Overview of PLC and PNP vs Sourcing - 1.pptx

Overview of PLC and PNP vs Sourcing - 1.pptx

1. Shift Incharge : Talha Arshad Electrical-DRM Overvieew of PLC

2. WHAT IS PLC

3. WHAT IS PLC A PLC is a digital operating electronic apparatus which uses a programmable memory for internal storage of instruction for implementing specific function such as logic, sequencing, timing, counting and arithmetic to control through analog or digital input/output modules various types of machines or process.

4. BEFORE THE PLC One of the means for controlling machines was through the use of; Relays Logic Power Relay Control Relay

5. BEFORE THE PLC What are the disadvantages of relay and control based control systems? Complexity, Costly Hardwiring, Logistical nightmare Troubleshooting problems Strict Maintenance routine Not easy to modify Etc

6. ADVANTAGES OF PLC Higher reliability More flexibility as changes can be made within program Cost effective for controlling complex systems Easier programming and troubleshooting Faster response time Immune to electrical noise Resistance to Vibration

7. PLC OVERVIEW Power Supply Power Supply Power Supply Central Processing Unit User Memory INPUT Module Output Module Data Memory Optical I s o l a t i on Optical I s o l a t i on Communication Protocal

8. PLC CONTROL LOOP (P L C ) i s an ind u s tr i a l c o mpu t er c o n t r ol system that automate processes by: Read Inputs Program Scan Energizes the Outputs Continuous Cycle Read Inputs Program Scan Operates Output Continuous Cycle (in ms) Control Loop (Scan Cycle)

9. WHAT DEVICES DOES A PLC ELIMINATED? TIMERS-These also do not physically exist. They come in many varieties and increments. The most common type is an on-delay type. Others include off-delay and both retentive and non-retentive types. Increments vary from 1ms through 1s. COUNTERS-These again do not physically exist. They are simulated counters and they can be programmed to count pulses. Typically these counters can count up, down or both up and down. Since they are simulated they are limited in their counting speed. Some manufacturers also include high-speed counters that are hardware based. We can think of these as physically existing. Most times these counters can count up, down or up and down.

10. OUTPUT RELAYS-(coils)These are connected to the outside world. They physically exist and send on/off signals to solenoids, lights, etc. They can be transistors, relays, or triacs depending upon the model chosen. DATA STORAGE-Typically there are registers assigned to simply store data. They are usually used as temporary storage for math or data manipulation. They can also typically be used to store data when power is removed from the PLC. Upon power-up they will still have the same contents as before power was removed. Very convenient and necessary!! WHAT DEVICES DOES A PLC ELIMINATED?

11. SIEMENS PLC SERIES Compact PLC with Onboard I/Os Micro PLC for lower performance range Software: Step 7 Microwin Cable/Interface: PPI / Profibus Compact Or Modular PLC Medium and Low end performance range S o ft ware: Si matic Ma n a g er Cab le / I n terface: MPI / Profibus High performance and medium range Modular PLC F or Process a u t o m a t i o n DCS Applications Software: TIA Portal High and medium end performance S7-400 S7-300 S7-200

12. S7-1500 S7-1200 Medium and Low end performance range C om p act PLC with o nb o ard I/Os Software: TIA Portal Cable: Ethernet High and medium end performance Profinet Advanced and Modular controller High and medium end performance Highest system performance Software: TIA Portal Cable / Interface: Ethernet / Profinet ET-200 with i nt eg ra t e d CPU Distri b u ted I/O with or without CPU Modular PLC High and medium end performance Software: TIA Portal Cab le / I n terface: E t h ernet / Profinet Rana Muhammad Awais | www.automationplay.com | [email protected] | Facebook.com/automationplay | Youtube: Rana Muhammad Awais SIEMENS PLC SERIES

13. THANK YOU