The ability of complete systems to function thru the use of the hard wired logic of relays,cam switches,on/off delay relays etc,process switches going from digital to electronic analog devices..............the advent of PLC started it all maybe 35 to 40 years ago then that evolved to the more sophisticated DCS and now smart starters & relays,CNC machines, smart this and that.The use of computers to send control commands to large systems etc.
I have to agree that the new technology is better and more reliable,easier to change control logic with preprogrammed data and touch pads and probably cheaper in the long run for example how long would it take to tear down a conveyor system relay panel & rewire same after it had been re engineered and designed versus running a 30 minute program,,,,,maybe a bad example but you know what I mean.
The use of simple(todays technology comparison) relay logic is still used and will be around for years to come but designing sheet after sheet of ladder diagrams to start or shutdown complete process units or even plants was more rewarding than hitting some keys on a keyboard.They have taken the fun out of design.
Okay just a vent for today,can't take it out on the dog all the time.
dick
I have to agree that the new technology is better and more reliable,easier to change control logic with preprogrammed data and touch pads and probably cheaper in the long run for example how long would it take to tear down a conveyor system relay panel & rewire same after it had been re engineered and designed versus running a 30 minute program,,,,,maybe a bad example but you know what I mean.
The use of simple(todays technology comparison) relay logic is still used and will be around for years to come but designing sheet after sheet of ladder diagrams to start or shutdown complete process units or even plants was more rewarding than hitting some keys on a keyboard.They have taken the fun out of design.
Okay just a vent for today,can't take it out on the dog all the time.
dick
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