Communication between Mitsubishi FX3U PLC and SCADA via RS485BD

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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