PLC和触摸屏组合控制系统的应用_吕品.pdf

PLC PLC A pp lica tion o f Cont ro l Sys tem Com posed of PLC and To uch Sc reen ( 内蒙古科技大 信息工程 院, 内蒙古 包头 014 010) : PLC, PLC S7200 CPU 224XP , , PLC PLC, , RS485/R S232, : PLC : TP273 : A A bstract: In order o m ake he applica ion of PLC m ore flex ible an d in visu aliza ion, he com b ined PLC and ouch screen con ro l sys em is re searched. By adop ing S7200 CPU 224XP as he con ro ller, an d D wi en ouch screen asm anm ach in e in erface, h e em pera ure an d pressure sign als in he field are co llec ed, an d he ac ua ors are con ro lled. Th e fabr ica ion m e hod of he ou ch screen in erface, designm e h od o f PLC program and h e problem s en coun ered in design process are descr ibed in de a i.l In con sidera ion o h e fac h a Siem en sPLC canno comm un i ca e w ih D wi en ou ch screen direc ly, h e da a fram e and da a ransm ission m ode o f D wi en ou ch screen are an alyzed in de a il an d h e passive RS4 85/RS232 conversion circu i has been design ed. The sys em h as b een pu in op era ion w ih excellen resul s. K eyw ords: PLC Touch screen Program An alog variable Free por comm un ica ion Tem p era ure curve 0 S7200 , , PLC , PLC A /D , P ID ; 21 PID , PLC [ 1] , PLC RS485, PLC RS232, , R S485 / PLC R S232 1 , , [ 2] , , , , ; PLC, 1