M
Michael Griffin
In reply to Curt Wuollet:
With respect to what is the essential difference between a PLC and a PC, we had a discussion about this point on this list back in 1996 where Dick Morley (considered by most people to be the "father" of the first PLC) had the following to say about it: "I guess that the original concept of a PLC is that it is programmed with proprietary languages with proprietary tools and controls I/O through a proprietary protocol or bus system. It was even then a computer, but was not called that since it might scare off the user base, since they were not very 'computer literate' at that point."
With respect to what is the essential difference between a PLC and a PC, we had a discussion about this point on this list back in 1996 where Dick Morley (considered by most people to be the "father" of the first PLC) had the following to say about it: "I guess that the original concept of a PLC is that it is programmed with proprietary languages with proprietary tools and controls I/O through a proprietary protocol or bus system. It was even then a computer, but was not called that since it might scare off the user base, since they were not very 'computer literate' at that point."