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T h e R o l e o f S e n s o r s a n d C o n t r o l Te c h n o l o g y i n C I M
Counter/Timer
A counter/timer can be used to perform event counting, flow meter monitoring, frequency counting, pulse width and time period measurement, and so on. Most data acquisition and control hardware is designed with the multiplicity of functions described earlier on a single card for maximum performance and flexibility. Multifunction data acquisition for highperformance hardware can be obtained through PC boards specially designed by various manufacturers for data acquisition systems.
Computer System
Today s rapidly growing PC market offers a great selection of PC hardware and software in a wide price range. Thus, a CIM strategy can be economically implemented.
Hardware Considerations
Different applications require different system performance levels. Currently, 286, 386, and 486 CPUs will allow a PC to run at benchmark speeds from 20 up to 150 MHz. Measurements and process control applications usually require 80286 systems. However, for applications that require high-speed real-time data analysis, an 80386 or 80486 system is much more suitable.
Industrial PCs
An industrial PC (IPC) is designed specifically to protect the system hardware in harsh operating environments. IPCs have rugged chassis that protect system hardware against excessive heat, dust, moisture, shock, and vibration. Some IPCs are even equipped with power supplies that can withstand temperatures from 20 to +85 C for added reliability in harsh environments.
Passive Backplane and CPU Card
More and more industrial data acquisition for sensors and control systems are using passive backplane and CPU card configurations. The advantages of these configurations are reduced mean time to repair (MTTR), ease of upgrading the system, and increased PC-bus expansion slot capacity. A passive backplane allows the user to plug in and unplug a CPU card without the effort of removing an entire motherboard in case of damage or repair.
Communication Interfaces
The most common types of communication interfaces used in PCbased data acquisition for sensor and control system applications are RS-232, RS-422/485, and the IEEE-488 general-purpose interface bus (GPIB).
Five
The RS-232 interface is the most widely used interface in data acquisition for sensors and control systems. However, it is not always suitable for distances longer than 50 m or for multidrop network interfaces. The RS-422 protocol has been designed for long distances (up to 1200 m) and high-speed (usually up to 56,000 bits/s) serial data communication. The RS-485 interface can support multidrop data communication networks.
Software
The driving force behind any data acquisition for sensors and control systems is its software control. Programming the data acquisition for sensors and control systems can be accomplished using one of three methods: Hardware-level programming is used to directly program the data acquisition hardware s data registers. In order to achieve this, the control code values must determine what will be written to the hardware s registers. This requires that the programmer use a language that can write or read data from the data acquisition hardware connected to the PC. Hardware-level programming is complex, and requires significant time time that might be prohibitive to spend. This is the reason most manufacturers of data acquisition hardware supply their customers with either driver-level or package-level programs. Driver-level programming uses function calls with popular programming languages such as C, PASCAL, and BASIC, thereby simplifying data register programming. Package-level programming is the most convenient technique of programming the entire data acquisition system. It integrates data analysis, presentation, and instrument control capabilities into a single software package. These programs offer a multitude of features, such as pull-down menus and icons, data logging and analysis, and real-time graphic displays.
Developing CIM Strategy with Emphasis on Sensors Role in Manufacturing
To develop a comprehensive CIM strategy incorporating sensors and control systems, an enterprise must begin with a solid foundation, such as a CIM architecture. A CIM architecture is an information system structure that enables the industrial enterprise to integrate information and business processes. It accomplishes this by (1) establishing the direction integration will take and (2) defining the interfaces between the users and the providers of this integration function. Figure 5.14 shows how CIM architecture answers the enterprise s integration means. A CIM architecture provides a core of common
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