Foxboro P0926MX Robot Card

Description

PLC has the characteristics of strong universality, convenient use, wide adaptability, high reliability, strong anti-interference ability, and simple programming. The position of PLC in industrial automation control, especially in sequential control, cannot be replaced in the foreseeable future.

The composition of PLC is divided into two types in terms of structure: fixed type and modular type. Fixed PLC includes CPU board, I/O board, display panel, memory block, power supply, etc. These elements are combined into a non detachable whole. Modular PLCs include CPU modules, I/O modules, memory, power modules, backplanes or racks, which can be combined and configured according to certain rules.

Composition of CPU: The CPU is the core of the PLC and plays a central role in the nervous system. Each PLC has at least one CPU, which receives and stores user programs and data according to the functions assigned by the PLC system program. It collects the status or data sent by the on-site input device through scanning and stores it in the specified registers. At the same time, it diagnoses the working status of the power supply and PLC internal circuits, as well as syntax errors during the programming process. After entering operation, read instructions one by one from the user program memory, analyze them, and then generate corresponding control signals according to the tasks specified in the instructions to command the relevant control circuits.

The CPU is mainly composed of arithmetic units, controllers, registers, and the data, control, and status buses that connect them. The CPU unit also includes peripheral chips, bus interfaces, and related circuits. Memory is mainly used to store programs and data, and is an indispensable component of PLC. In the user’s opinion, it is not necessary to analyze the internal circuits of the CPU in detail, but there should still be sufficient understanding of the working mechanisms of each part. The controller of the CPU controls its operation, allowing it to read, interpret, and execute instructions. But the work rhythm is controlled by oscillation signals. An arithmetic unit is used for performing numerical or logical operations and operates under the command of a controller. Registers participate in operations and store intermediate results, which also operate under the command of the controller.

CPU speed and memory capacity are important parameters of PLC, which determine the working speed, IO quantity, and software capacity of PLC, thus limiting the control scale. The interface between the 1.4 I/O module PLC and the electrical circuit is completed through the input and output part (I/O). The I/O module integrates the I/O circuit of the PLC, with the input register reflecting the status of the input signal and the output point reflecting the status of the output latch. The input module converts electrical signals into digital signals and enters the PLC system, while the output module is the opposite. I/O is divided into modules such as switch input (DI), switch output (DO), analog input (AI), and analog output (AO). The commonly used I/O classifications are as follows: switching value: divided by voltage level, there are 220VAC, 110VAC, 24VDC, and divided by isolation method, there are relay isolation and transistor isolation. Analog quantity: Classified by signal type, there are current type (4-20mA, 0-20mA), voltage type (0-10V, 0-5V, -10-10V), etc. Classified by accuracy, there are 12bit, 14bit, 16bit, etc.

369-LO-0-M-F-E-0-0
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369-HI-R-B-F-E-H-E
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