7 Applied Instructions
7.9 External Device (optional device)
403
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
1
Outline
2
Instruction List
3
Configuration of
Instruction
4
How to Read
Explanation of
Instructions
5
Basic Instruction
6
Step Ladder
Instructions
7
Applied
Instructions
8
Interrupt Function
and Pulse Catch
Function
A
Relationships
between devices
and addresses
Function and operation explanation
1. 16-bit operation (RS)
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 manual.
Related devices
→ For detailed explanation, refer to the Data Communication Edition manual.
*1. Not supported by the FX
0N PLC.
*2. FX
U, FX2C PLCs are applicable at Ver.3.30 or later.
*3. Not supported by the FX
1S, FX1N, FX2N, FX1NC, FX2NC, FXU, FX2C and FX0N PLCs.
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 RS instruction and RS2 instruction
RS2 instruction is not supported by the FX1S, FX1N, FX2N, FX1NC, FX2NC, FXU and FX0N PLCs.
Device Name Device Name
M8063 Serial communication error 1 D8120 Communication format setting
M8121 Sending wait flag D8122 Remaining number of data to be sent
M8122 Sending request D8123 Monitor for number of received data
M8123 Receiving complete flag D8124 Header
M8124
*1
Carrier detection flag D8125 Terminator
M8129
*2
Time-out check flag
D8129
*2
Time-out time setting
M8161 8-bit processing mode D8063 Error code number of serial communication error 1
D8405
*3
Communication parameter display
D8419
*3
Operation mode display
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 ch1 ch0, ch1, ch2
In RS2 instruction is as follows:
Ch2 is not available in 14-point and 24-point type FX3G
PLCs.
Ch0 is available only in FX3G PLCs.
Command input
RS
EN
s
m
ENO
d
n
Number of bytes
to be received
Head device storing
data to be sent
Number of bytes of
data to be sent
Head device storing
received data when
receiving is completed
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