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hi... i'm about to learn siemens plc
i came across following question in my mind ... plr ans
1. hw motor operated by plc
2. hw drive operated by plc
explain dis by both ladder logic diagram and hardware config , connection
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Answer Posted / dipesh shrivastava
All plc's work under four checks
Ai - Analog I/p
Ao- Analog o/p
Di - dig I/p
Do- Dig o/p
Commands like Motor on & Off are Do's
Commands like Drive operation, control valves operations means any type of partial operations between its low range and high range will be AO
Inputs are of 3 major types , (0-5) V DC, (0-10)v DC & (4-20) mA
All types of feedbacks like proximity ( PNP,Npn ) then feebbacks like actuator open/close, Motor on/off/trip, Feeder healthy/not healthy will be Digital inputs
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