Mitsubishi MELSEC-A series, Programming Manual

Page: 37 / 508

2. INSTRUCTIONS
2
−
21
MELSEC-A
(5) FIFO instructions
Table 2.21 FIFO Instructions
Classi-
fication Un
it
Instruction
Symbol
Symbol Contents of Processing
Execu-
tion Con-
dition
Nu
m
b
e
r
of steps
Inde
x
S
ubset
Applicable CPU Page
FIFW 7
●
!
7-60
Write
FIFWP 7
●
!
7-60
FIFR 7
●
!
7-60
Read
16 bi
ts
FIFRP 7
●
!
7-60
(6) Buffer memory Access instructions
Table 2.22 Buffer Memory Access Instruction (Continue)
Classi-
fication Un
it
Instruction
Symbol
Symbol Contents of Processing
Execu-
tion Con-
dition
Nu
m
b
e
r
of steps
Inde
x
S
ubset
Applicable CPU Page
FROM 9
●
Not applicable to A2C and A52G. 7-65
1 w
o
rd
FROMP 9
●
Not applicable to A2C and A52G. 7-65
DFRO 9
●
Not applicable to A2C and A52G. 7-65
Date
read
2 w
o
rds
DFROP
Reads data from the special
function module.
9
●
Not applicable to A2C and A52G. 7-65
TO 9
●
Not applicable to A2C and A52G. 7-68
1 w
o
rd
TOP 9
●
Not applicable to A2C and A52G. 7-68
DTO 11
●
Not applicable to A2C and A52G. 7-68
Date
write
2 w
o
rds
DTOP
Writes data to the special
function module.
11
●
Not applicable to A2C and A52G. 7-68
FROM 9
● 
Dedicated to A2C and A52G. 7-71
1 w
o
rd
FROMP 9
●

Dedicated to A2C and A52G. 7-71
DFRO 9
●

Dedicated to A2C and A52G. 7-71
Data
read
2 w
o
rds
DFROP
Reads data from remote
terminals.
9
● 
Dedicated to A2C and A52G. 7-71
*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.
*1
*1