Re: PLC Programming - anyone?

Hi Chris,

I think the group would agree that this is pretty darn easy.

your choices are almost unlimited, possibly even totally hard wired.

you can use a 'brick' plc simple self contained unit, no display,
would be something like an automatin direct 05, 8 ac input lines and
8 ac output lines. assuming all your relays and switches can be the
same voltage (all 24 or all 110) 0.5 amps max. this will control up
to 8 relays if you need more than 0.5 amps per line. if you need
lesss, it can be used direct.

then it can see 8 inputs, end switches, manual start/stop etc.

then you can do the timing functions.

hardware : $115.00
software : $99.00 shipping and handling.


- - - or - - -

you can pull out that old 486-66 pc
get turbocnc, and get out your soldering iron.
put together a simple unipolar style motor controller
but instead of windings, you use relays.
again, if your amps are low enough, you can use them
direct.

Maybe contact one of the guys selling the
stepper motor kits to see if they can
offer 4 relays instead of one unipolar motor.


cost pc ??
turbocnc $10.00
board , reistors, transistos, ?? $30 ??
your time. ??

--------------------
remember the software will have a learing curve
either way.

if you plan on doing a more robust CNC project
down the road, I'd lean to the CNC.

if you wanted get it done by friday,
the plc comes complete. just add
programming.

hope this helps.

Dave
(gotta check that all the same voltage thing
with the 05 plc unit)

--- In CAD_CAM_EDM_DRO@y..., "Chris Clough" <cclough@x> wrote:
> Hi Dave,
>
> What I'll have is this.
>
> 3 solenoids
> 3 normally open switches
> 1 on/off dry contact that is controlled by the controller
>
> I'm using a Turner Technologies MC2001, so the Gecko's and such
aren't
> an option.
>
> If you could help, that'd be great.
>
> Thanks,
> -Chris Clough
>
> Xtech Engineering
> http://www.xtecheng.com/
> info@x...
> Ph# 866-55-XTECH
>
>
> -----Original Message-----
> From: dave_ace_me [mailto:davemucha@j...]
> Sent: Friday, February 22, 2002 11:24 PM
> To: CAD_CAM_EDM_DRO@y...
> Subject: [CAD_CAM_EDM_DRO] Re: PLC Programming - anyone?
>
> Hi Chris,
>
> just like any control devices, look for the signals
> you will need. Digital (on/off) or analogue (4-20mADC)
> analogue will always be a lot more.
>
> then look at the speed of the pulse train both
> input if reading a field device and output
> going to your device.
>
> Automationdirect.com offers a variety of units,
> small unit with slower speed and less memory
> to networkable units that can power an entire factory.
>
> Check the ratings on the input and output modules and
> see if they fit your requirements.
> both power and speed.
>
> A PLC can be cheaper than a PC running professional
> software, or if you have an old PC and use
> TurboCNC ($10) and a Gecko, ($150??) you can
> get by pretty cheap. remember if you use the
> PLC you need to learn the ladder lodgic language
> but if you use a CNC software package that runs
> on a PC, MAster5 and a decent Pentium II or better
> you can get great help on one of these sites.
> (currently a speed limitation on stepper pulses)
>
> A PLC is really nothing but a microprocessor
> and a software package.
>
> Yes they can be faster if you buy a higher end unit
> but then you won't get the pretty displays unless
> you dedicate a PC to monitor it, but if you
> buy or dedicate a PC, you have what you need
> to do the control too. catch-22
>
> how many outputs do you need ?
> ie: switches on and off
> stepper/servo's
>
> how many inputs?
> ie: end switches
> encoder feedback
>
> break your needs down into the basic application
> and evaluate your choices/options.
>
> Dave
>
>
>
>
> --- In CAD_CAM_EDM_DRO@y..., "Chris Clough" <cclough@x> wrote:
> > Hi guys,
> >
> > I'm trying to get my BPT Series I power drawbar finished up...
need
> to
> > use a PLC, but I have no clue what to do. Is anyone on the list
> familiar
> > with brands and models that could help me out?
> >
> > Thanks,
> > -Chris Clough
>
>
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