Catching the Process Fieldbus: An Introduction to Profibus - download pdf or read online

By James Powell, Henry Vandelinde

ISBN-10: 1606503960

ISBN-13: 9781606503966

A box bus is a two-way hyperlink among a programmable controller or operations video display and an commercial gadget like a sensor, an electrical motor, or a change. it's a serious a part of any computerized commercial approach - no matter if for manufacturing unit automation (discrete techniques like an meeting line) or method automation (continuous stream of fabrics being combined, handled, or processed). PROFIBUS is a greatly validated software that permits for conversation between and among controllers, fieldbuses, and actuator units. This very concise creation for commercial engineers, controls engineers, and production technicians covers the fundamentals of box bus structure and communique and the basics of the PROFIBUS language protocol.

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Additional info for Catching the Process Fieldbus: An Introduction to Profibus for Process Automation

Example text

PROFIBUS requires that communication occurs within a certain time in order to meet the determinism requirement of the control system. If there are too many repeaters in any one communication path, then this time limit (watchdog timer) is exceeded which is a serious error since your controller would no longer be able to control the processes. Often repeater manufacturers will require that some of the PROFIBUS timing parameters (also called PROFIBUS bus parameters) be adjusted so that the PROFIBUS watchdog timer will not be exceeded.

PROFIBUS has a number of different fiber optic solutions available, depending on cost and distance. Generally, the greater the distance, the higher the costs. Light pulse A modem is a device that translates a signal from one transmission technology to another. Electrical pulse in Fiber optic cable Electrical pulse out Fiber optics operation begins with an electrical signal which is converted into light, transmitted along the fiber optic cable and then converted back from light to an electrical pulse at its destination.

If the power goes from a high to a low during a pre-defined bit time, then it is a logical 1. If the power goes from a low to a high, then it is a logical 0. At the beginning of the message is a startup sequence so that all the devices on the network can coordinate bit times. Electrically this is far more complex than RS-485 and the above description is a simplification of how the physical layer works. MBP used for PROFIBUS PA is the same physical layer used by Foundation Fieldbus H1. Number of devices: This physical layer can handle a maximum of 32 devices (31 field devices plus one coupler).

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Catching the Process Fieldbus: An Introduction to Profibus for Process Automation by James Powell, Henry Vandelinde

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