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1. Introduction
Functions of Master
There are two types of PROFIBUS DP master: DPM1 and DPM2. DPM1 (DP Master Class
1) gathers and controls all stations on one PROFIBUS DP network. DPM2 (DP master Class
2) operates network configurations, network maintenance, and diagnosis.
PROFIBUS DP master can control up to 126 stations (max. 2 kbytes) on one network.
A PLC is typically configured as a master and controls all devices in factory automation
system, but EPSON RC+ is also capable of being a master.
PROFIBUS DP network configuration is specified by configuration management software.
This software is normally provided by a master device manufacturer. The configuration
management software determines parameters for each slave device via an Electronic Data
Sheet (GSD).
The connection type is token passing procedure and master-slave communication. The token
passing procedure is applied to the PROFIBUS DP network with more than two master
devices to transfer network control between masters. The master-slave communication is
applied to the communication between the master device with network control and its slave
devices.
Available baud rates are 9.6 kbps, 19.2 kbps, 93.75 kbps, 187.5 kbps, 500 kbps, 1500 kbps, 3
Mbps, 6 Mbps, and 12 Mbps.
Functions of Slave
A slave can exchange data with a master device.
The configuration management software identifies parameters of each slave device via an
electronic data sheet (GSD) file where the parameters are registered.
The communication type is a cyclic master-slave communication.
The input/output data of each station is up to 244 bytes.
Available baud rates are 9.6 kbps, 19.2 kbps, 93.75 kbps, 187.5 kbps, 500 kbps, 1500 kbps, 3
Mbps, 6 Mbps, and 12 Mbps.
6 Fieldbus I/O Rev.6