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i would like to Mention Few Details about Power plants automation and control using PLC technology
1. Introduction Power plants control and automation is always a challenge for industry because electric power has such an important roll in the development of civilization. Upgrading from first automation systems (electromagmetic relays - cable logic) to modern systems that use Programmable Logic Controllers (PLC) is an important stage in the development of automation systems used in power engineering (generation, transport, distribution, consumption), followed by cost reduction. 2. Programmable Logic Controllers Process control systems have a hardware structure (and an aditional software component) that assures stability, accuracy and good transitions. These performances are realized by interconnection of PLCs and a central digital language. The Programmable Logic Controller is used for automation of industrial processes and replaces the circuits of sequential command in cable logic. A PLC (figure 1) is an example of a real time system since output results must be produced in response to input conditions within a bounded time, otherwise unintended operation will result. These structures can be connected with different peripheral devices: chart instruments, sensors, brakers, engines.
Compared to the systems with electromagnetic relays, PLCs have the next advantages: • The connections number is reduced with 80%; • Collapses are detected automatic, in a very short time; • PLCs can be connected to computers which makes it easier to modify the programming sequence of the system, without changing the connections between the PLC and the system; • The cost for implementing a control system is reduced; • PLCs realize distributed control of the systems; they are connected to a DCS (Distributed Control System) most of the time.
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