The main difference between Programmable Logic Controller (PLC) and Distributed Control System (DCS) are: The number of I/O in the system. Does the system reduce engineering time for my applications? Both DCS and PLC can be configured or reconfigured. DCS is mainly used to handle anolog IO's and PLC's for digitaly . When configuring a tag, everything required is there to connect it to a field point and apply alarm logic, history, version control and other functions, saving time and improving quality. The automotive industry is still one of the largest users of PLCs. One thing is clear, process users are getting more options to consider. This level of optimization is high level, multivariable control based on real-time business management goals, actual feedstock information, production demand, and energy costs - all in an effort to optimize plant profits. DDC : DDC is a universal controller where both analog and digital input/outputs are combined in one controller card also it is specially designed for the HVAC ( Heat ventilation air conditioning) design which are used for air handling unit. Bosch Rexroth precision modules meet requirements for clean production, Precise miniature slide guides from NB Corporation, The top 10 linear motion articles of 2020, Identifying Best-Value Linear Motion Technologies, Learn how to reduce noise and distortion in encoders’ signals, Helical Planetary Gearboxes: Understanding The Tradeoffs, Tweets from https://twitter.com/Motion_Control/lists/motion-control-tweets. Programmable Logic Controller (PLC) also known as Industrial Computer is the major component in the industrial automation sector. Many agree that the beginning of the DCS started with the introduction of the Honeywell TDC 2000 in 1975. Does the system reduce process control configuration time? It means PLC is a sub system of a large system called DCS. Since the PLC was integrated with Analog I/O it crosses the boundary of being just digital and crosses to the realm of DCS in handling Analogs, Bus Systems, Distributed I/O and etc. DCS backbone networks are typically standard Ethernet hardware but use their own closed,high-performance protocols and natively support redundancy. turn the clock back 10 years: The programmable logic controller (PLC) is king of machine control while the distributed control system (DCS) dominates process control. There are plants where PLCs or DCSs control all of the plant functions but at this point these are the exceptions. LINAK launches the world’s first electric linear actuator with IO-Link. SCADA is a system that relies on computers, software and communication media to remotely monitor and control devices in a control system, usually large-scale. Integration with the enterprise is becoming very important to improve operations and maximize asset management. The difference between distributed control systems (DCSs) and programmable logic controllers (PLCs) can be boiled down to a simple football metaphor. Consider that mobile phone shipments in 2010 were 1.39 billion, up 18.5% from the 1.17 billion units shipped in 2009. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media. Computer-based process control systems before the TDC 2000 were mainly data collection and alarm systems with controlled done by pneumatic loop controllers and standalone electronic PID controllers. For instance, PLCs are faster and can handle more complex control. To sum up this post, the difference between the PLC and SCADA is as follows. Using same data base server you can edit in logic as well as on graphics screen. DCS is a relatively large system while the PLC is a small system. These days, there is probably no single factory in the word that d… WTWH Media LLC and its licensors. Advantage SCADA. Logic means the discrete / sequence function is usually handled by the relay. The primary logic offered for using a single PLC-based system rather than a DCS for process functions along with PLCs for discrete functions is to have one control architecture for the entire plant. (SAP, Oracle, etc.). PLCs were originally designed to replace relay control systems and their low relevant cost made them ideally suited for production automation and machinery. In my opinion, this is not a rational engineering approach when configuring plant systems for performance and reliability. Rating: (2169) Hello Viana; I would say: Less and less difference every day, now. Advantage DCS. DCSs were traditionally used to control large processes, while PLC systems were used to control machines. Concerned about safety? Well, I think DCS - Distributed Control Systems - is a control device that has higher capabilities compared to an ordinary PLC. If the vendor tells you this can only be done by taking a training course on their product, don’t walk…run away from this supplier. The function or intent of traditional PLCs was to provide a stand-alone control system that was economical and very efficient at processing various I/O types. It can be seen from the name: PLC is named after function, and DCS is named after architecture. Major worthy advantage of DCS is having centralised database server. These other protocol interfaces are typically accomplished with third party interfaces where the software configuration is more cumbersome. DCSs have been the primary solution for process automation but now many PLC vendors are arguing that a single integrated architecture based on PLCs and/or PACs is the best approach to total plant automation. This investment upfront can save a large amount of money and lost production time over the life of a system. Many process control systems require redundancy for I/O, controllers, networks, and HMI servers at various levels. If you manufacture plastic widgets, you speak PLC. of I/O with less cost. The need to connect to multiple industrial networks is a necessity and virtually all process plants utilize multiple discrete and process industrial networks including DeviceNet, Profibus, PROFINET, EtherNet/IP, Modbus TCP, HART, and Foundation Fieldbus. For example, a historian may be added to many PLC products by plugging a module into the backplane that acquires data from the controllers, but history communications is done over a separate Ethernet connection. 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