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All the symbols in the relay logic represent actual components and contacts present in the system, but the inputs\outputinstructionin PLC ladder logic represent only data values stored in the PLC memory.

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βˆ™ 11y ago
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βˆ™ 8y ago

relay coils are driven by current and PLC logic levels are voltages

relay coils typically get quite warm from this current flow when held a long time but as most PLCs are CMOS they do not heat up when held, instead they heat up when switched rapidly

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Q: What are the differences between plc solution and relay ladder logic solution?
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Difference between ladder logic and relay logic?

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What is the difference between a PLD and mixed logic gates?

Answering "What is differences between pld and mixed logic gatessuch as the 7400 7432 ic logic device name one pld device?"


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Programming Logic Controller is a controller, which gets input from sensors,read/limit switch and controls the output according to the Ladder logic program.


What is ladder programming?

Ladder programming is used in Programmable Logic Controllers (PLC's) and is designed to be easily understood by engineers who are used to relay systems. It uses symbols for relay coils, timers and contacts. The advanced capabilities of the PLC e.g maths and logic functions are not used.


Who created ladder logic programming language?

Although GM made the initial order with a company called Bedford to develop a electronic replacement for relays which became the first PLC, The "Ladder" Logic which Graphically resembles contacts and relays was first done another company called Reliance Electric.


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Answering What is differences between pld and mixed logic gatessuch as the 7400 7432 ic logic device name one pld device?

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The comparisons between informal logic and formal logic?

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