1. Petroleum Instrumentation NGT 160
Basics Instrumentation
Chapter 12
Programmable Logic Controllers
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2. Programmable Logic Controllers (189)
A PLC’s solid state electronic components, reliability ,and flexibility make it ideally suited for harsh industrial environments.
Easily reprogrammed by a technician in the field.
A computer is the heart of a PLC.
Replaced old relay logic circuits
Today more complex and powerful
Can perform mathematical comparisons and multiply and divide and extract square roots.
Perform proportional, integral, and derivative (PID) functions.
Why it was named what it is named.

3. Programmable Logic Controllers (189)
Common building blocks of a PLC.

4. Programmable Logic Controllers (190)
Five major hardware components of a PLC.

5. Programmable Logic Controllers (191)
Ladder logic diagram (Boolean logic or ladder logic)

6. Programmable Logic Controllers (190)
Ladder logic diagram (Boolean logic or ladder logic)

7. Programmable Logic Controllers (192-195)
Logic numbering systems
Necessary for communication with computers
Computers cannot handle decimal numbers
Binary code developed – two states: on-off, etc.
Octal and Hexadecimal numbers.

11. PLC Measurement
Summary (205)
Review Exercise (205)