In order for an analog voltage or current to be used by a PLC, a circuit called an Analog-to-Digital Converter (ADC) or a PLC analog input module is used.
Basically, the answer to the above question is simple. When conventional electrical switching fails to deliver today's and future control requirements.
A good lighting design at the beginning of a project will guarantee a reliable electrical system and a user friendly control system for the customer.
The memory card is a recent method for memory backup. Some new PLCs provide a slot for a memory card. The PLC ladder application program can read and write to the memory card.
The Programmable Logic Controller (PLC) with an Ethernet module acts as an HTTP Server (web content provider), which responds to requests from HTTP Clients (web browsers).
The Date/Time schedule is a feature in the PLC that gives the homeowner a higher level of control over his/her day to day switching needs.
By integrating the remote with the PLC, you can control the lights and curtains in the same room as the audio/video equipment.
The PLC is a versatile product that has many hardware options to accommodate the large number of different electrical interfaces out there. The PLC is modular in design so that one can mix and match the input/output (I/O) hardware requirements to meet the needs of the project.
The decision to use touchpanels should be based on the number of inputs and outputs (I/O) in the project. Projects that have a large number of lighting circuits, drapery motors, and whole house audio/video distribution with very little wall space for switches, definitely requires a touchpanel.
Remember to allow for other items, like a Lutron interface unit, to be mounted in the same PLC enclosure.
To the homeowner, this marriage of a PLC to a Grafik Eye system gives a very powerful and flexible electrical control system.
Entering variable codes could be done via a desk or laptop PC, but a more convenient way is via a LCD display panel.
With motorized drapery connected to the PLC, not only will the homeowner control the blinds from keypads on the wall, but can have them open or close depending on amount of sunlight coming into the room automatically.
PLC functions are programmed codes that define a connection between an input and a corresponding output.
With real number capability and transcendental functions one could incorporate a sunrise/sunset algorithm in the PLC to turn off or on lights in the morning or evening without having to use a photocell or pre set time clock.
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