Yes, the diffusion of innovation can be very slow. The older people that are the decision makers, want to keep using the technology they know. They sure do not want to change to the technology that the others know much better than they do. 50 years from now, we will be laughing about how long we used something so stupid as ladder logic!!!!
Well, the people on this list are typically not using ladder logic, or they would be buying PLCs, but it is funny to hear that some want to run ladder logic on the 7xxx series.
Don.
On 1/13/07, Yan Seiner <> wrote:
--- In ts-7000%40yahoogroups.com, "Don W. Carr" <> wrote:
>
> Yes, it is sad, but we will keep using ladder logic for the foreseeable
> future.
:-) My boss is firmly in the ladder camp. He understands it much
better than I do... From the field perspective, ladder is going to
be with us for a long time. But the newer PLCs use a structured,
object aproach, so PLCs are merging.
> > My current project consists of multiple sets of four servo drives
> > programmed in a form of multi-taskinng Basic, each monitored by a
> > 7300 with encoder inputs. The overall control and sequencing of the
> > systems - and also the interface to the customers production line
> > equipment is via an Allen Bradley PLC programmed in Ladder logic.
> >
Hmmm..... Is there any interest in a 7300 - PLC interface? We're
having TS build an opto-isolation board with RS485, RS232, and 16 IO,
as well as an LCD interface, and I'd love to have some cost
sharing.... :-)
--Yan
-- Dr. Don W. Carr J. G. Montenegro 2258 Guadalajara, Mexico +52-333-630-0704 +52-333-836-4500 ext 2930
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