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Feb 21
2012

The PLC Never Reprograms Itself

Posted by IAMBlogger in Troubleshooting , Tips and Techniques

IAMBlogger

The other week, our product autostrapping system went haywire.  One of its sequences got mixed up and and was doing it 'before' instead of 'after'. The strap bayonet (a channel that extends underneath the product  to provide a pathway for the strap and then feeds before tightening it, retracts then position itself unto another side for another strap) was extending all the while it is moving to another position resulting in the bayonet hitting the product and getting bent and shearing its bolts.

Since the the system was run by a programmable logic controller, a group of maintenance personnel decided to disable one output bit as they are concluding that there was something wrong with the program. It made the machine run like normal though. But one colleague and I was thinking otherwise (me and that guy is not assigned for that problem, we are working somewhere else).

Lessons in Instrumentation

In order to understand industrial process control and automation smoothly, it is a requisite to understand each of the fields of industrial instrumentation which act as the senses and the arms and legs of the entire process control and automation concept. Click on one of the header articles of the Lessons in Instrumentation below:

 Mathematics for Industrial Instrumentation    Industrial Physics  •  Chemistry for Instrumentation    DC Electricity  •  AC Electricity  •  Introduction to Industrial Instrumentation  •  Instrumentation Documents  •  Instrument Connections  •  Discrete Process Measurement  •  Discrete Control Elements  •  Relay Control Systems  •  Programmable Logic Controllers  •  Analog Electronic Instrumentation  •  Pneumatic Instrumentation  •  Digital Data Acquisition and Networks  •  FOUNDATION Fieldbus Instrumentation  •  Instrument Calibration  •  Continuous Pressure Measurement    Continuous Level Measurement    Continuous Temperature Measurement  •  Continuous Fluid Flow Measurement    Continuous Analytical Measurement     Machine Vibration Measurement  •  Final Control Elements - Control Valves  •  Final Control Elements - Variable Speed Motor Controls    Principles of Feedback Control    Process Dynamics and PID Controller    Tuning  •  Basic Process Control Strategies  •  Process Safety and Instrumentation  •  Instrument System Problem-Solving 

Tony R. Kuphaldt

Automation Online Books

Profibus Technology and Application

Profibus Technology and Application

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Data Communication and Computer Network

Industrial Control Handbook

Industrial Control Handbook

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