Mitsubishi Electronics FX3G User Manual

FX

3S

/FX

3G

/FX

3GC

/FX

3U

/FX

3UC

 Series

Programming Manual - Basic & Applied Instruction Edition

16 External FX Device – FNC 80 to FNC 89

FN
C30
-FN
C3

9

R

ota

tion and 

Shi
ft

FN
C40-FN

C49

D

ata O
perati

on

FNC

50-FNC

59

High-Speed

 

Proc

essing

FM
C60-FN

C69

H

andy 

In

struction

FN
C70-FN

C79

E

xternal

 F

X

 I/O
 

De

vice

FNC

80-FNC

89

External

 FX 

Dev
ice

FNC1
00-
FNC10

9

Dat
a 

Transfer 2

FNC1

10-
FNC139

Fl

oati

ng Poi

nt

FNC14

0-F

N

C

149

Da

ta

 

Operation 2

FNC1

50-
FNC159

Pos
itioning 

Control

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

*1.

Cleared when PLC power supply is turned from OFF to ON (in FX

3S

, FX

3G

, FX

3GC

, FX

3U

 and FX

3UC

 PLCs).

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

• The RS (FNC 80) instruction can be used for ch1 only (cannot be used for ch0/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) to IVMC (FNC275)", 

"ADPRW (FNC276)", "FLCRT (FNC300) to FLSTRD (FNC305)" instruction for the same port.

M8063

*1

Serial communication error 1

D8063

*1

Error code number of serial communication error

M8121

*2

Sending wait flag

D8120

*3

Communication format setting

M8122

*2

Sending request

D8122

*4

Remaining amount of data to be sent

M8123

*2

Receiving complete flag

D8123

*4

Amount of data already received

M8124

Carrier detection flag

D8124

Header

M8129

Time-out check flag

D8125

Terminator

M8161

*4

8-bit processing mode

D8129

*3

Time-out time setting

D8405

Communication parameter display

D8419

Operation mode display

FX

3S

RS-232C communication

FX

3G

-232-BD or FX

3U

-232ADP(-MB) (with FX

3S

-CNV-ADP)

RS-485 communication

FX

3G

-485-BD(-RJ) or FX

3U

-485ADP(-MB) (with FX

3S

-CNV-ADP)

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(-RJ) or FX

3U

-485ADP(-MB) (with FX

3G

-CNV-ADP)

FX

3GC

,

FX

3UC

(D,DS,DSS)

RS-232C communication

FX

3U

-232ADP(-MB) 

RS-485 communication

FX

3U

-485ADP(-MB) 

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)

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.

Used channel number

ch0, ch1, ch2

ch1

For the RS2 instruction:
Ch0 is available only in FX

3G

/FX

3GC

 PLCs.

Ch2 is not available in FX

3G

 PLC (14-point and

24-point type) and FX

3S

 PLC.