It is very simple and easy to understand. Thank you for sharing this with us. Because, it must had take some your time and energy.
Thanks, Rajesh for the correction. This is very interesting thank you very much if could you be able to send it to me via email Reply. Hi, soon I will start sending the newsletter with my articles. Kindly share your email. Nice Maam Reply. Thank you, mam Reply. Thank You for your piece. Very very useful information Reply. Thank You. Thank You Reply. Welcome, Buddika. Thanks for sharing Reply. My pleasure. Updated more questions. Thank you very much, it was very helpful, I will refer to my friends and co-workers.
Thank you Reply. And thanks for sharing this post in your network. Really informative Thank-you Reply. Tandai Reply. Informative indeed Reply. Thanks, Simon: Reply. If have such types of question then please forward my email [email protected] Reply.
Yeah sure! Thanks for sharing your mail. Good questions. Thank you! Please share such articles to my email [email protected] Reply. Sure, Pradip. Soon I will start sending the newsletter with my articles.
Good Knowledge!! Thanks, Muhammad. Can we do? Hi Arvind, Can you please elaborate, what chip you are talking about? Hello Madam, This article is really very nice. Thank you very much, Asif for giving a piece of updated information.
Definitely, I will add these two PLC brands. Very good tutorial. It is in simple a self contained box with communication ports and set of terminals for input and output devices. 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 plant electricians.
Troubleshooting is simpler and many PLCs are designed to include fault details and written fault details on display screen. It requires lesser and simpler wiring compared to conventional hard wired circuits employed. Hence reliability of the system increases significantly with PLCs More Flexibility: It is easier to create a new program module or change an existing program in PLC compared to hard wired circuitry system. These software program modules can be changed whenever required.
Use can modify the programs in the field and if required, security can be enhanced by hardware interlocks such as key locks and software features such as passwords Lower Cost: PLCs were originally designed to replace relay control logic which is not economical and complex especially for large control circuits. With PLCs the cost savings have been so significant that the relay control becomes uneconomical except for some power applications.
Generally if the application consists of more than half a dozen control relays, PLCs are least expensive to install Communication Capability: Communication capability of PLC with the other controllers and computers in the system is one of the main advantages compared to relay control circuit.
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: PLCs are designed for high speed and for the real time applications.
Response time for PLCs are much smaller compared to relay logic circuits. The programmable controllers operates in real time i.
PLCs purpose is to monitor the process parameters located at the field and adjust the outputs based on the inputs received by the PLCs.
PLCs will operate on any systems which will have input field devices that are On-Off type discrete or digital or analog input devices.
Similarly it will operate on the field devices which will be discrete or analog output type. In simple words, Hence PLC acts as interface between the input and output devices at the process side of the industries.
It monitors the inputs receive from the input devices and takes necessary output control functions by executing the programs stored in its memory. RS Linx software is renowned for performing tasks such as downloading, uploading, updating firmware, going online, sending messages and more. In general, PLCs are smaller and cheaper compared to the Relays. They are also economically more stable than that of relays and they are very useful commercially. The PLCs are highly reliable and extremely easy to program which is often not the case with hard-wired relays.
In simple words, PLCs can sustain in any kind of robust environment even with low maintenance but hard-wired relays are extremely specific in use. Use of a ma signal results in easy detection of a cable break by the PLC. This is because it only returns 0 ma. On using a ma signal, the PLC loses its ability to detect any cable break. Since the return value is 0 ma which is the same as input, the PLC thinks that the signal is working perfectly.
That is why ma is preferred over ma. Online Training Programs. In conclusion: The above-mentioned questions are the most common ones with respect to the technical aspects. Subscribe Our NewsLetter. Subscribe Now. Join Onlineinterviewquestions. Support us by disabling your adblocker.
Please Reload the page once you disabled the Adblocker. Git Interview Questions. GWT interview questions. Matlab Interview Questions. OpenGL Interview Questions. They are least affected by the electrical noise and are inherent to electrical noise Programming in PLCs is through Relay Ladder Logic or other easily learned language. PLCs comes with program language built in its memory. PLCs do not contain input and output devices such as keyboards, mouse, monitor, CD drives and other hard disks.
It is in simple a self contained box with communication ports and set of terminals for input and output devices. 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 plant electricians.
Troubleshooting is simpler and many PLCs are designed to include fault details and written fault details on display screen. It requires lesser and simpler wiring compared to conventional hard wired circuits employed. Hence reliability of the system increases significantly with PLCs More Flexibility: It is easier to create a new program module or change an existing program in PLC compared to hard wired circuitry system.
These software program modules can be changed whenever required. Use can modify the programs in the field and if required, security can be enhanced by hardware interlocks such as key locks and software features such as passwords Lower Cost: PLCs were originally designed to replace relay control logic which is not economical and complex especially for large control circuits.
0コメント