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PLCBROCHURE

SUPREME & CO. PVT. LTD.

53, Justice Chandra Madhav Road, Kolkata - 700020. India.

The contents of this catalogue should not be copied or reproduced without prior written consent of SCPLPh: 91-33-24748575 / 7565 | Fax: 91-33-2476-1955

Email: [email protected] | www.supreme.in

53, Justice Chandra Madhav Road, Kolkata - 700020. India.Ph: 91-33-24748575 / 7565 | Fax: 91-33-2476-1955

Email: [email protected] | www.supremeco.com

The contents of this catalogue should not be copied or reproduced without prior written consent of SCPL

Programmable Logic Controllers

A digitally operating electronic apparatus which uses a programming memory for the internal storage of instructions for implementing specific functions such as logic, sequencing, timing, counting and arithmetic to control through digital or analog modules, various types of machines or process.

Advantages of PLCs• Smaller physical size than hard- wired solutions• Wiring between devices and relay contacts are done in the PLC program.• Easier and faster to make changes.• Easier and faster troubleshooting. • Reliable components enable PLCs to last for years before failure.

Major Components of a Common PLC1. POWER SUPPLY2. CPU 3. I/P MODULES4. O/P MODULES5. COMMUNICATION INTERFACE

PLC in Distribution Automation DAS consists of the remote/automatic switching devices for overhead and underground distribution lines, and the computer system to monitor and control. If a fault in the distribution network occurs, the system detects the faulted section of the distribution network, isolates the faulted section, and recharges the some of the un-faulted parts of the network, all by automatic operation. By remote operation from the control office, other parts other than the faulted section are energized. All the operations in distribution automation is done by the following:- PLC, HMI, RTU,IED, DRIVES, SCADA, DCS etc.



CPU

I/P MODUL

E

O/P MODUL

E

COMMUNICATION INTERFACE

A/D CONVERTOR PROGRAMMER

MONITOR


Sl. No. Relay Control Panel PLC1 Editing the logic is difficult given the hard

wired logic circuit.Easier and faster to make changes.

2 Coil failure contact where various sources of contamination are some reasons which cause failure.

Applications can be duplicated faster and less expensively.

3 Identification & location of relay faults and switches is difficult.

Diagnostics are centrally available.

Some Industrial Application of PLC System1. On/off of lamp2. Start/ stop of a Motor3. On/ off a Lamp using buttons4. Combination of Switches to on a Switch5. On/off a Pump6. Flashing of Lamp7. Auto on/off Door Lamp8. Traffic Signal9. Door Bell Alarm & Glass Break Detector10. Bottle Counting Application etc.

Automation Projects currently under Development

1. Automatic Glue Gritting of helical wire model using PLC:

The PLC-based model on display has been made by the engineering team at Supreme & Co. Pvt. Ltd. and is one of the “Proofs of Concept” for the myriad of automation solutions the company is looking to provide in the near future.

In this model, the objective is the glue gritting of helical wires without the use of manpower thereby eliminating the possibility of human errors. The model uses four electromagnetic relays and associated pneumatic valves operated by a PLC to perform the required operation on the helical wire. A pneumatic plunger driven by a compressor conveys linear motion to the helical wire. The force and the timing of the plunger is controlled through 2 electromagnetic relays that control the air pressure through 2 corresponding valves. The flow timings of the glue and the grit on the remaining valves are also controlled by the PLC and are synchronized to match the movement of the helical wire. All the operations can be controlled precisely and conveniently through programming on the PLC.




2.Automatic lighting control using PLC:

Our WIP projects also include an Automatic lighting system that requires no switches, i.e. automatic switching on/off of lights as per the presence of people in the room. IR sensors are used to detect entry/exit of people into the room and the circuit additionally maintains a count of the number of people in the room at any given time. The sensors are strategically placed to differentiate between entry and exit of the people. Depending on the number of people passing through the door the counter goes up/down and stores the corresponding value in the register which is referred to by the comparator which controls the tripping of the lighting circuit accordingly. The light will come on as soon as the first person enters the room and does not switch off until and unless the counter value drops to 0. This project has been developed using an analogue circuit whose block diagram is shown below. The transition to PLC control is convenient and is earmarked as the next phase in the project.



Up/Down

Counter

Register

Comparator

IR Light Sensor

Relay

7 segment Display

Output

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