NgoHoang

MELSEC Communication

8 posts in this topic

Dear!

Could you tell me how send data from PLC Mitsu Q03UDV CPU to another Q03UDV CPU use MELSEC Communication Protocol with Ethernet built-in port?

- Config for 2 CPU as picture below  (use same Port) is correct or not? Need to config more parameter?

- Which command I can you to send a data?

- Melsec Communication Protocol send and receive at the same time, right?

Thanks and best regard!

If you have 1 sample program (simple) or a topic about this, please send it to me.

Capture.JPG

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Posted (edited)

 

Dear All!

Can you help me review my software below 2 program of 2 PLC Q-Series:

When I On bit M1000 to Open Port of another PLC, M1003 (Error flag) is set.

I don't know why, Could you tell me that reason?

Sorry, because I'm new one but the job is very urgent. Tomorrow, I use MC Protocol but can not run. These are program for Socket TCP.

Thanks and best regard!
@kaare_t

TCP_CPU1.gxw

TCP_CPU2.gxw

Edited by NgoHoang

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I have attached a program I used to send data between 2 Q series over Ethernet. Take a look as see if that helps. 

 

EthernetLink.gxw

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Thanks alot for your reply @WattUp!

Could you tell me, command GP.READ and GP.WRITE is use for MC Protocol, right?

Because I see in the Ethernet Built-In CPU, you define MC Protocol and in Network Parameter, you define another network. Can you help me explain about this.

Thanks and best regard!

Sorry for the question because I studying about this network.

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Posted (edited)

This program is using an EJ71 Ethernet card to handle the communication. When I did this using the built-in ports I had issues with Ethernet timeouts.

 

My Mits rep told me that the CPU prioritizes itself over networking and I have had no such issues since using the EJ71 so i guess I believe him. 

 

The built in port is talking to a GOT1000 via MC Protocol. That is why you see that there. 

Edited by WattUp
More info

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Thanks WattUp!

Your explain is very helpful for me.

If you have any project demo for MC Protocol to transfer data with 2 PLC, please send it to me. 

Thank you alot.

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Affer research some infomation, now I can communicate 2 PLC use TCP/IP and UDP/IP.

Thanks all.

But now, I don't know how to create this command (in the yellow circle)?

 

Capture.JPG

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hi , 

need to finish that command  I----------[ MCR   N0 ]-I

after that , that structure in yellow circle will created itself.(after download to plc)

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