447
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
16 External FX Device – FNC 80 to FNC 89
16.6 FNC 87 – RS2 / Serial Communication 2
11
FN
C30-
FN
C39
R
o
ta
tion and
Sh
ift
12
FNC
4
0
-FNC49
D
a
ta
Op
e
ra
tio
n
13
FNC5
0
-FNC5
9
H
igh Speed
Pr
ocessi
ng
14
FM
C6
0
-F
NC6
9
H
and
y
In
st
ru
cti
o
n
15
FNC7
0
-FNC7
9
Ex
te
rn
a
l F
X
I
/O
D
evi
ce
16
FNC8
0
-FNC8
9
Ext
e
rnal
FX
D
evi
ce
17
F
N
C1
00
-F
NC
10
9
Da
ta
Tr
ansf
e
r 2
18
FN
C
110-FN
C
13
9
Fl
oat
ing P
o
in
t
19
FN
C
140-FN
C
149
Da
ta
O
per
at
io
n
2
20
FN
C
15
0-F
N
C
159
P
o
si
tioni
ng
C
ont
ro
l
16.6
FNC 87 – RS2 / Serial Communication 2
Outline
This instruction sends and receives data in no-protocol communication by way of serial ports in accordance
with RS-232C or RS-485 provided in the main unit.
1. Instruction format
2. Set data
3. Applicable devices
Explanation of function and operation
1. 16-bit operation (RS2)
This instruction sends and receives data in no-protocol communication by way of serial ports in accordance
with RS-232C or RS-485 provided in the main unit.
→
For detailed explanation, refer to the Data Communication Edition.
Operand type
Description
Data type
Head device of data registers storing data to be sent
16-bit binary or
character string
m
Number of bytes of data to be sent [setting range: 0 to 4,096]
16-bit binary
Head device of data registers storing received data when receiving is completed
16-bit binary or
character string
n
Number of bytes to be received [setting range: 0 to 4,096]
16-bit binary
n1
Used channel number [contents of setting: K1 = ch 1, K2 = ch 2]
16-bit binary
Oper-
and
Type
Bit Devices
Word Devices
Others
System User
Digit Specification
System User
Special
Unit
Index
Con-
stant
Real
Number
Charac-
ter String
Pointer
X Y M T C S D
.b KnX KnY KnM KnS
T
C
D
R U
\G
V
Z Modify K
H
E
"
"
P
3 3
3
m
3 3
3 3
3 3
3
n
3 3
3 3
n1
3 3
FNC 87
RS2
−
Mnemonic
Operation Condition
16-bit Instruction
11 steps
RS2
Mnemonic
Operation Condition
Continuous
Operation
32-bit Instruction
S
1
S
D
S
1
S
S
2
D
FNC 87
RS2
m
S
Command
input
D
n
n1