可编程工作流程自动控制机床与设备开发与项目(5)

机床电气化系统设计与友好界面的编程开发

and programmable logical controllers (PLC) are utilized. A LabVIEW-based software framework has been developed for the LCL. Network communication and web server technologies have been used for the GCL. This paper will give a detailed introduction to the design and implementation of the DCS. Its performance and reliability will also be discussed.

Tasks and structure of the WENDELSTEIN 7-X control system

The super conducting stellarator WENDELSTEIN 7-X will run pulses of up to 30 min duration with full heating power. Short pulses with arbitrary intervals, steady state long discharges and arbitrary

sequences of short phases with different characteristics in one discharge will be supported by the control system. Each technical component and each diagnostic system including its data acquisition will have its own control system permitting autonomous operation for commissioning and testing. During the

experimental sessions the activity of these devices will be coordinated by a central control system and the machine runs more or less automatically with predefined programs. A session leader program allows the leader of the experiment to choose and chain predefined segments, to start or stop a segment chain as a discharge. The progress of the discharge is shown by a sequence monitor attached to the central sequence controller and the session leader program.

W7-X has to be prepared for the experiment and monitored by means of the PLC based operational

management system. A safety system working independently of the operational management consists of local units responsible for the safety of each component and a central unit ensuring the safety of the

whole W7-X system. This safety system provides interlocks and controls the human access to the device.

A safety analysis is the basis for the development of the safety system.

Implementing total productive maintenance in Nigerian manufacturing industries Remarkable improvements have occurred recently in the maintenance management of physical assets and productive systems, so that less wastages of energy and resources occur. The requirement for