PROFIBUS (Process Field Bus) is a standard for fieldbus communication in automation technology and was first promoted (1989) by BMBF (German department of education and research). It is the world's most successful fieldbus, with more than 31 million devices installed by the end of 2009. Over 5.4 million of these were in the process industries.

There are two variations of PROFIBUS in use today. The most commonly used PROFIBUS DP, and the lesser used PROFIBUS PA.

PROFIBUS DP (Decentralized Peripherals)

PROFIBUS PA (Process Automation)

ICP DAS has been developing various PROFIBUS DP Slave products for several years. We offer converters, gateways, and remote I/O to our customers, and help them to solve technology problems.

PROFIBUS DP Introdution

PROFIBUS DP is the main emphasis for factory automation, it uses RS-485 transmission technology. DP is the simple, fast, cyclic and deterministic process data exchange between a bus master and the assigned slave devices. The original version, designated DP-V0, has been expanded to include version DP-V1, offering acyclic data exchange between master and slave. A further version DP-V2 is also available, which provides for direct slave to slave communication with an isochronous bus cycle.

Class 1 Master

• A central programmable controller (PLC)
• Exchanges I/O data with connected slaves
• Determines the baud rate (slaves auto-detect this rate)
• Manages the token transfer between masters. Detects another master during the gap time

Class 2 Master

• Diagnostic, configuration, or startup tool (laptop、PC、programming console)
• Can only control one slave at a time
• Does not have write-access to the slave
• Does not have a GSD file

Slave

• A passive station which can only respond per a master request and acknowledge messages. A slave has no bus control rights
• The GSD file defines the slave for the master

OSI Model

GSD

GSD is a readable ASCII text file and contains both general and device-specific specifications for communication. Each of the entries describes a feature that is supported by a device. A configuration tool reads the device identification, the adjustable parameters, the corresponding data type and the permitted limit value for the configuration of the device from GSD.

Features:

• Baudrate up to 12 Mbit/s 
• Maximum 244 bytes input and 244 bytes output per slave
• Fast Cyclic data communication between master and slave
• Slave confi guration and parameters are set from the master side by GSD file
• Allow Multi-master system
• 124 slaves can be put in Data Exchange
• 32 stations on one segment

The PROFIBUS repeater is used to solve the issues of the PROFIBUS segment, transmission distance and disturbance when setting up a PROFIBUS network. If it is necessary to integrate the different communication interface, the PROFIBUS converter is helpful. The application architectures as following figures provide the examples to show when and how to apply these products.

The PROFI-8x55 Remote I/O Unit is designed for the slave device of PROFIBUS DP protocol. It supports up to 1/2/4/8 slots for ICPDAS I-8k, I-87k series I/O modules. In addition, we also provide hot-swap function for I-87k High Profi les series I/O modules. To setup network, users can choose and configure I/O modules by using the GSD file without any other setting.

Features:

• Detect transmission Rate Automatically (Max.12 Mbps)
• Support Device-Related & Channel-Related Diagnosis
• Address 0 ~ 126 Set by Rotary Switches or SSA-Telegram
• Support Hot-Swap for I-87K High-Profile I/O Modules
• 3000 VDC Isolation Protection on PROFIBUS side
• 1/2/4/8 I/O Slots for I-87K and I-8K Series I/O Modules
• 4 KV ESD Protection (contacting for any terminal)
• Operating Temperature: -25 ~ +75°C

Modules Support