INTRODUCTION

 

PROFIBUS (PROCESS FIELD BUS) which is anchored in the international standards IEC 61158 and IEC 61784 is an open, digital communication system with a wide range of applications, particularly in the fields of factory and process automation. It is suitable for both fast, time-critical applications and complex communication tasks.

 

Main advantages of PROFIBUS are as follows:

 

- Baudrate up to 12Mbit/s

 Maximum PROFIBUS-DP BUS cable length depending on the baud rate being used is as follows:

              

 

Using our convertor and gateway modules, you can easily include devices with serial ports into PROFIBUS networks and PROFIBUS DP master devices can access them over PROFIBUS.

 

Gateway models work as Modbus/RTU and Modbus/TCP masters, scan and access data on the slaves (two-way) and map those data into IN and OUT WORDS at PROFIBUS side.

 

Convertor models have low level registers that PROFIBUS master PLC can access and use for implementing special protocols on serial ports.

 

 

All the PROFIBUS convertors and gateways we provide have a very good level of compatibility to PROFIBUS standards. PROFIBUS DP-V0 and DP-V1 protocols are supported. It is very easy to configure  a system and test the communications with free available GSD files. In cases of complex projects, project based support from our company could also be requested.

 

 
In industrial harsh enverionments, communication over the data lines is disturbed by the noise and ripple signals being induced on these lines. Main cause of these noisy signals is the unwanted electromagnetic fileds in the environment and RS485, RS422 and CAN standards overcome this problem by using differential voltage lines for data signals. However, another cause for these noisy signals are the faulty currents flowing through the data cables due to the different grounding potentials at the two end-points of the data line. This unwanted system is called a "Ground Loop". sometimes this faulty current becomes so high that it is enough to damage the equipment at the two ends of the data line. Escessive surge currents flowing through the data  lines during lightning strikes are good examples for these situations. The only way to prevent such damages is to galvanically isolate the equipment attached to the data line. Since same scenairo is also possible for the power lines of these equipment, isolating the power lines also is the best solution.

 

DC / DC convertors are utilized at the power input and optocouplers are used for the signal lines in order to implement an isolation barrier inside a convertor or repeater. Max voltage difference between the input and output of an isolation barrier that the barrier could withstand without a damage, defines the level of that isolation barrier. Convertors and repeaters we are offering all have an isolation barrier of 3000 Vdc or 3750 Vrms AC. Although our standard models have 2-way isolation, there are also special models available with 3-way isolation.