7 Applied Instructions
7.9 External Device (optional device)
425
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
System configuration
In order to use this instruction, you must install any one of the following products in the basic unit.
→ As for the system configuration, refer to the hardware manual of the corresponding
PLC main unit.
→ As for the detailed explanation, refer to the communication control manual.
*1. Required to use ch0 (standard built-in RS-422 port) in FX
3G PLCs.
Difference between RS instruction and RS2 instruction
Function change by version
Cautions
→ As for other cautions, refer to the communication control manual.
1) With RS, RS2 instructions, do not drive the same port simultaneously by plural instructions.
2) You cannot use RS, RS2 instructions, and IVCK, IVDR, IVRD, IVWR, IVBWR instructions on the same
port.
3) When using the header or terminator, please set the data of the header or terminator in the special D
before driving the RS2 instruction. Do not change the values of the header or terminator during driving of
RS2 instruction.
PLC
Type of
communication
Option
FX3U,
FX3UC-32MT-LT(-2)
RS-232C
communication
FX3U-232-BD or FX3U-232ADP(-MB)
RS-485
communication
FX3U-485-BD or FX3U-485ADP(-MB)
FX3UC(D, DSS)
RS-232C
communication
FX3U-232ADP(-MB)
RS-485
communication
FX3U-485ADP(-MB)
FX3G
RS-232C
communication
FX3G-232-BD or FX3U-232ADP(-MB) (FX3G-CNV-ADP is needed)
RS-232C/RS-422 converter
*1
(FX-232AW, FX-232AWC, FX-232AWC-H)
RS-485
communication
FX3G-485-BD or FX3U-485ADP(-MB) (FX3G-CNV-ADP is needed)
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.
Corresponding version
Item Outline of function
FX3G FX3U FX3UC
Ver. 1.00
or later
Ver. 2.30
or later
Ver. 2.30
or later
ch1
Data set ready (DSR) flag
When DR (DSR) signal of ch1 is ON, special device
M8405 is turned ON.
ch2
Data set ready (DSR) flag
When DR (DSR) signal of ch2 is ON, special device
M8425 is turned ON.
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