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-CH001.3D – 4 – [1–17/17] 19.6.2004
9:05PM
1.6Baseunit,extensionunitsandextensionblocks
Figure1.1showsabaseunitalongwith2extensionblocks.
Itisveryimportantthatconfusionisavoidedwhentheseunitsarediscussed.
Thebasicwaytodescribethedifferencebetweenabaseunit,anextensionunitandan
extensionblockisasfollows:
1.Abaseunitismadeupoffourcomponents,i.e.powersupply,inputs,outputsand
CPU.
2.Anextensionunitismadeupofthreecomponents,i.e.powersupply,inputsand
outputs.
3.Anextensionblockismadeupofoneortwocomponents,i.e.inputsand/oroutputs.
Itcanbeseenthattheextensionblockdoesnothaveapowersupply.It
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