mode)
Ex.
When the value of 'CH2 Head pointer' (Un\G634) is 550
• The value in 'CH1 Head pointer' (Un\G434) is fixed to 0 since the oldest data is stored in the start address of
'CH1 Logging data' (Un\G10000 to Un\G10999) while the data of the first 1000 points is being logged from
the beginning of the logging. On and after the 1001st data, 'CH1 Head pointer' (Un\G434) increases one by
one each time data is stored.
• When 'CH1 Logging hold request' (Un\G471) is turned on and off, 'CH1 Head pointer' (Un\G434) is cleared
to 0.
CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8 CH9 CH10 CH11 CH12 CH13 CH14 CH15 CH16
434 634 834 1034 1234 1434 1634 1834 2034 2234 2434 2634 2834 3034 3234 3434
CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8 CH9 CH10 CH11 CH12 CH13 CH14 CH15 CH16
1090 1091 1092 1093 1094 1095 1096 1097 
11550 = 11000 + 550
CH2 Logging data
Head pointer: 550
(offset value from Un\G11000)
Un\G11000
Un\G11549
Un\G11550
Un\G11999
The oldest data
The latest data