A PPT on Basic of Automation and PLC

1. INDUSTRIAL AUTOMATION

2. What is Automation?
Automation is basically the delegation of human control
function to technical equipment for:-
 Increasing Productivity
 Reducing Labour Cost
 Increasing Quality
 Increasing Safety in Working Condition

3. Industrial Automation
The use of computerized or robotic device to complete
manufacturing task
Plant
Field
Instrumen
t
Control System
Hardware
Control
Software
Control

4. PLC (Programmable Logic Control)
A PLC is an industrial computer used to monitor inputs, and
depending upon their state make decisions based on its
program or logic , to control (turn on/off) its output to
automate a Machine or a process.

5. PLC Operation Sequence
1. Self test: Testing of its own hardware
and software for faults.
2. Input scan: If there are no problems,
PLC will copy all the inputs and copy
their values into memory.
3. Logic solve/scan: Using inputs, the
ladder logic program is solved once
and outputs are updated.
4. Output scan: While solving logic the
output values are updated only in
memory when ladder scan is done,
the outputs will be updated using
temporary values in memory
Self Test
Input
Scan
Logic
Scan
Output
Scan

6. PLC Timer
All PLC’s have timer instructions. Timers are output instructions
that are internal to the PLC. Timers provide timed control of the
devices that they activate or de-activate.
Basic functions of timer:-
•Timers are used to delay an action.
•Timers are used to run an operation for a predetermined period
of time.
•Timers are also used to record the total accumulated time of
continuous or intermediate events.
Timer’s instructions:-
Timers consists of following parts: timer address, preset value,
timer base, and accumulated value, as shown in figure below.