Mitsubishi FX3U-485-BD User Manual

D-47
FX Series PLC User's Manual - Data Communication Edition
Computer Link
6 Control Procedures and Setting Methods
6.4 Basic Formats of Dedicated Protocol
A
Common Items
B
N:N Network
C
Parallel Link
D
Computer Link
E
Inverter Communication
F
Non-Protocol Communication (RS/RS2 Instruction)
G
Non-Protocol Communication (FX
2N
-232IF)
H
Programming Communication
I
Remote Maintenance
Apx.
Discontinued models
6.4.3 Contents of set items in each control procedure (protocol)
This subsection explains the contents of the data used in each control procedure.
1. Control codes
The table below shows control codes.
1) When the PLC receives ENQ or ACK, it initializes the transfer sequence and begins receiving.
2) When the PLC receives EOT or CL as shown below, it initializes the transfer sequence.
At this time, the PLC gives no response.
2. Station number
The station number indicates a number provided in each PLC to determine to which PLC the computer
accesses.
The station number is specified in hexadecimal.
• In FX Series PLCs, set the station number using parameters. The setting range is from 00H to 0FH.
• For the station number setting method in A Series PLCs, refer to the respective A Series PLC manual.
In FX
2(FX), FX2C and FX0N PLCs, set a value to D8121.
→ For details on the program, refer to Section 9.3.
Cautions on setting station numbers
1) Do not overlap station numbers. If the same number is set for two or more stations, the transfer data is
destroyed and normal communication is not possible.
2) It is not necessary to set consecutive station numbers as shown in the setting example above. Any station
numbers in the setting range (00H to 0FH) are applicable.
(Examples: Station numbers may be set arbitrarily. Some station numbers may be skipped.)
Signal name Code Description Signal name Code Description
STX 02H Start of Text LF 0AH Line Feed
ETX 03H End of Text CL 0CH Clear
EOT 04H End of Transmission CR 0DH Carriage Return
ENQ 05H Enquiry NAK 15H Negative Acknowledge
ACK 06H Acknowledge
For format 1 For format 4
Computer side
PLC side
C
L
or
E
O
T
Computer side
PLC side
C
L
or
E
O
T
C
R
C
R
L
F
L
F
Computer
485PC-IF
↑ 485 ADP
Station No. 0
(00H)
↑ 485 ADP
Station No. 1
(01H)
↑ 485 ADP
Station No. 2
(02H)
↑ 485 ADP
Station No. 15
(0FH)
FX
Series
FX
Series
FX
Series
FX
Series
M8002
MOV H0 D8121
Initial pulse

Mitsubishi FX3U-485-BD Specifications

General

Brand	Mitsubishi
Model	FX3U-485-BD
Category	Controller
Language	English