Industrial Control Systems
Different Types of Industrial Control Systems are Distributed Control System (DCS), Remote terminal unit (RTU) and Programmable logic controller (PLC).
Distributed Control System (DCS)
Plant distributed control system (DCS) – While the term DCS applies in general to any system in which controllers are distributed rather than centralized, in the power generation and petrochemical process industries it has come to refer to a specific type of control system able to execute complex analog process control algorithms at high speed, as well as provide routine monitoring, reporting and data logging functions.
![What is DCS (Distributed Control System) Industrial Control Systems](https://instrumentationtools.com/wp-content/uploads/2019/07/What-is-DCS-Distributed-Control-System.png?ezimgfmt=rs:719x468/rscb2/ng:webp/ngcb2)
Figure : Simple example of distributed control systems
In most applications, the input and output modules of the system are distributed throughout the facility, but the control processors themselves are centrally located in proximity to the control room.
These systems typically use proprietary hardware, software and communication protocols, requiring that both replacement parts and technical support be obtained from the original vendor.
Direct digital control (DDC)
The DDC directly interfaces to the process for data acquisition and control purpose.
- That is, it has necessary hardware for directly interfacing (optoisolator, signal conditioner, ADC, etc.) and reading data from process.
- It should also have memory and arithmetic capability to execute required P, P+I, P+I+D control strategy.
- At the same time, the interface to control vale should also be part of DDC.
The below Figure shows the various functional blocks of a DDC system
![What si DDC (Direct Digital Control)](https://instrumentationtools.com/wp-content/uploads/2019/07/What-si-DDC-Direct-Digital-Control.png?ezimgfmt=rs:778x418/rscb2/ng:webp/ngcb2)
The microprocessor performs the following tasks.
- It reads the various process variables from different transmitters through multiplexer and ADC.
- It determines the error for each control loop and executes control strategy for each loop.
- It outputs the correction value to control vale through DAC.
Direct digital control (DDC) systems are used in the commercial building heating, ventilation and air conditioning (HVAC) industry to monitor and maintain environmental conditions.
![Direct digital control (DDC) systems Industrial Control Systems](https://instrumentationtools.com/wp-content/uploads/2019/07/Direct-digital-control-DDC-systems.jpg?ezimgfmt=rs:415x272/rscb2/ng:webp/ngcb2)
They consist of local controllers connected to a network with a personal computer (PC) based central station which provides monitoring, reporting, data storage and programming capabilities.
The controllers are optimized for economical HVAC system control, which generally does not require fast execution speeds. Their hardware and control software are proprietary, with either proprietary or open protocols used for network communication.
Remote terminal unit (RTU)
Remote terminal unit (RTU) based SCADA : RTU-based systems are common in the electric, gas and water distribution industries where monitoring and control must take place across large geographical distances.
![RTU Industrial Control Systems](https://instrumentationtools.com/wp-content/uploads/2019/07/RTU.jpg?ezimgfmt=rs:778x392/rscb2/ng:webp/ngcb2)
The RTUs were developed primarily to provide monitoring and control capability at unattended sites such as substations, metering stations, pump stations, and water towers. They communicate with a central station over telephone lines, fiber-optics, radio or microwave transmission.
Monitored sites tend to be relatively small, with the RTU typically used mainly for monitoring and only limited control. Hardware and software are proprietary, with either proprietary or open protocols used for data transmission to the central station.
Programmable logic controller (PLC)
Programmable logic controller (PLC) based systems: PLCs, which are described in greater detail in the next section, can be networked together to share data as well as provide centralized monitoring and control capability.
Control systems consisting of networked PLCs are supplanting both the plant DCS and the RTU-based systems in many industries. They were developed for factory automation and have traditionally excelled at high speed discrete control, but have now been provided with analog control capability as well.
Hardware for these systems is proprietary, but both control software and network communication protocols are open, allowing system configuration, programming and technical support for a particular manufacturer’s equipment to be obtained from many sources.
