PLUS+1 User Forum

PLUS+1 Hardware => I/O Modules => Topic started by: Gregor on July 03, 2013, 10:51:03 AM

Title: How many OX024-010 can be controlled by a CAN Port
Post by: Gregor on July 03, 2013, 10:51:03 AM
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
Title: Re: How many OX024-010 can be controlled by a CAN Port
Post by: Jakob on July 03, 2013, 08:56:00 PM
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
Title: Re: How many OX024-010 can be controlled by a CAN Port
Post by: mebib on July 03, 2013, 09:57:00 PM
Hi Gregor

Check the Technical Information of the Controller http://www.sauer-danfoss.com/stellent/groups/publications/documents/product_literature/520l0719.pdf (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
Title: Re: How many OX024-010 can be controlled by a CAN Port
Post by: Jakob on July 03, 2013, 11:12:44 PM
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.
Title: Re: How many OX024-010 can be controlled by a CAN Port
Post by: Gregor on July 05, 2013, 08:05:41 AM
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