PLC to PLC Communications

[frank.raymond 0]

Is this type of PLC comm possible and if so is there any sample code? Thanks

[scottmurphy 1]

Yes it possible, couldn't find any sample code, but is very easy to achieve. What processors are you using, this will define how easy it is.....

[frank.raymond 0]

CJ1 series. Thanks for the reply.

[gtsuport 61]

What are you trying to communicate between the plc's? Do you have the hardware, or just want to know what is possible?

[frank.raymond 0]

I have 5 plc's that I want to read/write data to each other. I know I can use control link but since this is not time critical data and I already have the ETN module's in place I figured what the heck. Learn something new.

[scottmurphy 1]

Bobb is an advocate for controllerlink, and is ideal, but can add extra hardware cost if it is not absolutely required. Depending on the quality/robustnest of the ethernet network, then ethernet should be sufficient. It is a good idea to have an 'automation' network, that the IT people cannot touch.

[Sleepy Wombat 27]

I'll just post the code... This will simply sen out data to all nodes into of 300 words into a designated memory area (a bit like controller link) simple as.

[Nibroc 4]

... Also see this previous post covering a similar topic (PLC to PLC communication). http://forums.mrplc.com/index.php?showtopic=7205&hl= Nibroc

[frank.raymond 0]

Nibroc, This is from the thread you posted: Some Notes: 1.You will need to map each of your ethernet units to the same network number using the routing table editor. (from CX-integrator) 2.Node number for each PLC will be the value of the last octet of the IP address. What is the difference of using CX-Programmer to set the ETN versus the CX-Integrator? I'm learning to use the FB's. Another question regarding the SendData and the SendCommand Does the SendCommand xmits and rcvs where the SendCommand just sends? Thanks for the info.

[Nibroc 4]

Raymond, None, the 'Routing Table Editor' was available via CX-Programmer in earlier versions, it is now available via 'CX-Integrator'. SendRecv.cxp

[frank.raymond 0]

Thanks for the reply. I talked with my vendor about the diferences between send & receive in both standard and FB instructions. He also indicated the send/receive is very much like the old Basic peek/poke instuctions. From this I reckon I'll be using the _CPU011_ReceiveData FB. Hey, again I thank you for your help and patience.

[ChongKY1 1]

Nibroc, when i'm trying to open yours SendRecv.cxp, it's ask me to install the CPS in IO Table there, but where can find or get the CPS_CJ1M_CPU11_Ver4_0.xml file ? thanks

[gtsuport 61]

You will need to upgrade your CX-One version. If you registered your software, you can go on-line and upgrade. If you did not register, you need to. Hope this will help.