Parallel Outputting off a Logo

[mr_electrician 9]

Hello guys, as you know from my previous post, I have maxed out my LOGO outputs. The company does not want to buy a small plc yet, but I need to add 4 new conveyors to the system. My thought is as follows. Our machines feed finished parts onto a main spine conveyor. I was thinking that an easy solution would be to group 3 or 4 contactors which are 24vdc (each spine cponveyor currently is asigned to it's own output), and have 1 output turn on those 3 or 4 contactors. I would be well in range of the current rating of the relay output. Each contactor draws 197mA, the rating of the LOGO output relay is 10A. Does this sound like a good fix for now, or is there any other ideas or examples out there? Let me know what yopu would do.

[Crossbow 295]

If they all have to turn on at the same time, I see no problem with this as long as you don't exceed the 10A rating. Keep in mind too the extension block relays are rated at 5A, not 10.

[malc cope 1]

Hi Fairly common practice would be to drive the first conveyor contactor from the output then cascade all other conveyors from a auxillary off the first then use the last to give a running ip it required, see attachment cascade.bmp

[504bloke 1]

Can you not add a logo extension block ? Or even another logo and network them?

[Crossbow 295]

Logos can't be networked. They support action as a slave on LonWorks or AS-Interface, but cannot master a network.

[mr_electrician 9]

That I have done. I have 2 expansion packs on it and I have maxed out my outputs at 16. Logo has a max inputs of 24 I believe, and a max output of 16. That I know! Edited 1 Apr 2007 by mr_electrician

[sohail0110 0]

you can do that as mr CROSSBOW said but be careful of starting torqe load and you have to get the induvidual O/L outputs for fault indication and the other N/O contact you can use to halt the system for safty perpus.there is no networking in logo but you can share the instructions by peralel connections to logo inputs. i think it will help you regards sohail