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6
BUFFER MEMORY
6.24
CH1 Oldest Pointer (Un\G120)
In the logging data storage area, an address of buffer memory storing the oldest data can
be checked. (Refer to Section 4.2.7 (4).)
For information on the buffer memory for CH2 or later, refer to Section 6.1 (1).
(1) Stored data
The difference between the numeric value of the address storing the oldest data and
the numeric value of the start address in the logging data storage area is stored.
[Storage example] When the value to be stored into CH2 Oldest pointer (Un\G320) is
Latest data
Figure 6.8 Status of CH2 Logging data storage area (Un\G15000 to Un\G24999)
POINT
8551:
CH2 Logging data storage area
Un\G15000
Un\G23550
Un\G23551
Un\G24999
(1) The value of the oldest pointer is fixed to 0 because the oldest data is stored
into the beginning of the logging data storage area while logging data from the
start area to 10000th area.
(2) After the 10000th area, CH1 Oldest pointer (Un\G120) moves to the next area
whenever new data are stored (The numeric value 1 increases every time.)
Oldest data
23551 = 15000 + 8551
6.24 CH1 Oldest Pointer (Un\G120)
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