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  • Sep 22 / 2012
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Control and Field Instrumentation Documentation

To successfully work with (and design) control systems, it is essential to understand the documents that are typically used to illustrate process control and associated field instrumentation.

The documentation of process control and associated field instrumentation is normally created by the engineering firm that designs and constructs the plant. The company that commissioned the plant may have an internal documentation standard the engineering firm will be required to follow. Continue Reading

  • Aug 23 / 2012
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Programmable Logic Controllers and its Advantages

Programmable Logic Con­trollers

The modern solution for the problem of how to provide discrete-state control is to use a computer-based device called a programmable controller (PC) or programmable logic con­troller (PLC).

A PLC (i.e. Programmable Logic Controller) is a device that was invented to replace the necessary sequential relay circuits for machine control. The PLC works by looking at its inputs and depending upon their state, turning on/off its outputs. The user enters a program, usually via software, that gives the desired results. Continue Reading