Advanced Applications

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·Parameters can be set up and changed via the interface.

·Performance can be continuously monitored and controlled.

8.4Using PROFIBUS

8.4.1What is PROFIBUS?

PROFIBUS is an open standard communication protocol which has been designed and developed for use in general industrial applications. The standard is defined in EN50170 (volume 2) and has been developed, agreed and adopted by many manufacturers worldwide.

PROFIBUS control is now available for a wide variety of products, from many different companies such as drives, actuators, valves, as well as programmable logic controllers (PLCs) and other system controllers. PROFIBUS operates over a variety of hardware interconnections such as fiber optics and RS485.

There are three versions of PROFIBUS: FMS, DP and PA; these versions will work together. The most commonly used version is the DP version, intended for general industrial applications. This is the version supported by Siemens Drives.

8.4.2Using PROFIBUS with Siemens Standard Drives

In order to connect to a PROFIBUS system a PROFIUS adapter module is required. This module mounts on the front of the drive in the same way as the AOP, and uses the RS485 serial port to communicate to the drive.

A nine way ‘D type’ connector, which is a PROFIBUS standard, is incorporated into the module.

The drive may be controlled and monitored via the main PROFIBUS system in a similar way to the USS. The PROFIBUS protocol is more complex than the USS protocol (in fact, the USS is a simplified version) and control programmes are best developed using proprietary software.

Although a PROFIBUS system is more complex than for instance, the USS Protocol, it offers the following advantages:

·Open, clearly defined system.

·Many different products from many different manufacturers.

·Well proven in many industrial applications.

·Reduced wiring; easy set up re-programming, monitor and control.

·Very fast; up to 12 Mbaud.

·Up to 125 slaves on one DP system.

·Single or Multi-master operation possible.

·One to one or braodcast communications.

·Support and development software available.

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MICROMASTER Applications Handbook