PLUS+1™ Hardware > I/O Modules

How many OX024-010 can be controlled by a CAN Port

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Gregor:
Hi Forum
Does anyone how many OX024-010 could be controlled by one Can Port? I´d like to use a MC050-010 with five output modules on one CAN1. CAN0 is Used to comunicate with an MC050-55 using 6 send and 3 receive messages.
Would it be better to set a few modules to CAN0?
Was there a rule of thumb for the CAN Traffic that is generated by the modules and one CAN message?

In my whole project i´d like to use 1x MC050-055 with 1x IX024-010 and 2x 12 Keyed Keypads (third party)
                                               1x MC050-010 with 5x OX024-010
                                               1x MC024-010 (turnindicators, headlights and Working lights)


Kind regards Gregor

Jakob:
Hi Gregor
I use CAN-king to measure the CAN-bus load, generally I try to keep the load below 60% leaving some room for the servicetool communication.
If the load exceeds 60% or there about, I try to split the CAN-bus traffic or change some timing of the messages.
Expansion modules such as the OX and IX generate a good deal of traffic, however you can lower the frequency of which the modules send different feedback values.
So it all depends on how you set up your timing.

I believe your project could be done on one CAN-bus, but splitting it up in two would most likely save you a lot of trouble.
Anyway that's my advice.

regards Jakob

mebib:
Hi Gregor

Check the Technical Information of the Controller http://www.sauer-danfoss.com/stellent/groups/publications/documents/product_literature/520l0719.pdf
On page 21 you can find the estimatet bus load and the memory usage of the each I/O- module.

Regards

Jakob:
Right you are Mebib, I knew that I had seen those numbers somewhere :)
Just keep in mind that the servicetool needs 30-40% to work properly.

Gregor:
Thank you Folks!
I will split the modules on the two CAN busses. 3/2 then i´ll have room for the Servietool and a few other messages on one CAN-port.
and i´d like to increase the bus speed up to 500 or even 1000 Kbit/s i think that will drop the bus load too.

Greetings
Gregor

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