2. INSTRUCTIONS
2 − 22
MELSEC-A
Table 2.22 Buffer Memory Access Instructions
Classi-
fication
Unit
Instruction
Symbol
Symbol Contents of Processing
Execu-
tion Con-
dition
Number
of steps
Index
Subset
Applicable CPU Page
TO
9
●
Dedicated to A2C and A52G. 7-76
1 word
TOP
9
●
Dedicated to A2C and A52G. 7-76
DTO
11
●
Dedicated to A2C and A52G. 7-76
Date
write
2 words
DTOP
Writes data from remote
terminals.
11
●
Dedicated to A2C and A52G. 7-76
(7) FOR / NEXT instructions
Table 2.23 FOR / NEXT Instructions
Classi-
fication
Unit
Instruction
Symbol
Symbol Contents of Processing
Execu-
tion Con-
dition
Number
of steps
Index
Subset
Applicable CPU Page
FOR
3
!
7-88
Repeti-
tion
NEXT
Executes the program area between
FOR and NEXT “n”
times.
1
!
7-88
(8) Local, remote I/O station access instructions
Table 2.24 Local, Remote I/O Station Access Instructions
Classi-
fication
Unit
Instruction
Symbol
Symbol Contents of Processing
Execu-
tion Con-
dition
Number
of steps
Index
Subset
Applicable CPU Page
LRDP
Reads data from the local station.
11
●
!
7-91
Local
station
data
read,
write
LWTP
Writes data to the local station.
11
●
!
7-91
RERP
Reads data from the special
function module in the remote
I/O station.
11
●
Not applicable to A3V. 7-97
Remote
I/O
station
data
read,
write
1 word
RTOP
Writes data to the special function
module in the remote I/O station.
11
●
Not applicable to A3V. 7-97
*1: For the number of steps when extension devices are used or when index qualification is performed to
bit devices for AnA, A2AS, AnU, QCPU-A (A Mode) and A2USH board, refer to Section 3.8.1.
*2: The
mark in the Index column indicates that index qualification can be performed with the AnA,
A2AS, AnU, QCPU-A (A Mode) and A2USH board only.
*3: The
mark in the Subset column indicates that subset processing can be performed with the A3H,
A3M, AnA, A2AS, AnU, QCPU-A (A Mode) and A2USH board only.
*2
*1
*2
*3
*1
*1
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