PLCs - SLC 500 and ControlLogix

http://www.plctalk.net/qanda/  is probably a better place to ask

Thanks for the link.  I was not aware of plctalk.net.
MZE

Francis wrote:

SLC 500's are the older hardware. ControlLogix new and somewhat more
complex/virsistal... The software for the SLC will cost you quite a bit less
than the higher end stuff for the contrologix...
J M H O

st

St,
  In percentage terms, how much more would a similarly sized
ControlLogix system cost compared to a SLC/500 system?  I know there
are lots of options in both families, but all I am looking for is a
ball park figure on simulary sized systems that you may have worked
with.  Thanks.
Mze

St wrote:

I don't know what it's like where you are, but over here (down under),
CLogix is roughly 1.5-2 times more than a similar-sized SLC depending on I/O
count and type - including software.

Actually just last week we ripped out an SLC and replaced it with a CLogix
doing the same job - although they're a good platform when left alone, the
SLC was comparatively just too much of a pain in the butt..

Cameron:-)

I/O

Why was the SLC a pain in hte butt? I've done similar jobs and mostly it was
just because the customer wanted A-B's latest and greatest. I've also done
other jobs where I simply upgraded a 5/02 (DH485) or a 5/04 (DH+) to a 5/05
(Ethernet) just so the customer could resolve connectivity issues. Processor
upgrades are nice because it requires no I/O rewiring. In and out during
those jobs :)

The client is using CitectSCADA thru the RS232 port - so you need a PIC to
communicate.  I just don't happen to have one lying around... and that's a
pain in the butt.


5/05

Very true.. In this case:
1)  the client was putting in a CLogix elsewhere on their plant,
2)  the SLC had already grown to an extra rack in a box on top of the PLC
cabinet that was hard to get to (no room anywhere else) - the CLogix chassis
is more compact, did you notice that?,
3)  replacing the CLogix meant they didn't have to carry SLC spares as well
as maintain RSLogix500 *and* 5000 and
4) I didn't think about it (and neither did the AB sales guy ;-).

Cameron:-)

Well .. fortunenaly or unfortunenaly it was never passed by me what the
costing on systems were. All I have had to do is spec out what. Or had it
specd' for me and had to work with them.  I'll say that servo control is a
bit easier with the contrologix than with the SLC's

Most of the AB suppliers would be glad to price out systems..


st

I would like to thank all of you for the post you made in this thread.
I have heard that Clogix is about 40-100% more than a silimilar SLC
500.  It is nice to know that the newer technology makes life easier
when implenting servos.  I will assume that this is also the case with
process control systems.  Again, thanks for all the input.

MZE

St wrote: