Motor Start/Stop operation with trip indication lamp

Application:-There is one machine in the factory, we want to start/stop motor using push button g from the panel. Give motor ON lamp and motor trip lamp on the panel. When motor is running ON lamp should be ON and if motor trip due to some problem, trip lamp should be ON. Write the PLC program in LAD and FBD language.

Solution:-Here we will make PLC program in the PLC so operator can operate motor from the panel and get indication on the panel. And also we will take inputs signal and outputs for our application

Diagram:-

 

PLC Program:-Write the PLC program from above application using LAD diagram language.

PLC program explanation:-

As per our application we wrote PLC program. In this program we have considered following inputs and outputs for our application. We can use any make PLC for our application.

Inputs:-

Start Button:-I0.0

Stop Button:-I0.1

Trip Input:-I0.2

Outputs:-

Motor:-Q0.0

Motor On Lamp: Q0.1

Trip Lamp:-Q0.2

Network 1:-In this network we are starting and stopping motor by push button. By pressing Start (I0.0) motor can be started and by pressing stop PB (I0.1), motor (Q0.0) can be stopped.

Network 2:-In this network we wrote the logic for motor ON lamp or indication (Q0.1). SO when motor is running, Motor ON lamp is also ON.

Network 3:-For safety purpose we have considered here trip lamp (Q0.2). So when trip signal (I0.2) is ON, trip lamp is also ON.

Analog signal concept

Selecting sensors 0-10 VDC, 4-20mA and 0-20mA

What we will Learn……..

-Understand the concept of voltage and current sensor feedback

-Difference between voltage input signal and current input signal

-Why do we use 4-20mA signal instead of 0-20mA signal?

-Why do we use current signal instead of voltage signal?

-In the domain of straight position sensors, straightforward guidelines. Sure there are a wide scope of other sensor interface types available; propelled starting/stop, synchronous consecutive interface, various types of fieldbus, and so forth.

-In any case, direct position sensors with basic yields in spite of everything speak to probably 66% of all straight position sensors sold.

-While picking a basic yield position sensor, your choice all things considered comes down to straightforward voltage (e.g., 0 to 10 V), or basic current (e.g., 4 to 20 mA). So which would it be prudent for you to pick?

Difference between 0-10 V DC sensor and 4-20mA sensor

Selection of 0-10 VDC sensor in PLC system

-With respect to sensor interface signals, 0-10V takes after vanilla solidified yogurt or, in case you like, a Chevy Cavalier. It's very little, anyway it do what needs to be done'.

- It's typical, it's unmistakable, it's definitely not hard to research, and pretty much every cutting edge controller on the planet will recognize a 0-10V sensor signal. Nevertheless, there are a couple of downsides.

- Each and every basic sign are unprotected to electrical impedance, and a 0-10V sign is emphatically no exclusion. Devices, for instance, motors, moves, and "noisy" power supplies can start voltages onto signal lines that can degenerate the 0-10V sensor signal.

-Also, a 0-10V sign is powerless against voltage drops achieved by wire restriction, especially over long connection runs.

Selection of 4-20mA 0r 0-20mA sensor in PLC system

-A 4-20 mA or 0-20 mA signal, on the other hand, offers extended invulnerability to both electrical impediment and give mishap up long connection runs.

-Also, generally more cutting-edge present day controllers will recognize current signs.

-In the event that that wasn't at that point enough, a 4-20 mA signal gives trademark bumble condition area since the sign, even at any rate worth, is up 'til now powerful. Without a doubt, even at the over the top low end, or "zero" position, the sensor is so far giving a 4 mA signal. In case the value ever goes to 0 mA, something isn't right.

-The comparable cannot be said for a 0-10V sensor. Zero volts could mean zero position, or it could suggest that your sensor has halted to work.

-From time to time, 4-20 mA sensors can be insignificantly continuously costly appeared differently in relation to 0-10V sensors. However, the cost differentiation is getting dynamically smaller as more sensor types join current-yield capacity.

Inductive proximity sensor working and fundamentals

Inductive Sensors

Inductive sensors use flows incited by attractive fields to identify close by metal objects. The inductive sensor utilizes a curl (an inductor) to produce a high recurrence attractive field as appeared as shown in Figure. On the off chance that there is a metal item close to the changing attractive field, current will stream in the article.

This subsequent current stream sets up another attractive field that restricts the first attractive field. The net impact is that it changes the inductance of the loop in the inductive sensor. By estimating the inductance the sensor can decide at the point when a metal have been brought close by.

These sensors will detect any metals, when detecting multiple types of metal multiple sensors are often used.

Also read capacitive sensor