Description :Allen-Bradley 1769-L23E-QB1B is a CompactLogix 5370 L2 package controller. It is part of the CompactLogix Programmable Automation Controller (PAC) product family, which has one (1) Ethernet and one (1) RS232 communication port built in. It has 512KB of embedded user memory and supports the installation of up to three (3) 1769 I/O modules.
controller (English name: controller) refers to the master device that changes the wiring of the main circuit or control circuit and changes the resistance value in the circuit to control the start, speed regulation, braking and reverse of the motor in accordance with the predetermined order. Composed of program counter, instruction register, instruction decoder, timing generator and operation controller, it is a “decision mechanism” that issues commands, that is, to complete the coordination and command of the operation of the entire computer system.
The 1769-L23E-QB1B controller is divided into combinational logic controller and microprogram controller, and both controllers have their strengths and weaknesses. Combinatorial logic controller design is troublesome, complex structure, once the design is completed, it can not be modified or expanded, but its speed 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, one simply adds a microprogram to the control memory, but it does so by executing a microprogram. The specific comparison is as follows:
The combinational logic controller, also known as the hard-wired controller, is composed of logic circuits and completely relies on hardware to achieve the function of instructions.
The basic working principle of the microprogram controller: according to the instruction opcode address (directly given by the instruction opcode part or through the decoder) to read the corresponding microprogram segment in the control memory (a microprogram segment corresponds to the function of a machine instruction), and then drive the corresponding hardware to complete the function of the instruction in accordance with the “control signal read by the control memory”.
In computer networks, controllers are mainly used to control and manage network devices, such as routers and switches. In these devices, the controller is responsible for processing packets from different network interfaces and forwarding them to the correct destination according to network protocols. At the same time, the controller is also responsible for managing device configuration and status information, as well as providing remote management and monitoring functions for network devices.
In addition, the 1769-L23E-QB1B controller also plays an important role in the field of industrial automation. For example, programmable logic controllers (PLCS) are important components used to control and monitor industrial automation equipment and systems. They control different types of equipment such as mechanical, electrical and hydraulic systems by reading input signals from sensors and actuators, enabling the control and monitoring of automated production processes.
In general, the 1769-L23E-QB1B controller has a variety of types and functions, and can be designed and selected according to different application scenarios and needs.