NJ501-4500

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NJ501-4500 Programmable Logic Controllers (PLCs) allow users to define specific automation tasks for industrial systems. With a PLC, users can program complex operations combining digital inputs, outputs, timers, counters, and analog communication like sensor systems. In the modern industrial system, the digital relay, hardware relay, and ladder logic are used as the programming elements to control and monitor user-specified automation tasks. This article will explain the application field and working principle of NJ501-4500 series programmable logic controllers.

Application Field

NJ501-4500 programmable logic controllers can be used for a variety of industrial automation applications including, but not limited to, machine automation and process automation. Within machine automation, a PLC can be used to control machine movements such as in an assembly line and to monitor various machine states such as temperature or pressure. Within process automation, a PLC can be used to control and monitor processes such as filling and packaging, as well as monitoring pressure and temperature in specific areas of a process.

Working Principle

NJ501-4500 programmable logic controllers use a relay or a ladder logic as the programming elements. The ladder logic forms the basis for the operation of the PLC. A typical ladder diagram consists of a vertical power rail, corresponding to the voltage of the PLC, and horizontal rungs, which represent the logic instructions. The rungs are composed of contacts and coils which control the flow of electricity, with contacts representing digital inputs and outputs, as well as analog inputs. All rungs must be connected back to the power rail in order to complete electrical circuits.

When the operator inputs instructions via the ladder program, the PLC evaluates the instructions, compares them to the present inputs, and then determines the output switches to be energized. The output device is then activated and the desired action is taken. The PLC is then ready to accept the next set of instructions. The PLC can also be programmed to accept timed commands, via a time base instruction, or repeat a specific action through counters. It can also accept analog values from an external automation system, convert the analog values to a digital code, and then use the digital code to control the process.

Conclusion

NJ501-4500 programmable logic controllers provide a compact and powerful solution for automation applications. These PLCs can be programmed to accept digital, analog, and timed commands, as well as utilize counters to repeat preprogrammed actions. The simple ladder logic language allows users to easily program and modify their automation tasks. With its flexibility and wide application field, NJ501-4500 programmable logic controllers are an excellent choice for many automation tasks.

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