Tuesday, June 28, 2011

The TEP PLC Hardware





The hardware of TEP PLC has been planned to be simple as possible though maintaining the significant aspects of the PLC of industrial. Connections to the inputs and outputs are prepared through the terminals of screwless, permitting fast modification to wiring. Onboard push buttons offer a simple way of modifying the states of input without connecting the switches or other devices of input. LED indicators demonstrate the present state of both inputs and outputs. At the same time, these features let easy carrying out tests to help the learning process.

Power Connections
The TEP PLC is motorized by a mains adaptor of 12V. The power supply of 12V plugs into the standard DC power connector on the PLC side. This supply power of 12V the internal PLC electronics, but it can be utilized with devices of input and output and so is also accessible at 3 locations via the screwless terminals. When powering external devices with the onboard 12V supply, care have to be taken not go beyond the rated output current of the mains adaptor.

Outputs
The TEP PLC contains a total of eight outputs. Every output can be linked to through a pair of screwless terminals. The outputs are isolated electrically from the internal electronics, therefore, no power is supplied directly from outputs. The pair of terminals is linked internally to the open contacts normally of a relay. While the output is on, the relay contacts close and there is a connection of electrical between the two terminals. While the output is off, there is no connection between the two terminals. Every output can easily be thought of as a switch.

The outputs are also cut off from each other, so can be utilized to switch different signals or power supplies. The simplest technique of powering a device from the PLC utilizes an output to switch the on-board supply of 12V. For instance, when the device of output is a 12V motor, the onboard 12V supply can be agitated throughout one of the motor outputs.

Inputs
The TEP PLC provides eight optically cut off inputs. An input is sensed as being on when a small current is transferred between the input terminal and the common terminal. Accomplishing this can be as simple as wiring a switch between 12V and the input, and wiring common to 0V. The system also enables transistor based sensors, like opto-switches to be straight connected to the PLC. The inputs are configured as two banks of four, with a common terminal for every bank (COMA and COMB).


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