7. APPLICATION INSTRUCTIONS
7
−
71
MELSEC-A
7.6.3 Remote terminal module 1- and
2-word data read
(FROM, PRC, FROMP, PRC,
DFRO, PRC, DFROP, PRC)
Available Device
Bit device
Word (16-bit) device
Constant
Pointer
Level
Ca
rr
y
fla
g
Err
o
r
fla
g
X Y M L S B F T C D W R A0
A1
Z V K H P I N
D
igit specification
*1
In
d
e
x
M9012 (M9010, M9011)
n1
O
O
FROM
n2
O
O
(D1)
O
O
O
O
O
DFRO
n3
O
O
O
O
(D2)
O
O
O
O
PRC
(D3)
O
*1: K1 to K4 when the FROM(P) instruction is used. K1 to K8 when the DFRO(P) instruction is used.
Functions
FROM , PRC
(1) Reads data of "n3" words which begin with the address specified at "n2" of
buffer memory in the remote terminal module specified at "n1", and stores the
data in the devices starting with the one specified at (D1).
AnS
AnN
AnSH
An A1FX
A3H
A3M
A3V AnA
AnU, A2AS
A2USH-S1
A2USH board
QCPU-A
(A Mode)
A0J2H
A2C
A52G
A73
A3N
board
Applicable
CPU
X X X X X X
X
X O X X
Remark
K1
to
K4
K1
to
K8
n3
n3
n1
A2C: Head station number of remote
terminal
module
A52G: (Head station number of remote
terminal module) + (100)
n2
Head address of data to be read
(D1)
Head number of the device which store
read data
n3
Number of data to be read
(D2)
Number of the device to be turned on at
read completion
(D3)
Dummy data which has no meaning in
program processing
Setting data
FROM, DFRO
Indicates the instruction symbol.
n1 (D1)
n1 (D1)
P
n2
n2
Read commands
(D3)
(D2)
PRC
(D3)
(D2)
PRC
Not required when the AJ35PTF-R2 RS232C interface unit is used. For details,
refer to AJ35PTF-R2 RS-232C interface unit user’s manual.
Remote terminal
buffer memory
CPU module
n2
Device specified at (D1)
n3 points
n3 words
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