Golden Margins –Entire Range of Touchscreen Products
![This image has an empty alt attribute; its file name is Optical-Bonding-1_jpg-1024x641.jpg](https://goldenmargins.com/wp-content/uploads/2021/02/Optical-Bonding-1_jpg-1024x641.jpg)
![This image has an empty alt attribute; its file name is 55正-3-1024x616.jpg](https://goldenmargins.com/wp-content/uploads/2021/02/55%E6%AD%A3-3-1024x616.jpg)
We hope you found these touchscreen or panel PC fundamentals informative. Goldenmargins offers a broad selection of Industrial Touchscreen Monitors and Touch Panel PCs in various sizes and configurations, including medical touch screens, sunlight-readable touch screens, open-frame touch screens, and waterproof touch panels, as well as other unique touch screen or panel PC designs. You can learn more about our services HERE or by calling us at +86 755 23191996 or sales@goldenmargins.com
Comments (42)
reputable mexican pharmacies online
https://cmqpharma.online/# purple pharmacy mexico price list
pharmacies in mexico that ship to usa
best online pharmacies in mexico: cmq pharma – purple pharmacy mexico price list
online pharmacy india: online shopping pharmacy india – mail order pharmacy india
buying prescription drugs in mexico online: best online pharmacies in mexico – buying prescription drugs in mexico online
reputable canadian online pharmacies [url=https://canadapharmast.com/#]cross border pharmacy canada[/url] pharmacy in canada
http://indiapharmast.com/# indian pharmacy online
canada drug pharmacy: reputable canadian pharmacy – canadian pharmacy com
mexico drug stores pharmacies: mexico pharmacy – buying from online mexican pharmacy
certified canadian international pharmacy: best canadian pharmacy online – best canadian online pharmacy
https://canadapharmast.online/# canada pharmacy online legit
reputable canadian pharmacy: canadian pharmacy 24 com – safe reliable canadian pharmacy
canadian pharmacy 24 [url=https://canadapharmast.com/#]canadian pharmacy 365[/url] northwest canadian pharmacy
buying drugs from canada: vipps canadian pharmacy – safe canadian pharmacy
top 10 online pharmacy in india: mail order pharmacy india – reputable indian pharmacies
http://foruspharma.com/# mexican border pharmacies shipping to usa
mexican pharmaceuticals online: mexico drug stores pharmacies – mexican online pharmacies prescription drugs
my canadian pharmacy rx [url=https://canadapharmast.online/#]www canadianonlinepharmacy[/url] reliable canadian pharmacy
canada pharmacy world: canadian drug pharmacy – canadian pharmacy uk delivery
http://amoxildelivery.pro/# price for amoxicillin 875 mg
http://ciprodelivery.pro/# buy generic ciprofloxacin
paxlovid cost without insurance [url=http://paxloviddelivery.pro/#]Paxlovid over the counter[/url] paxlovid pharmacy
amoxicillin price canada: amoxicillin buy no prescription – can you buy amoxicillin over the counter in canada
https://amoxildelivery.pro/# amoxicillin 500 mg where to buy
http://clomiddelivery.pro/# can i order generic clomid without insurance
Paxlovid buy online [url=http://paxloviddelivery.pro/#]paxlovid cost without insurance[/url] paxlovid generic
https://ciprodelivery.pro/# cipro pharmacy
buy cipro cheap: antibiotics cipro – cipro
http://clomiddelivery.pro/# can you get cheap clomid
can i purchase clomid without prescription [url=http://clomiddelivery.pro/#]get cheap clomid without a prescription[/url] how can i get cheap clomid without dr prescription
http://clomiddelivery.pro/# where can i buy cheap clomid price
https://clomiddelivery.pro/# cheap clomid online
cheap clomid tablets [url=http://clomiddelivery.pro/#]where to buy generic clomid without insurance[/url] can you get cheap clomid without prescription
can i purchase cheap clomid: clomid without dr prescription – clomid generic
http://doxycyclinedelivery.pro/# doxycycline pills for sale
http://ciprodelivery.pro/# buy cipro online canada
amoxicillin 500 mg tablets [url=http://amoxildelivery.pro/#]amoxicillin 500 mg capsule[/url] purchase amoxicillin online
http://ciprodelivery.pro/# ciprofloxacin generic
doxycycline tablets canada: doxycycline for sale online – can you buy doxycycline over the counter nz
https://doxycyclinedelivery.pro/# doxycycline 20
http://amoxildelivery.pro/# buy amoxicillin online no prescription
where can i buy clomid without rx [url=https://clomiddelivery.pro/#]buying clomid tablets[/url] buy clomid no prescription
http://ciprodelivery.pro/# cipro for sale
medicine amoxicillin 500mg: amoxicillin 500 mg capsule – where can i buy amoxicillin online
https://ciprodelivery.pro/# buy cipro cheap
amoxicillin buy no prescription [url=http://amoxildelivery.pro/#]amoxicillin script[/url] amoxicillin 500 mg tablet price
http://doxycyclinedelivery.pro/# cost of doxycycline prescription 100mg
http://amoxildelivery.pro/# buy amoxicillin
cheap clomid prices [url=http://clomiddelivery.pro/#]can you buy cheap clomid without prescription[/url] where can i get cheap clomid
buy amoxicillin online no prescription: buy amoxicillin without prescription – buy amoxicillin without prescription
can i buy generic clomid without prescription: can i get clomid pills – can i purchase clomid no prescription