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what is diffrence between analog card and digital card in
plc.how analog card work,Please explain in detail.Please
send it on abhi_vyas@sify.com
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Answer Posted / kulamani meher
digital card used for digital input and digital o/p.digital
i/p means status of allswitches whether it is on or off and
pump rts (ready to start),run conform & trip
indication .digital o/p means pump start ,stop,
local/remote. it deals only binary either on or off (0 or
1).analog card deals with analog i/p & analog o/p means 4to
20 ma.analog i/p means for ex. in case of control valve %
of open & close needed so according to 4 to 20 means 0 to
100% open close .analog o/p means o/p from all
transmiter.for ex . in case of level transmiter 50% level
in tank means o/p is 12ma .4ma-0,8ma-25%,12ma-50%,16ma-
75%,20ma -100%.
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