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plc is a programmable logic controller RTU is remote terminal unit and DCS is distribute control system , scaada consists of rtu and mtu (master terminal unit), dcs and LTU for long distance plc used one master cpu but dcs used more masters cpu by dcs program connect in on server
From My Work Experience and theoretical Understanding RTU it can be used to Monitor Some kind of Process Thats available in The Work enviroment (Oil Well Heads, Pipe Line, Electrical Substation And Water Treatment Process), And its Depend on The Customer Need you can Control The Application When You Need For Example ( Controlling VSD Systems, ESD for Unsafe Act Enviroment,And Also you Can Put Your Own Script (using Basic, C language) ,But The RTU it Can Not Act Fast Enough in Very Complicated Scenario Like PLC , using Ladder Programming in PLC (Yokagawa, AB,Schenider,Siemens,..etc) And This Option is Not Mostly Available in Starndard RTU unless Requried by Customer, Because Mostly They Are using RTU in Very Simple Scnearios Unless Customer Choose to Modify, PLC Can do The Work OF RTU very easy, Keeping Up With Different Kind of Protocols Like RTU (DNP3,Profibus,Canopen, MODBUS ASCII,MODBUS PLUS,MODBUS RTU, MODBUS TCP/IP),PLC Also it Can be Attached to Any SCADA Systems, Only Configure The Tag Address u Need to retrieve The Data From it, Historical Server, And Screen Builder for Animating The Output from The PLC And You Will Monitor What ever you have in Your Screen about What Plant Process Through Your PLC, So its Not Standard That Why RTU is Attached to SCADA And PLC Attached to DCS, its Depond on Application That Customer Need.
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PLC and DCS are controlling Systems, get data and output some controlling function according to control program and set point from user.
While RTU is data collection System it uses with SCADA to monitor this data from Remote distancees.
plc is a programmable logic controller & RTU is remote terminal unit PLC is “Programmable Logic Controller”, its main function is performing plant control loops, mathematical calculations, sequence handling, interlocking….etcPLC is normally use for local plant monitoringRTU is “Remote Terminal Unit”, from its name you find out that its function is to transfer data “Remotely” which have more powerful communication capabilities