DH+ Multi Hop Messaging

[Ricster]

I'm trying to read from a PLC5 controller that is separated by three DH+ networks from the ControlLogix controller that is reading the data. I'm having a little trouble configuring the path from the ControlLogix to the PLC5. Here is my layout:

ControlLogix Processor - Slot 0
DH+/RIO - Slot 1, Port A Configured for DH+ (Node 4)
}
PLC5 - DH+ Channel 1A (Node 1)
- DH+ Channel 2A (Node 1)
}
PLC5 - DH+ Channel 2A (Node 4)
- DH+ Channel 1A (Node 4)
}
PLC5 - DH+ Channel 1A (Node 1)

I have a message instruction set up in the ControlLogix using PLC5 Typed Read. My communication method is DH+ and the path is:
'DH_Plus' (configured name of DH+ port in I/O Configuration)
1 (Address of first PLC5)
2 (for Port 2A)
4 (Address of second PLC5)
2 (for Port 1A)
Destination node address is set to 1.
The MSG block just errors out with Error code 1 and Extended error 311 - "Port not available".

Can what I'm trying to do be done? Any help on how to configure the path would be most appreciated.
Thanks!

 

[JHarris]

interesting

I'd be interested to see if you can bridge across the 2 channels on a PLC5. Please test that if you have a chance and post back.
(i.e. do a test read/write to the second PLC5).

Regards,

Justin

 

[Ricster]

I tried multiple path configurations and was not able to communicate across the channels on a PLC5. The problem is how to refer to the channels in the DH+ path. According to the info I have Port A is assigned the number 2 and Port B is assigned 3 in the path. There doesn't seem to be a way to specify Channel 1A or Channel 2A.

I conferred with some other tech support people and the consensus was that what I was trying to do could not be done. The recommendation was to add a MSG instruction on each PLC in the chain to move the data from one end to the other.

Unless anyone else has more info I guess that is what I'll have to do.

Thanks

 

[Oakley]

Look into multihop messaging via the RA Answer website (formerly known as the knowledgebase). You can set up and program the DHRIO module configuration.