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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
16 External FX Device – FNC 80 to FNC 89
16.1 FNC 80 – RS / Serial Communication
11
FNC30-FNC39
Rotation and
Shift
12
FNC40-FNC49
Data Operation
13
FNC50-FNC59
High-Speed
Processing
14
FMC60-FNC69
Handy
Instruction
15
FNC70-FNC79
External FX I/O
Device
16
FNC80-FNC89
External FX
Device
17
FNC100-FNC109
Data
Transfer 2
18
FNC110-FNC139
Floating Point
19
FNC140-FNC149
Data
Operation 2
20
FNC150-FNC159
Positioning
Control
Related devices
→ 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, FX3G, FX3GC, FX3U and FX3UC 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.
System configuration
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.
Differences between the RS (FNC 80) instruction and RS2 (FNC 87) instruction
Cautions
→ 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.
Device Name Device Name
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
PLC Communication type Option
FX3S
RS-232C communication FX3G-232-BD or FX3U-232ADP(-MB) (with FX3S-CNV-ADP)
RS-485 communication FX3G-485-BD(-RJ) or FX3U-485ADP(-MB) (with FX3S-CNV-ADP)
FX3G
RS-232C communication FX3G-232-BD or FX3U-232ADP(-MB) (with FX3G-CNV-ADP)
RS-485 communication FX3G-485-BD(-RJ) or FX3U-485ADP(-MB) (with FX3G-CNV-ADP)
FX3GC,
FX3UC(D,DS,DSS)
RS-232C communication FX3U-232ADP(-MB)
RS-485 communication FX3U-485ADP(-MB)
FX
3U,
FX3UC-32MT-LT(-2)
RS-232C communication FX
3U-232-BD or FX3U-232ADP(-MB) (with FX3U-CNV-BD)
RS-485 communication FX3U-485-BD or FX3U-485ADP(-MB) (with FX3U-CNV-BD)
Item
RS2 instruction
RS instruction Remarks
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 FX3G/FX3GC PLCs.
Ch2 is not available in FX
3G PLC (14-point and
24-point type) and FX
3S PLC.