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Development and Application of Water Cutter Based on CAN Bus and CAN8423 Controller

Posted by: Yoyokuo 2022-05-05 Comments Off on Development and Application of Water Cutter Based on CAN Bus and CAN8423 Controller

Oil and gas will be mixed with some water and impurities in the process of production, storage and transportation. In order to ensure the quality of oil, the clear water must be cut to the prescribed standard in the storage container. The current conventional method is to set up all water valves at the bottom of the storage tank. Some water and impurities will be mixed in during the production, storage and transportation by manual operation. In order to ensure the quality of oil, the water in the storage container must be removed to the specified standard. .

Preface

Oil and gas will be mixed with some water and impurities in the process of production, storage and transportation. In order to ensure the quality of oil, the clear water must be cut to the prescribed standard in the storage container. The current conventional method is to set up all water valves at the bottom of the storage tank. Some water and impurities will be mixed in during the production, storage and transportation by manual operation. In order to ensure the quality of oil, the water in the storage container must be removed to the specified standard. .

The development and application of water cutters is undoubtedly an important contribution to the improvement of production technology and production automation in the petrochemical industry. It solves the problem of manual operation of oil tank dehydration in the petrochemical industry, and the separation of oil and water cannot be strictly controlled. The oil content of the drainage is relatively high, which causes the waste of oil and pollutes the environment. It overcomes the great safety caused by human misoperation. Hidden dangers.

Development and Application of Water Cutter Based on CAN Bus and CAN8423 Controller

The above picture is the upper computer running screen made with QTOUCH software. The entire Electronic control system is composed of probes, level gauges, solenoid valves, echoes and ICP DAS CAN8423 controllers, 87055W, 87017RCW. The upper computer is installed with ICP DAS The CAN200 series board is connected to the field CANBUS. Field sensor probe, the DI signal of the echo device is transmitted to 87055W, and the level gauge signal is transmitted to 87017RCW. The whole logic is judged based on the feedback signal of the field sensor, and then the solenoid valve is controlled through the DO output of 87055W.

1. Introduction to CAN Bus

The Controller Area Network CAN is a serial communication bus defined by ISO. It first appeared in the automotive industry in the late 1980s. Its basic design specifications require high bit rates, high immunity to electromagnetic interference, and the ability to detect any errors that occur. Because the CAN serial communication bus has these characteristics, it is naturally widely used in the automobile, manufacturing and aviation industries. The CAN communication protocol describes how information is transferred between devices. Its definition of layers is consistent with the open system interconnection model OSI. Each layer communicates with the same layer on another device. The actual communication occurs in each device. The two adjacent layers on the device, and the device only uses the physical medium of the physical layer of the model to interconnect CAN. The structure defines the bottom two layers of the model. The data link layer, the physical layer, and the application layer pass through different emerging protocol layers. Specially used in special industrial fields plus any suitable scheme and physical layer connection defined by individual CAN users. Perhaps the best CAN protocol industry standard is Allen-Bradley’s DeviceNet, which is designed for PLCs and smart sensors. The widely used CAN protocol industry standards in the world include CANopen and SDS. The physical medium includes a twisted pair with a specific terminal. In the BasicCAN specification, its transmission rate can reach 250KBaud, while PeliCAN can reach 1Mbaud. The physical layer and the data link layer are transparent to the system designer and are included in all components that implement the CAN protocol. These components include microcontrollers with integrated CAN interfaces, such as the Philips P97C591 processor compatible with 8051 and the 16-bit Philisp XA82C200 SJA1000. It is an independent CAN controller, which can directly interface with many microcontrollers, but with physical The media connection can be realized with separate components or 82C250 TJA1050 integrated circuits or similar methods.

  Development and Application of Water Cutter Based on CAN Bus and CAN8423 Controller

The network structure of the water cutter control system based on CAN bus is shown in the figure above. The system is composed of upper computer, CAN bus, and field device unit nodes. The host computer of the numerical control system controls any unit of the network node through the CAN bus. Sensors, actuators, or collecting digital and analog data are all ideal. They can be seen as remote attachments to a central microcontroller. The CAN interface adapter is the bridge between the host computer and the CAN8423 control unit for data transmission and control. The servo unit collects on-site data and transmits it to the host computer through the bus to realize real-time monitoring and control.

2. Module introduction

CAN8423 is one of the CANOPEN series products produced by ICP DAS. It supports CANOPEN protocol. It has 1 CAN port and built-in 80MHz CPU. The specific specifications are as follows:

CAN8423 has 4 expansion slots, users can choose 8K or 87K series DI/DO/AI/AO modules according to actual needs, install them on the expansion slots, expand the I/O channels of the device, and make the device in use The above is more flexible. The design of CAN8423 follows the CANOPEN specification, so the device provides different functions such as dynamic PDO, EMCY objects, error output values, and cyclic and acyclic synchronization.

Development and Application of Water Cutter Based on CAN Bus and CAN8423 Controller

Three, the scope of application

The core part of CANOPEN is to describe the device function through the object dictionary and record it in the EDS file format. It adopts the separate transmission of real-time data and service data to maximize the efficiency of real-time data transmission, flexible data transmission methods and powerful network management. ability. Once launched, it has been widely used, and has been widely used in the vehicle industry, industrial machinery, building automation, medical equipment, navigation machinery, restaurant equipment, laboratory equipment, scientific research and other industries.

  Development and Application of Water Cutter Based on CAN Bus and CAN8423 Controller

Four, concluding remarks

The CAN bus improves the reliability of the system and provides users with a more flexible system integration initiative. Its good openness and compatibility can adapt to various field control needs. In view of the many advantages of the CAN bus, the CAN bus will be widely used and promote the continuous development of automation-related industries.

The Links:   CM100E3Y-12E SKKT132-16