![]() With this arrangement, several loads can then be connected to the CAN devices.Īctuator Actuator Access terminal Access terminal Access terminalĪ simplified model of this control system is shown in figure 3 below. From this Ethernet, connections are made to different Controller Area Network (CAN) devices. The layout involves four access terminals connected to an Ethernet. The layout model of the entire system, known as Isizoinyiama layout model, is shown in figure 2. It is left for the programmer to determine the duration of each light. Signal Indicator Panel: All the control indicators like: error A, error B, error C, error D, receive and transmit messages are displayed on this panel. But in this paper, Light Emitting Diodes (LEDs) were used as loads to provide the necessary animations. Loads: These are the devices to be controlled. The operator has to enter the address or identity of that CAN on any of the access terminals together with some appropriate codes. Operator or user wants to control a device connected to any CAN, Each CAN bus has an address which uniquely identifies it. It is a vehicle bus standard designed to allow microcontrollers and devices communicate with each other within a vehicle without a host computer. Since the typical industrial scenario used in this research is a chemical industry, the network to be provided is a Local Area Network (LAN) because the industry is assumed to be within 100 meters square.Ĭontroller Unit: The main device in this unit is the Controller Area Network (CAN). It is distributive in the sense that it ensures that any address which emanates from any of the access terminal servers uniquely identifies a particular CAN controller. Switching Unit: This unit principally consists of an Ethernet. Thus in this work, the access terminals are logically connected to the virtual ports of the Ethernet in a Proteus interface. The primary function of this access terminal unit is to supply the needed address of each of the CAN controllers, based on their load priorities. It can be of any number, depending on the users request. Block diagram of the control systemĪccess Terminal Unit: This comprises of access layer servers. ![]() The units are: the Access Terminal Unit, the Switching Unit, the Signal Indicator Panel Unit, the Controller Unit and Loads.įig. The Control System Block diagram The block diagram of the system comprises of five distinct units/parts as shown in figure 1. How this is achieved is that, each CAN controller is given an address which uniquely identifies that CAN, and makes it accessible at the Access layer terminal. One good thing about this method is that each load in the network is linked to a particular CAN controller, and this enhances excellent control performance. And these computers which form the nodes in that network are used to control several loads via different CAN controllers. One of such ways that even appears to be the most effective method is by the use of an Ethernet controller to form a LAN network which connects many computers together. It is not new to say that there are many ways of controlling loads that are remotely distributed in a large industry or factory, such as using GSM handset, Internet-based method, etc. Keywords: CAN controller, Proteus, Poly Vinyl Chloride, Local Area Network, Microcontroller. ![]() This was achieved by replacing the Ethernet controller with a programmed AT89C55 microcontroller to achieve the same switching logic, and this confirmed the workability of the system in a real-life situation. This study was implemented in the control of the industrial processes from the Access layer servers in a real-time environment. The system network was developed in a Proteus environment by interconnecting the Access layer servers, Ethernet Controller (which establishes a Local Area Network, LAN), and CAN Controllers. A typical industrial application used as a case study for this work is a chemical industry which produces Vinyl Chloride, a major raw material used in the production of Poly Vinyl Chloride (PVC) products. The system has four Access layer servers connected to several loads via four Controller Area Networks (CANs) using Proteus software (Version 7.6). This paper analyzes the real-time simulation of a networked-process control system for a chemical industry. Federal Polytechnic, Nekede, Imo State, Nigeria of Electrical/Electronics Engineering, Nnamdi Azikiwe University, Awka, Nigeria. Nnamdi Azikiwe University, Awka, Nigeria.ĭept. of Electrical Engineering, Nnamdi Azikiwe University, Awka, Nigeria. of Electronic and Computer Engineering, Dept. Real-Time Simulation Of A Networked-Process Control System For A Chemical Industryĭept.
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