435
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
16 External FX Device – FNC 80 to FNC 89
16.1 FNC 80 – RS / Serial Communication
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
Related devices
→
For detailed explanation, refer to the Communication Control Manual.
*1.
Cleared in the following cases:
•
When the PLC mode is changed from RUN to STOP
•
When RS instruction is not driven
*2.
Latched (battery backed).
*3.
Cleared when the PLC mode is changed from RUN to STOP.
System configuration
For using this instruction, it is necessary to attach either product shown in the table below to the main unit.
→
For the system configuration, refer to the Hardware Manual of the used PLC.
→
For detailed explanation, refer to the Communication Control Manual.
Differences between RS (FNC 80) instruction and RS2 (FNC 87) instruction
Cautions
→
For other cautions, refer to the Communication Control Manual.
• RS (FNC 80) instruction can be used for the ch1 (, but cannot be used for the ch2).
• Do not drive two or more RS (FNC 80) and/or RS2 (FNC 87) instructions for a same port at the same time.
• It is not permitted to use RS (FNC 80)/RS2 (FNC 87) instruction and IVCK (FNC270)/IVDR (FNC271)/
IVRD (FNC272)/IVWR (FNC273)/IVBWR (FNC274) instruction for the same port.
Device
Name
Device
Name
M8063
Serial communication error 1
D8120
*2
Communication format setting
M8121
*1
Sending wait flag
D8122
*3
Remaining number of data to be sent
M8122
*1
Sending request
D8123
*3
Monitor for number of received data
M8123
*1
Receiving complete flag
D8124
Header
M8124
Carrier detection flag
D8125
Terminator
M8129
Timeout evaluation flag
D8129
*2
Timeout time setting
M8161
*3
8-bit processing mode
D8063
Error code number of serial communication error 1
D8405
Communication parameter display
D8419
Operation mode display
Communication type
Option
RS-232C communication
FX
3U
-232-BD or FX
3U
-232ADP (with FX
3U
-CNV-BD)
RS-485 communication
FX
3U
-485-BD or FX
3U
-485ADP (with FX
3U
-CNV-BD)
Item
RS2
instruction
RS
instruction
Remarks
Header size
1 to 4 characters (bytes)
Up to 1 character
(byte)
In RS2 instruction, up to 4 characters (bytes)
can be specified as a header or terminator.
Terminator size
1 to 4 characters (bytes)
Up to 1 character
(byte)
Attachment of check
sum
The check sum can be
automatically attached.
The check sum should
be attached by a user
program.
In RS2 instruction, the check sum can be
automatically attached to the sent and
received data.
In this case, however, make sure to use a
terminator in the communication frame to be
sent and received.
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