（厦门）仲鑫达自动化设备有限公司

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Controllers are divided into combinational logic controllers and microprogrammed controllers. Both controllers have their own strengths and weaknesses. The combinational logic controller is troublesome to design and has a complex structure. Once the design is completed, it cannot be modified or expanded, but it is fast. Microprogrammed controllers are easy to design, simple in structure, and easy to modify or expand. To modify the function of a machine instruction, you only need to reprogram the corresponding microprogram. To add a machine instruction, you only need to add a microprogram to the control memory. However, , which is performed by executing a mini-routine. The specific comparison is as follows: Combinational logic controllers, also known as hard-wired controllers, are composed of logic circuits and rely entirely on hardware to implement instruction functions.
Working Principle
After the AC voltage of the electromagnetic chuck controller is stepped down by the transformer, it is rectified by the rectifier and becomes DC, and then enters the chuck through the control device. At this time, the chuck is magnetized, and when demagnetized, it passes into the reverse voltage line. The controller reaches the demagnetization function.
Access control controller The access control controller works in two modes. One is the inspection mode and the other is the recognition mode. In the inspection mode, the controller continuously sends query codes to the card reader and receives reply commands from the card reader. This mode will remain until the card reader senses the card. When the card reader senses the card, the card reader generates different replies to the controller's inspection command. In this reply command, the card reader transmits the read inner code data of the proximity card to the access control controller, allowing access control. The controller enters identification mode. In the recognition mode of the access control controller, the access control controller analyzes the code inside the proximity card, compares it with the card data stored in the device, and implements follow-up actions. After the access control controller completes the action of receiving data, it will send a command to reply to the card reader to restore the card reader status. At the same time, the access control controller returns to the inspection mode.
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