PROFIBUS is an open digital communication system. It can be used in wide range of applications; particularly in factory automation and process automation. PROFIBUS is perfect for time-critical applications that require fast response and involve complex communication work. In the application of steel factory cold rolling system, the GW-7552 can be connected to multiple inverters to transmit data between PLC and inverter with low cost, and is able to fast access to a variety of on-site status, and by using error diagnosis mechanism of the PROFIBUS, it can response to unexpected events in real time.



PROFIBUS was developed in 1987 by Siemens and a few enterprises and research institutions; it has now been incorporated into the international standard IEC 61158 and IEC 61784. PROFIBUS is an open digital communication system. It can be used in wide range of applications; particularly in factory automation and process automation. PROFIBUS is perfect for time-critical applications that require fast response and involve complex communication work.

PROFIBUS-DP is a popular protocol, providing a simple, fast, cyclic and deterministic way to perform data exchange between the main station and the sub-station.


 

PROFIBUS Technology System Architecture

Gateway Solutions
To meet requirements to convert between PROFIBUS and other field bus protocols, ICP DAS developed various gateways. The users can freely choose the gateway to integrate into PROFIBUS network according to the communication protocol they are using when planning the system architecture.


 

Application

The cold rolling system in the steel factory mainly includes three parts: unwinding, cold rolling and rewinding. The operation of each part is done by controlling the inverter via PLC, and then the inverter control the rotation of the motor to complete the operation. The inverter uses Modbus RTU communication protocol and the main controller PLC uses PROFIBUS communication protocol. Each inverter requires installation of the PROFIBUS communication module to communicate via PROFIBUS communication protocol. The cost to implement the system will be high.

To solve the problem, GW-7552 is used in this application. A GW-7552 can connect toe multiple inverters to transmit the data between the PLC and the inverters. The cost will be much lower.

In this application, GW-7552 works as a Modbus RTU master terminal that retrieves the status information of each inverter. And in the PROFIBUS network, GW-7552 works as a PROFIBUS slave terminal. Therefore, by using GW-7552, the PLC can communicate with the inverters easily; and the users can quickly access a variety of on-site status and response in real time via the diagnosis mechanism of the PROFIBUS to deal with unusual events.


 

Device information:

GW-7552: PROFIBUS-DP slave to Modbus RTU/ASCII Gateway

• Supports PROFIBUS DP-V0 slave terminal function
• Features PROFIBUS transmission rates auto-detection function
• Transmission rate of PROFIBUS can be up to 12 Mbps, transmission rate of COM port can be up to 115.2 kbps
• The maximum input/output data length is 132/131 bytes.
• Support Modbus master and slave operation mode
• Support Modbus RTU and ASCII data format
• Built-in self-tuner ASIC controller on RS-485 port
• Network Isolation Protection, 2500 Vrms High Speed Coupler for PROFIBUS
• 3000 VDC isolation protection for PROFIBUS port
• With 4 kV ESD protection

For more information, please refer to:
https://www.icpdas.com/en/product/GW-7552-B
 

Converter Selection Guide