CANopen network solution for more than 127 nodes

Hello all, I'm interesting to develop a CANopen network with possibility to expand up to 512 nodes. I would realize it using 8 sub-nets with max 32 nodes (125Kbps with fault-tollerant transceiver) each one and 8

*CANopen gateway* with 4 sub-net ports (125K) and one high-speed (500K) port to realize the main network where gateways will talk each other and to PC. Nodes will need only few RPDOs and TPDOs to implement the system. How to realize it keeping CANopen standard (max 127 nodes also using full 29 bits extended identifiers) ... ? Any suggestion ?

Thanks in advance for any help.

Luigi

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LuisFR15
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On Sun, 6 Jan 2008 14:40:11 +0100, "LuisFR15" wrote in comp.arch.embedded:

If I remember correctly, and I am pretty sure that I do, CANopen mandates the use of 11-bit standard length addresses. If you use

29-bit extended addresses, you can't conform to the CANopen standard no matter what else you do.

If you want to use standard CANopen, use standard CANopen and limit yourself to the maximum number of nodes specified by that standard. If you want to exceed the standard, either look for another standard or devise your own.

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Jack Klein
Home: http://JK-Technology.Com
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Jack Klein

That is not true. CANopen Standard 301 allows the use of 29bit identifiers for some services e.g. PDOs and SDOs.

The "standard" way is using CANopen/CANopen gateways to extend network size and node numbers. It was CiA 400. I have to check the standard number to be sure. The standard describes CANopen/CANopen gateways to build hierarchical or non-hierarchical CANopen networks.

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with best regards / mit freundlichen Grüßen

   Heinz-Jürgen Oertel
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Heinz-Jürgen Oertel

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Heinz-Jürgen Oertel

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