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Guest jeds

Linking Omron With Allen Bradley

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Is it possible to link an omron plc with an existing allenn bradly plc? How?

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1. What Allen Bradley PLC? 2. What Omron PLC? Some options: Use Omron Serial Port to send DF1 protocol to Allen Bradley serial port. Use Allen Bradley Serial Port to Send Omron Hostlink Protocol to Omron Serial Port. DeviceNet Ethernet TCP/IP Tell us more about your setup. Please register at MrPLC.com. Register at MrPLC.com

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Jay, Ethernet TCP/IP is not a good answer. TCP/IP is just a way to send information back and forth. It does not specify the format and meaning of the data in the packets. This definition of format and meaning of data is called the application layer. Each PLC has its own application layer. Omron uses FINS. Rockwell uses CSP and Ethernet/IP. FINS is not compatible with either CSP or Ethernet/IP. Therefore a AB PLC can recieve Omron packets, but it would not know what to do with them. This is not useful. Does Omron support Ethernet/IP yet? There have been press releases saying they will but I know of no Omron products that actually communicate using Ethernet/IP.

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It depends on how much ladder you want to undertake. Omron has examples on how to accomplish Ethernet/IP and Modbus/IP using the above method. Until the standard becomes more stable and less fluid, I doubt it will progress much further.

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What standard? Which is not stable? That real problem is that PLC do care if their PLC can communicate to another brand of PLC. It doesn't make economic sense. Our solution is to be multi-lingual and to be able to use many different application protocols at once. BTW, our product can provide over 2000 words of globally shared data that can be access by 4 different brand PLCs over Ethernet.

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It's worth considering using two DeviceNet Scanners, one AB one Omrnon on the same DNet segment. One of them, the AB one at least, can be used in slave mode to act as I/O to the other. In this manner you can pass a chunk of data (128Words??) from one scanner to the other. Its not the cheapest approach, but it is applicable across a large range of PLC types, PLC, SLC, CLX etc....and it is fast. Things are moving fast in this area, especially since Omron signed up to the Rockwell NetLinx technology a year or so ago. It is quite likely Omron have a processor supporting Ethernet/IP now...but beware not all processors from either supplier will support this yet.

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This is a good solution. The Omron Devicenet master can be a slave at the same time(1024 bits.) (Also handles explicit messaging for memory mapping outside the slave addresses.)

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