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It consists of local control unit, low level interface, high level interface, shared communication facility Etc.
20 TOP PLC LAB VIVA Interview Questions and Answers
CPU is the brain of the system and consists of. Mention plc interview questions and answers pdf download four advantages of DCS. Viewers connect into servers and have full access to the collected data for viewing and control actions. In this process it updates all the outputs corresponding to the inputs. Generally if the application consists of more than half a dozen control relays, PLCs are least expensive to install Communication Capability: Good scalability and expandability.
Servers are responsible for the collection and distribution of data.
PLCs comes with program language built in its memory. Programmable Logic Controllers PLCs are the micro processor controller devices situated at the remote sites of the plant or at the field of the process systems. So that the process still can becontrolled manually. CPU plc interview questions and answers pdf download the brain of the system and consists of Microprocessor: Functions such as Supervisory control, data acquisition from the field, monitoring devices and process parameters associated with the field and downloading and uploading of programs can be easily possible with the PLC compared to hardwired circuits Faster Response: The programmable controllers operates in real time i.
Local control unit interfaces directly to the process. Unlike computers which performs numerous tasks simultaneously, PLCs execute a single program in an orderly and sequential manner from first instruction to the last instruction PLCs have been designed for installation and maintenance by plc interview questions and answers pdf download electricians.
PLCs were originally designed to replace relay control logic which is not economical and complex especially plc interview questions and answers pdf download large control circuits. It monitors the inputs receive from the input devices and takes necessary output control functions by executing the programs stored in its memory.
It requires lesser and simpler wiring compared to conventional hard wired circuits employed. Communication capability of PLC with the other controllers and computers in the system is one of the main advantages compared to relay control circuit. Computer requires a some software to process the information obtained from the input to generate an output which decide whether to close or open the valve position in the process side.
Predictive maintenance which allows proactive rather than reactive planning. Rrecording and monitoring of eventssequence and trends. What is the programmable language used in PLC? Programmable Logic Controllers are industrially hardened micro computers, designed to replace electromechanical relays, used to control machines and processes.
PLC SCADA DCS Interview Questions and Answers 2 | PLC, PLC LADDER, PLC EBOOK, PLC PROGRAMMING,
Similarly it will operate on the field devices which will be discrete or analog output type. Preserve your capital investment. PLCs are designed to operate under industrial environments PLCs have to operate plc interview questions and answers pdf download wide range of temperature conditions, humidity and other environmental conditions.
Measurement and questuons aquasition. PLCs will operate on any systems which will have input field devices that are On-Off type discrete or digital or analog input devices. Reduce your operating and maintenance costs.
It is based on a client server architecture consisting of servers and viewers. Integrate with your business systems.
To carry out arithmetic and logical operations Memory: PLCs purpose is to monitor the process parameters located at the field and adjust the outputs based on the inputs received by the PLCs. Comparing with Ijterview and alarm raising.
The electrical supply that converts the ac voltage to various DC operating voltages. Leave a Reply Cancel reply Your email address will not be published. PLCs have inbuilt diagnostics and override pdff that helps the user to easily trance the software and hardware errors. Installation Cost is lower than centralized system which performs the same function.