Introduction to IEEE STANDARDS and its different types.pptx
PROGRAMMABLE LOGIC CONTROLLERS
1. Workshop on
“PLC Basics & Programming”
Prepared by- Rahul N Deshmukh
Asst Professor
E&TC Dept
2. Content-
• History
• Basics of Programmable Logic Controller (PLC)
• PLC hardware & software
• Inputs/Outputs
• PLC Programming Languages
• What is an Automation?
• Supervisory Control & Data Acquisition System (SCADA)
Rahul N Deshmukh E&TC Dept
SSBT's COET Bambhori Jalgaon
3. History-
In 1968, a group of engineers from General Motors developed the
concept of PLC with an initial specification. The PLC must be:
i . Easy to program.
ii. Not need rewiring the control system if change
the program.
iii. Smaller in size, cheaper and high reliability.
iv. simple construction and low maintenance
v. Cost- competitive
Rahul N Deshmukh E&TC Dept
SSBT's COET Bambhori Jalgaon
4. Development -
• Manual
• Contactor & relay based
• Logic gates
• Microcontroller based
• Programmable Logic Controllers
• Touchscreen & Wireless PLC’s
Rahul N Deshmukh E&TC Dept
SSBT's COET Bambhori Jalgaon
5. Advantages of PLC-
• Less wiring.
• Wiring between devices and relay contacts are done in the
PLC program.
• Easier and faster to make changes.
• Trouble shooting aids make programming easier and reduce
downtime.
• Reliable components make these likely to operate for years
before failure.
Rahul N Deshmukh E&TC Dept
SSBT's COET Bambhori Jalgaon
6. PLC Size-
• 1. SMALL - it covers units with up to 128 I/O’s and
memories up to 2 Kbytes.
- these PLC’s are capable of providing simple to
advance levels or machine controls.
• 2. MEDIUM - have up to 2048 I/O’s and memories up to 32
Kbytes.
• 3. LARGE - the most sophisticated units of the PLC family.
They have up to 8192 I/O’s and memories up to
750 Kbytes.
- can control individual production processes or
entire plant.
Rahul N Deshmukh E&TC Dept
SSBT's COET Bambhori Jalgaon
7. Applications-
• Manufacturing / Machining
• Food / Beverage
• Metals
• Power
• Mining
• Petrochemical / Chemical
Rahul N Deshmukh E&TC Dept
SSBT's COET Bambhori Jalgaon
12. Some PLC’s-
• 80% market is covered by
Siemens PLC
• Modicon is a first PLC
invented in france
• Messung & Delta are India
made PLC’s
Allen
Bradley
Siemens
Modicon Mitsubishi
Schneider
Electric
Messung
Rahul N Deshmukh E&TC Dept
SSBT's COET Bambhori Jalgaon
13. Block Diagram of PLC-
Rahul N Deshmukh E&TC Dept
SSBT's COET Bambhori Jalgaon
PROCESSOR
POWER
SUPPLY
I M
N O
P D
U U
T L
E
O M
U O
T D
P U
U L
T E
PROGRAMMING
DEVICE
From
SENSORS
Pushbuttons,
contacts,
limit switches,
etc.
To
OUTPUT
Solenoids,
contactors,
alarms
etc.
50. Types of Programming Software Languages
• Ladder Logic (LL)
• IEC Format
• Function Block Diagram (FBD)
• Structured Text (ST)
• Instruction List (IL)
• Ladder Diagram (LD)
• Sequential Function Chart (SFC) - also known as “Grafcet”
Rahul N Deshmukh E&TC Dept
SSBT's COET Bambhori Jalgaon
66. Hardware-Siemens S7-300
Software-Simatic Manager
-80% market occupied by Siemens
-STEP-5 & STEP-7 available with Siemens
-I/O Capacity (S7-200 )-32 analog & 256 digital
(S7-300)-256 analog & 1024 digital
(S7-400)-1500 analog & 128000 digital
Rahul N Deshmukh E&TC Dept
SSBT's COET Bambhori Jalgaon