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3.
SPEclFlcATloNs
/MELSEC
3.7 Buffer Memory
The AD51 uses a buffer memory for data communication with the
PC CPU. (The buffer memory is not battery backed.)
(1) Buffer memory
(3K words). See the
memory map in Section 3.5 (page 3-13).
(2) Buffer memory
d
(3) The buffer memory is accessed by the AD51 using system sub-
routines (SR2, SW2). For details, refer t o Section 7.2.1 (page
7-61.
(4) The buffer memory
is accessed by the PC CPU using the FROM
and TO application instructions. For read and write procedures,
refer t o Section 7.2.2 (page 7-7). For details of the FROMITO
instructions, refer t o the A l , A2, A3CPU Programming Manual.
Address
Buffer memory area
' F l
B F D H
BFEH
BFFH
a
2
bytes
4
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