July 2004
Intermediate to advanced
352 pages
9h 30m
English
Content preview from Mitsubishi FX Programmable Logic Controllers, 2nd Edition
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//INTEGRAS/ELS/PAGINATION/ELSEVIER UK/PLC/3B2/FINALS-7-6-04/ 0750656794-CH023.3D – 249 – [247–264/18]
19.6.2004 9:18PM
Encoderwaveforms
Encoderaccuracy
ThedrawingoftheencoderdiskshowsthatitonlyhasfourON/OFFsegmentsper
cycle.Hence,foreveryrevolution,thereareonlyfourcompletepulses.Thisgivesan
accuracyof360/4¼90
.
Industrialencoders
Amodernindustrialencodercanproduce16384pulsesperrevolution,whichmeans
thatthepositionoftheshaftdrivingtheencoderdisk,canbemeasuredtoanaccuracy
of360
/16384¼0:022
.
23.3FXrangeofhigh-speedcounters
Thehigh-speedcountersC235–C255,listedinFigure23.3,canbeusedwiththefollowing
PLCs:FX1S,FX1N,FX2N,FX2NC.
A phase
B phase
A phase
B
p
hase
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