Description
Overview
Essential details:P92 P9220436070H controller FOXBORO
The controller is composed of logic controller and microprogram controller. The two kinds of controller have their own advantages and disadvantages. Combinatorial logic controller is cumbersome in design and complex in structure. Once the design is complete, it cannot be modified or expanded, but it is fast. Microprogram controller is convenient in design, simple in structure, easy to modify or expand, modify the function of a machine instruction, only need to reprogram the corresponding microprogram; To add a machine instruction, just add a microprogram to the control memory, but it does so by executing a microprogram. The specific comparison is as follows: combinational logic controller, also known as hardwired controller, is composed of logic circuit, completely rely on hardware to achieve the function of instructions.
Electromagnetic sucker controller: The AC voltage 380V is depressioned by the transformer, rectified by the rectifier into 110V DC, and then entered into the sucker by the control device. At this time, the sucker is magnetized. When demagnetization, the reverse voltage line is passed into the controller to achieve demagnetization function.
Access controller: The access controller works in two modes. One is inspection mode, and the other is recognition mode. In inspection mode, the controller continuously sends query codes to the card reader and receives reply commands from the card reader. This pattern continues until the card reader senses the card. When the card reader senses the card, the card reader responds differently to the inspection command of the controller. In this reply command, the card reader transmits the code data in the sensor card to the access controller, so that the access controller enters the recognition mode. In the recognition mode of the access controller, the access controller analyzes the code in the induction card, compares it with the card data stored in the device, and implements subsequent actions. After receiving data, the access controller sends a command to the card reader to restore the status. At the same time, the access controller returns to the inspection mode.
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