Luka0204

Modbus TCP/IP iQ-R series

4 posts in this topic

Hi,

I have R04CPU (iQ-R series) on one side and on the other side is QJ71MT91 (modbus tcp/ip module). Is it possible to make communication between them (QJ71MT91 is master and R04CPU is slave)? iQ-R series doesn't have Modbus TCP/IP module, but is it possible to set modbus tcp/ip on built-in ethernet port of R04CPU, and how?

Best regards

Luka

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You would have to do it vice versa. The RCPU will be the client/master and the QJ71MT91 will be the server/Slave.

You can use the pre-defined protocol to send requests via the buiklt in ethernet port to the QJ71MT91 module.

 

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As Gambit states, it's not possible to use ModbusTCP Server (slave) in the R-CPU as of now. But if you must have it the way you are describing it (Q = Client/Master and R = Server/Slave), then you have to add some components in order to communicate between them. I would do the following if you "must" do it your way:

  1. If you already purchased the R-CPU, then also order an Ethernet card RJ71EN71. Alternatively if you haven't purchased the CPU yet, just replace R04 with R04EN (which has 2 built-in extra Ethernet port that can be configured with CCLinkIE Field.
  2. Buy a Modbus Server (slave) <-> CCLinkIE Field gateway to convert between Modbus telegrams and CCLinkIE Field network;
    https://www.anybus.com/products/gateway-index/anybus-xgateway/detail/anybus-x-gateway-cc-link-ie-field-slave---modbus-tcp-server

Hopefully you haven't purchased the CPU yet, since you can just select the R04EN CPU with 2 extra built-in Ethernet ports which can be configured as CCLinkIE Field ports (or regular Ethernet ports).

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Thanks for your answers.

I already have QJ71MT91 acting as a Master (to another PLC) and I am going to set QJ71MT91 also as a slave (if I am correct, QJ71MT91 can be a master and a slave at the same time). Then I will set built-in eth port on R04CPU to act as a Modbus TCP/IP master and hopefully that will work.

Regards

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