Can cables and external stepper

Shoki

Thanks for the detailed explanation. With your recommendation I checked all the listing of Farnell.

I think I found a winner :
https://fr.farnell.com/lapp-kabel/2170204t/cable-profibus-par-metre/dp/3034318
It's advertised as a BUS Cable with two pairs of stranded core wires and an impedance of 120 ohms.

Or this one :
https://fr.farnell.com/belden/9829/cable-blinde-2pair-24awg-gris/dp/1218666
Which has an impedance of 100 ohms, and also stranded core wires

PS - what sort of cable is normally used in France for connecting a telephone socket to a DSL modem/router?

I have no idea. I haven't seen one in ages. Every place I worked/lived in the past 5 years have had optic fiber router.

Falcounet

For moving cables, Chainflex series cable from Igus can be found at good prices.
They would be a bit more expensive than usual cables but they may also last longer.
You can find other references (mainly depending on the bend radius) using their configurator : https://chainflex-productfinder.igus.tools/ Select "Can bus" under "system bus" select-box

https://www.tme.eu/ is distributing them for non-pro buyers (Not sure you can buy directly from igus as non-pro)

Shoki

@Falcounet
Thanks, the thing is, i'm doing this for my work so I can use a pro account. But buying things at my work is a pain (except from Farnell or RS...)

dc42

@fbunel yes those cables look suitable, although overkill because they are shielded. The Belden one may be more flexible than the Lapp one.

The Chainflex series from IGUS that @Falcounet suggested also look good. You can select "Bus cables" and then "CAN bus".

Shoki

@dc42 @Falcounet
Yes, I found the reference from Chainflex Igus on RS on which I can order easily.
https://uk.rs-online.com/web/p/control-cable/210-0497

They seem perfect for the application.
Only problem is that they are not twisted pairs. Do you think this might be an issue ?
I was looking at this one with 4 wires so I can run the Bus IN and Bus OUT in the the same cable.

This is probably overkill but this machine will be used intensively so I don't want to cheap out and make sure the cable will hold in time.

Also, I have an additional question, what would be the temperature limit of the toolboard 1LC ?
Will it hold up in an heated enclosure (let's say 70°C, but maybe more) ?

dc42

@fbunel if the bus goes there-and-back along the same cable then it's not ideal.

Have you considered using one or two pairs from a flexible (not solid core) Ethernet cable?

Falcounet

@fbunel The wires are indeed twisted.
You can see it at the product image : https://www.igus.fr/product/1112?artNr=CFBUS.001

Shoki

@dc42
I'm going mad trying to choose cable knowing very well it will probably work fine whatever I choose.

Things are :

I can't order from the internet, only RS and Farnell
I don't have access to anything that I don't buy. I know it's stupid but I can't take one ethernet cable that is laying around...
I would like to have it quickly
I don't have to worry about the money...
I'd like the right cable for the application.

@Falcounet said in Can cables and external stepper:

@fbunel The wires are indeed twisted.
You can see it at the product image : https://www.igus.fr/product/1112?artNr=CFBUS.001

Yes they are twisted but not in two pairs of two I believe. All four are twisted together.
In their daratsheet they are markes as 4x0.25 and not 2x(2x0.25) like other Bus.

Falcounet

@fbunel CAN bus only need 2 wires. If you have more than 1 node and you need to run cables along, why not just use 2x CFBUS.021 ? Especially if you don't have to worry about the money.
Bear in mind you need another cable for power though. Usually, the (4x0.25)C cables are used to carry power with the bus for low-power devices (CAN encoders, etc ...)

Shoki

@Falcounet
I don't need the 2 can line for now as I have only one tool. But in the near future, I will have more tools so I will need the CAN IN line and the CAN OUT line.

Yes, 2x CFBUS.021 is actually a very good idea. I will probably do that.
I just thought this would be way over kill since they are 20AWG and a smaller cable that could flex more would be better.

I just realised one thing, since they are so thick, can I also use these cable to run the power line ?
If I run just three of these cable to the toolhead, two for BUS and 1 for power, this will make a pretty neat solution.
Is there a difference between cable like these made for CANBUS and regular power cable ?

Shoki

For anyone reading this, I spent 4 hours searching through RS and Farnell for references.

I removed all the cable with impedance not being 120 Ohms, and searched for 22-24 Awg cables.

The one I find that suit the best this application are the following :
(If some of the specialists here could confirm these choice that would be great.)

Alpha wire 6413, 2x(2x24AWG), Impedance 120 Ohms, Outer Diameter 7.1mm, Temp -20 to 80, unshielded :
https://fr.farnell.com/alpha-wire/6413-sl005/cable-24awg-2-pair-slate-30-5m/dp/1746265?st=6413

Lapp Kabel 2170204T, 2x(2x24AWG), Impedance 100-120 Ohms, Outer Diameter 7.1mm, Temp -5 to 70, shielded (i think)
https://fr.farnell.com/lapp-kabel/2170204t/cable-profibus-par-metre/dp/3034318

And if you want way overkill, you can run two of these cable

CFBUS.LB.021, 2x20AWG, Impedance 120 Ohms, Outer Diameter 8.0mm, Temp -50 to 70, shielded
https://fr.rs-online.com/web/p/cables-de-controle/1854913

The last one is the only one that is purposely made for dragchains and to move.

I will try my luck with the first one.