الفهرس 
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Abstract
here are many different networks, which have been promoted for use in manufacturing control systems. A current trend in manufacturing control is towards distributed implementations of control systems. When the control algorithms and hardware are physically distributed across the manufacturing system, individual machines can run autonomously, which can help in any problem diagnostics or reprogramming that is necessary. These distributed control systems use networks to communicate the data.
Thus, the use of networks in a manufacturing control system can reduce the amount of elec¬trical wiring, reduce the cost and complexity of a control system, it can also reduce the floor space needed for electrical cabinet to hold all the wiring. This network architecture also makes any changes to the manufacturing system much simpler to implement.
The common features of modem distributed systems are a large number of devices interconnected together to perform the desired operations, and a large area of coverage.
From the above, it is necessary to understand the operation, features and native application of different control networks, which are commonly used in the industrial systems.
This thesis concern the Industrial Control Networks, developed by different leading companies to communicate between different devices, sensors, actuators, drives, controllers, PLCs, PCs, ... etc. to control and monitor the operation of the industrial systems. And also use the data for historical trends and to support the maintenance team by the required data.
Each network has a native application and is designed to perform desired communication between different devices. Hence, the classification of control networks according to the application simplifies the structure of the control system in large plants.
The thesis discusses three protocols; MODBUS, HART and CAN protocols to show how the different Industrial Control Networks work to perform their desired purpose of communication. The thesis includes application programs to communicate between different devices by MODBUS protocol in ASCn mode. The first program can communicate as a master of the network, and the other one as a slave. A practical application of the experience gained from this study was applied to upgrade the control system to monitor and control substations in a refinery plant.
Moreover, the thesis includes short details regarding other common control networks used in industrial systems.