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Hi Friends, Here i want share with you a tutorial on how to establish Communication between Mitsubishi FX3U PLC and Elipse SCADA via RS485 BD 


The required Items for the setup is as follows


Sr. no.
Material
1
PLC Type : FX Series
2
CPU      : FX3U
3
Module   : FX3U RS485BD
4
SCADA Make : Elipse
5
SCADA Type : 20/300/ Unlimited Tags
6
Other





Figure Connection between PC(SCADA) & PLC(FX3U)


 The required cables are as follows

 

Sr. no.
Item
Description
1
Medoc cable
(MITSU-CAB2A)
Prog. cable for FX PLC
2
Converter Cables
*1
Comm. Cable for PC ,PLC &
Converter

 *1 To connect the SCADA to the controller the RS 232 to RS 485 Converter  is used. The Converter is having RS422/485 port for connecting to PLC & RS232 port on other side for connection to PC.



As the FX-485BD Port is used, PLC parameter settings are required on PLC side.
PLC Parameter Configuration for Channel1:
1. Baud Rate: 9600.
2. Data Bits: 7 bits
3. Parity : Even
4. Stop Bit: 1 bit
5. Sum Check: Yes
6. Transmission Control: Without CR, LF
7. H/W Type: RS485
8. Station No.: 01
PLC Communication Parameter Settings using GX Developer:

PLC Communication Parameter Settings using GX Developer

 SCADA Program settings



 SCADA Driver Details:

 

Driver
MELSEC-A.dll
Version
1.02
Latest Update
2004.10.20
Driver Help
Melsec-A_US.pdf

 

Driver Setting Parameters:
P1: 1 (Comm. Port)
P2: 3721(Comm. Parameters: 9600 bps, 7 data bits, Even
Parity & 1 stop bit)
P3: 300 (Timeout in milliseconds)
P4: 10 (For RS485)
Other needed Configuration is done through “Extra  Configuration “Dialog as follows:



• Snap shot of Driver Settings in Elipse SCADA software
 

Step 1: Enter the Driver Parameters P1-P4.



Driver Parameters
Step 2: Click on “Extra” button to edit settings.



 Step3: In “Extra” menu select “Protocol” option to edit Protocol  Settings.


“Protocol” option

 Tag Addressing Parameters:
 

The Tags are generated by using N1-N4 parameter settings as follows:
 

N1: Station Number (e.g.: 1)

N2: CPU Number (normally 255)

N3: Variable Type (e.g.: 14 for D Register)

N4: Variable Address (e.g.:10 for D10 Register)

Scan: User Defined
 

• Snap shot of Tag Addressing Parameters in Software
 
Tag Addressing Parameters

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