Comparing PLC and DCSComparing PLC and DCSI am new in the field of automation. Could anybody tell me the difference between PLC and DCS other than IO handling capacity I am new in the field of automation. Could anybody tell me the difference between PLC and DCS other than IO handling capacity Now a days you cannot really tell the difference between a PLC or a DCS. Since the PLC was integrated with Analog IO it crosses the boundary of being just digital and crosses to the realm of DCS in handling Analogs, Bus Systems, Distributed IO and etc. Also, since the DCS now handles logics of Digital IO it also crossed the boundary to the realm of PLC. View and Download AllenBradley MicroLogix 1100 user manual online. MicroLogix 1100 Controller pdf manual download. Algorithms For Computer Algebra Pdf Download. Calculators, engineering, mechanical, electrical, electronics, design, construction, manufacturing, consultant, layout, software, chemical, plastic, polymers. Files/images/deltroniks/5-6.jpg' alt='Industrial Electronics And Control Including Programmable Logic Controller Pdf' title='Industrial Electronics And Control Including Programmable Logic Controller Pdf' />As you know PLC as to its name Programmable Logic Controller. Its main purpose is to replace the relay logic controls which is On or Off. And DCS Distributed Control Systems its emphasis is Fast analog handling because of communications through Bus systems, networking and etc. Summarizing all these, PLC DCS. Hope that I shed light on you. Your 1 Industrial Electronic Repair Solution for Industrial Electronics. We quickly repair Circuit Boards, Drives, Motors, Servo Drives, Power Supplies, Light. The brushless DC BLDC motor is becoming increasingly popular in sectors such as automotive particularly electric vehicles EV, HVAC, white goods and industrial. CM1X11S30 IGS, STEP, and XB CAD files, and dxf, pdf drawings for the Cool Muscle CM1X11S30 USB Cable Drivers Drivers for the CM1US1, CM2US2, CM1US3, and. If taken from a narrow point of view, maybe PLC and DCS are functionally the same. However, a lot of plant technicians and engineers are not aware of the other side of the debate, namely the engineering effort and the commercial ramifications. Of course, for huge plants with IOs ranging from 1. IO points, and beyond, it is silly to even think about PLC. From my experience, a DCS is not the same with PLC in the realm of huge systems such as oil and gas plants, as the following list will show 1. A PLC is cost effective up to a certain IO count, and so is the DCS. Atmel microcontrollers deliver easytouse embedded design solutions with low power consumption and high performance for an array of applications. Atmel AVR 8bit and 32bit microcontrollers deliver a unique combination of performance, power efficiency, and design flexibility for a wide range of applications. Measurement and Control of RF Power Part II by Eamon Nash Download PDF. The term log amp, as it is generally understood, refers to a device which calculates the. But the difference is in their starting points the PLC is cost effective from 0 to a few thousand IO points the DCS becomes cost effective starting from a few thousand points and beyond. A PLC becomes a subsystem of the DCS in rare occasions when the situation calls for it, i. Industrial Electronics And Control Including Programmable Logic Controller Pdf' title='Industrial Electronics And Control Including Programmable Logic Controller Pdf' />DCS schedule IO lists cannot be submitted on time before the DCS hardware freeze date. Note that this package system is a process system using continuous control, not discrete. Based on this, a PLC can never be larger than a DCS in terms of IO count. In large plants the DCS is king because most owners want a single source of hardware support and service, and this mentality naturally denies the PLC a foothold. Package vendors are no longer required to provide PLC for their system. Everything is connected to the DCS. WAGPLCProgrammable Logic Controller. DCSDistributed Control System. A PLC can be a component of a DCSA DCS can include Networked PLCs, PCs, or other control equipment sharing or distributing control of a process or processes. Key word being distributed. As I understand it, the two really dont compare as a PLC is Programmable Logic Controller and DCS is Distributed Control System. Generally, PLCs are stand alone and perform a particular task, where a DSC is a network of PLCsRTUs that communicate in some fashion to accomplish a particular task. For example, in a water filtration plant, there might be a PLC that is used to perform a backwash of a particular filter, in that same water plant a DCS may be communicating with 1. PLCs and starting the backwash routine when required. While a trivial example, it serves as an illustration, although having programmed hundreds of such filters, I cant ever recall putting a seperate PLC on each filter. Just not cost effective. DCS initiating backwash might be true in some cases but in many cases it would be inititated on time, dp, or flow locally. In fact, most of the installations I have seen of such things are indeed standalone and typically only report alarms and status to the DCS and rarely does the DCS actually do any control at all. But, YMMV. Bob Peterson. The differences between PLC and DCS 1. PLC only handled sequential process than DCS can handled both Continue process and large loop control. If we see from security angle, PLC doesnt have dongle so peple can crack the software easy. DCS have a dongle so its only license to industry which have it. Why this question, may we know From my opinion DCS systems are more complex and include HMI. The realtime HMI database is generated when programming the PLC which is the part of DCS system. When you want communicate with bare PLC the realtime database must be created manually. In DCS systems the realtime database is also distibuted so each operator station has its own RT database. There are also so called Hybrid System like Honeywell Plant. Scape where RT database is created automatically during PLC programming but is stored at realtime server so it is not distributed. The following is basically a cut and paste from something I posted some time ago on another forum specifically to answer a beginners questions about DCS SCADA PLCs HMI MMI etc. It seemed to help him so maybe theres something in here which will help you too. Disclaimer to one and all What follows is a general beginner level discussion there are exceptions to all of these rules. Lets see how simple we can make it by first building a SCADA system and then by building a DCS system each from the ground up. Suppose that were building a brand new factory and suppose that our first piece of equipment is something like a big industrial oven. This thing will be made up of heaters, and valves, and conveyor motors, and other assorted machinery so lets say we get to work and we build us an oven. Now that weve got the mechanical part of the oven built we need some type of controller for it something to accurately control all of those different parts in order to turn raw material into a sellable final product. So what type of control are we going to use How about a PLC a Programmable Logic Controller In very simple language a PLC is a type of computer. But the computers that most people are familiar with use a keyboard as an input device and a screen for an output device. PLCs dont have a keyboard. So for an input device, we use an input module which is basically a little box with a row of screws on the front of it. We wire up a bunch of pushbuttons, sensors, switches, etc. PLC computer. We do something similar for an output device. Instead of using a screen for an output device, we use an output module which is basically another little box with a row of screws on the front of it. We wire up a bunch of solenoid valves, indicator lamps, motor starters, etc. PLC computer. So for this first example, lets say that we decide to go with a PLC system. We buy the PLC and install it by connecting wires between the oven and the PLC. Then we buy a copy of the programming software from the PLC manufacturer and then we write a program for the PLC well probably use ladder logic programming, since thats what most PLCs use as their native language. And now the PLC is just about ready to properly control the system except that we still need some way for the operator to set and to monitor the temperatures and to start and stop the conveyors and so forth. Now for this small system, some meters and pushbuttons and some thumbwheel switches might do just fine. We could wire those up and build us an operators control panel for our oven. But another better way would be to use an HMI a Human Machine Interface. This used to be called an MMI Man Machine Interface but now a days weve got to be more politically correct. So we buy us a nice desktop computer and some type of HMI software. Free Online Calculators for Engineers. Welcome to CALCULATOR EDGE, an online FREE Engineering. Calculators for Engineers and Students worldwide. Our website features more than few hundred calculators. Electrical, Mechanical, Chemical, Electronics. Civil, Metallurgy, Oil Gas, Optical, Plastics. Ceramics, Physics, Maths and many more to come., if you have any.