Programmable Controls
Description
Programmable controls or programmable logic controllers (PLC) are microprocessor based industrial computer systems for providing automation to electromechanical processes. Multiple inputs, outputs and other circuitry system are used to simulate the relays and switches for controlling the equipment in a process. They are programmable by using computer interfacing software through proprietary languages and with other network options. These programs which are used to control a machine’s operation are temporarily stored in a non-volatile memory. Programmable controls are designed to suite multiple input and output setups, resistance to impact and vibration and to withstand a wide range of working temperatures.
Software used for PLC
Programmable logic controllers use different software for operation. Some of them are given below:
Specifications
The specifications to be considered for I/O channels of PLCs are:
Total number of points - Sum of inputs and outputs
Expansion of I/O channels - For increasing the total control capacity, the units may be connected together
Total number of I/O channels – Final number of I/O channels after expansion
Scanning time - Time taken by the PLC to check its inputs and outputs
Memory Data - Total capacity for storing data
Program memory - Capacity for control software
Advantages
The advantages of programmable controllers are:
Applications
The applications of programmable controllers are:
Used for controlling machines on assembly lines, controlling amusement rides or light fixtures
PLCs are used in wide range of industries like semiconductor, automobile, process
view allRelated Headlines
- How To
null more »
- Problem Solvers
A new heat treating system from Can Eng Furnaces uses Allen Bradley ControlLogix programmable automation... more »
- Q and A
An IEN interview with Rockwell Automation's Logix/NetLinx more »
- Tech Topics
Today, a new type of control system -- programmable automation controllers -- offers significantly more... more »