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FX

3G

/FX

3U

/FX

3UC

 Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

16 External FX Device – FNC 80 to FNC 89

FN
C

30

-FN
C

39

R

otati
on and 

Shi
ft

FNC4
0-F

NC4

9

D

ata O
per
ati

on

FN
C

50-FN

C

59

H

igh S

pe

ed 

P

rocessing

FM
C

60-FN

C

69

H

andy 

In

st

ru

ct

ion

FNC7
0-F

NC7

9

Ex

ter

nal FX

 I/O

 

D

evice

FN
C

80-FN

C

89

Ext
ernal
 FX 

De
vic

e

FN

C

100-
FN

C

10

9

Da

ta

 

Transf
er 2

FN

C

110-
FN

C

139

Floati

ng Poi

nt

FN

C

14

0-F

N

C

149

Da

ta

 

O

per
at

ion 2

FN

C

150-
FN

C

159

Posit

ioning 

C

ont
ro

l

→ For detailed explanation, refer to the Data Communication Edition manual.

*1.

Cleared when the power is turned off and on (in FX

3G

, FX

3U

 and FX

3UC

 PLCs).

Cleared when the PLC mode is changed from STOP to RUN (in FX

3G

, FX

3U

 and FX

3UC

 PLCs).

*2.

Cleared in the following cases:
• When the PLC mode is changed from RUN to STOP
• When the RS instruction is not driven

*3.

Latched (battery or EEPROM backed).

*4.

Cleared when the PLC mode is changed from RUN to STOP.

To use this instruction, it is necessary to attach one of the products shown in the table below to the main unit.

→ For the system configuration, refer to the respective PLC Hardware Edition manual.

→ For detailed explanation, refer to the Data Communication Edition manual.

→ For other cautions, refer to the Data Communication Edition manual.

• RS (FNC 80) instruction can be used for ch1 only (cannot be used for ch2).
• Do not drive two or more RS (FNC 80) and/or RS2 (FNC 87) instructions for the same port at the same time.
• It is not permitted to use an RS (FNC 80)/RS2 (FNC 87) instruction and an IVCK (FNC270)/IVDR (FNC271)/IVRD 

(FNC272)/IVWR (FNC273)/IVBWR (FNC274)/FLCRT (FNC300)/FLDEL (FNC301)/FLWR (FNC302)/FLRD 
(FNC303)/FLCMD (FNC304)/FLSTRD (FNC305) instruction for the same port.

M8063

*1

Serial communication error 1

D8120

*3

Communication format setting

M8121

*2

Sending wait flag

D8122

*4

Remaining amount of data to be sent

M8122

*2

Sending request

D8123

*4

Amount of data already received

M8123

*2

Receiving complete flag

D8124

Header

M8124

Carrier detection flag

D8125

Terminator

M8129

Time-out check flag

D8129

*3

Time-out time setting

M8161

*4

8-bit processing mode

D8063

*1

Error code number of serial communication error 1

D8405

Communication parameter display

D8419

Operation mode display

FX

3U

,

FX

3UC

-32MT-LT(-2)

RS-232C communication

FX

3U

-232-BD or FX

3U

-232ADP(-MB) (with FX

3U

-CNV-BD)

RS-485 communication

FX

3U

-485-BD or FX

3U

-485ADP(-MB) (with FX

3U

-CNV-BD)

FX

3UC

(D,DSS)

RS-232C communication

FX

3U

-232ADP(-MB) 

RS-485 communication

FX

3U

-485ADP(-MB) 

FX

3G

RS-232C communication

FX

3G

-232-BD or FX

3U

-232ADP(-MB) (with FX

3G

-CNV-ADP)

RS-485 communication

FX

3G

-485-BD or FX

3U

-485ADP(-MB) (with FX

3G

-CNV-ADP)

Header size

1 to 4 characters (bytes)

Up to 1 character
(byte)

For the 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.

For the 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 with the communication frame to be
sent and received.