Transcript Programmable Logic Controllers, Quality And Quality Control.

Xavier Chaney
PROGRAMMABLE LOGIC
CONTROLLERS, QUALITY AND
QUALITY CONTROL.
What Are PLC’s??
 Programmable Logic Controllers (PLC) are
special-purpose computers designed for use
in the control of a wide variety of
manufacturing machines and systems
 PLC’s have many if not limitless control
applications
 Turning on/off pumps/motors
 Timing, counting, and calculating
 Monitoring and managing systems
What Are PLCs (cont.)
Advantages of PLCs
 Reliability
 Faster and Improved troubleshooting and
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maintenance
Offline Programming
Online Programming
Low Cost
Control grows exponentially
How PLC works?
 PLCs operate by a program or language
better known as ladder logic.
 The ladder logic consists of usually 2 or more
rungs, input instructions (such as switches
and sensors), and output instructions (pumps,
motors, pilot light, and alarms)
 One the switch is actuated the current flows
from left to right completing all of the
commands concerning the logic which can
vary.
How PLC’s Work (cont.)
How do PLCs Enhance Quality
and Quality Control?
 PLCs can be programmed to actuate if
reaching a certain temperature or limit
 This can be very helpful with materials or goods
that are sensitive to contaminations and/or
sensitive to pressure
 This can improve the output of goods that are
produced
How is Quality Control
Monitored?
 The inputs and outputs are monitored by the
PLC itself.
 This can be helpful for technicians, supervisors,
and managers.
 This is easier to troubleshoot and modify issues or
problems, improving the percentage of quality
goods.
References
 Regh, James A., and Glenn J. Sartori.
Programmable Logic Controllers. 2nd ed.
Upper Saddle River: Pearson Education,,
2009. Print.
 "PLC." Web. www.yahoo.com