PLC - Memory Map

The memory is divided into three parts: program, word and discrete registers. The program (ladder logic) and word registers are usually stored in FLASH memory, while the discrete registers are stored in RAM memory.

PLC Data Types

There are basically two types of data; discrete and word data. Discrete data is one bit that can be either a '1' or a '0'. Discrete data is used for keypad button inputs and lighting circuit outputs. Word data is 16-bits that represent a fixed or variable number. For example, word data is used for interval timers and any other mathematical calculations.

PLC Registers

PLCs offer a fixed amount of registers, depending on the model and configuration. Most modular PLC registers are counted in octal. Its easier for PLCs to count in groups of eight then ten, because eight is an even power of 2.

LCD Display Panel for PLC Programming

Assigning various inputs/outputs and functions is done through the LCD display and keypad panel by entering pre-assigned codes.

Volume Control with Prog Logic Controller

The PLC allows the homeowner to control not only the lighting and drapery systems, but also the audio volume levels in every room from one single keypad.

PLC Communicates RS-232

PLC's have communication ports that can be configured to talk all kinds of protocols. One of the most useful in home systems is the ASCII In/Out non-sequence protocol.

Volume Control with Prog Logic Controller

PLC's have communication ports that can be configured to talk all kinds of protocols. One of the most useful in home systems is the ASCII In/Out non-sequence protocol.

Programmable Logic Controller Security

Integrating the security system with the PLC lighting control system creates a more secure home environment, when the homeowners are away or at home.

Programmable Logic Controller Application

The programmable logic controller (PLC) allowed for the integration of three basic electrical systems: lighting, drapery and audio. It also allowed for all of the systems to be controlled from one common wall station, thus eliminating the conventional switch wall clutter.

Low Volt Keypads

The Programmable Logic Controller is the 'brains' of the electrical control system but it still requires inputs from other sources, like low voltage keypads, to solve the complex switching requirements of today.

Electrical Switching Using A Programmable Logic Controller

The Programmable Logic Controller is the solution to today's electrical switching requirements. The PLC is as reliable as a traditional switch, but has the ability to solve the complex switching requirements of today.

Programmable Logic Controllers - Timing Function

The Programmable Logic Controller (PLC) is a computer which can do timing functions. The timer instruction can be used to time events or create delays in residential applications. An example of a timer function is in the control of the garage light; on when the garage door is open and off 5 minutes after the door is closed.

PLC Lighting Control

"Using the PLC as the lighting control eliminates the toggle switch wall clutter, by replacing it with a low voltage switching solution. The low voltage keypad is a momentary contact device with multiple buttons."

PLC Applications

"The application program is written in a language called ladder logic. Ladder logic comes from the electrical industry when relays were used to control equipment. Relays were energized from a power rail through a series of contacts that formed a rung. A number of rungs in turn formed a network."

PROGRAMMABLE LOGIC CONTROLLERS

A programmable logic contoller (PLC) is a solid-state device with digital processing capabilities designed for real-time control of residential applications. A PLC comprises of input and output units (I/O) and a central processing unit (CPU).The input and output components are built into the same physical box with the CPU. The package provides a small, light-weight, low-cost, and self-contained solution for a wide range of control applications.

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