2. INSTRUCTIONS
2 − 21
MELSEC-A
(5) FIFO instructions
Table 2.21 FIFO Instructions
Classi-
fication
Unit
Instruction
Symbol
Symbol Contents of Processing
Execu-
tion Con-
dition
Number
of steps
Index
Subset
Applicable CPU Page
FIFW
7
●
!
7-60
Write
FIFWP
7
●
!
7-60
FIFR
7
●
!
7-60
Read
16 bits
FIFRP
7
●
!
7-60
(6) Buffer memory Access instructions
Table 2.22 Buffer Memory Access Instruction (Continue)
Classi-
fication
Unit
Instruction
Symbol
Symbol Contents of Processing
Execu-
tion Con-
dition
Number
of steps
Index
Subset
Applicable CPU Page
FROM
9
●
Not applicable to A2C and A52G. 7-65
1 word
FROMP
9
●
Not applicable to A2C and A52G. 7-65
DFRO
9
●
Not applicable to A2C and A52G. 7-65
Date
read
2 words
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 word
TOP
9
●
Not applicable to A2C and A52G. 7-68
DTO
11
●
Not applicable to A2C and A52G. 7-68
Date
write
2 words
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 word
FROMP
9
●
Dedicated to A2C and A52G. 7-71
DFRO
9
●
Dedicated to A2C and A52G. 7-71
Data
read
2 words
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
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