105U-G Wireless Gateway
User Manual
Page 77
© September 2004
entered in the configuration program will be ignored and the rotary switch read on start-up of
the 105G.
The Profibus interface has 416 bytes, of which 244 can be used as input bytes, or 244 can be
used as output bytes.
Note: For bit transfers, the bit offset is counted from the least significant bit (LSB) of the byte
(with bit 0 being the LSB) - if you transfer 3 bits with a bit offset of 5, then you will
transfer bits 5-7 of the byte. This is different than the Ethernet unit which counts the offset
from the most significant bit - refer next section.
An application note for configuring a Siemens S7 PLC to communicate with a Profibus 105G
can be downloaded from the Elpro web-site
www.elprotech.com
4.10
Fieldbus Configuration - Profibus Master
The 105U-G-PR2 implements a complete Profibus-DPV0/DPV1 master. The hardware is
optimized for high throughput and can be used in mono or multi master networks up to 12
Mbit/s. Up to 125 slaves with a total max of 2048 byte input and 2048 byte output data can be
connected.
4.10.1
GSD File
Each device in a Profibus network is associated with a GSD file, containing all necessary
information about the device. In general, the profibus slave device manufacturer supplies the
relevant GSD files. ESeries Configuration Software uses these files during network
configuration.