Friday 27 January 2017
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 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:
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
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| Tag Addressing Parameters |
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