Chapter 4
Configuration
MAN_105G_1.5
Page
60
4.8
Data Bus Configuration - Profibus Slave
The Profibus 105U-G-PF1 acts as a Profibus DP Slave - the host device is a Profibus Master.
If you use the 105U-G with a PLC, the PLC will require a GSD file so it can recognise the
Profibus interface in the 105U-G. This file loads into the PLC. The file is available on the
same CD as the configuration software.
Configuration of the Profibus data bus comprises allocating a Profibus Slave address to the
105G, and configuring links between the I/O registers and the Profibus bytes in the Anybus
interface module.
The Profibus address can be set in the “Bus Config” screen or via the rotary switch on the
end-plate of the module- valid slave addresses are 1 – 126. If the “Enable Rotary Switch”
box is not selected, then the address entered in the program will be used and the rotary switch
value ignored. If the “Enable Rotary Switch” box is selected, then the address entered in the
configuration program will be ignored and the rotary switch read on start-up of the 105G.
The Anybus Profibus interface has 416 bytes, of which 244 can be used as input bytes, or 244
can be used as output bytes. These “Anybus bytes” are directly addressable by the data bus.
Read or write links are configured between the Anybus interface bytes and the I/O registers.
A Read Link reads values from Anybus “output” bytes and stores the values in I/O registers.
If the host device wants to send a value to the 105G, it will write to the Profibus output bytes
- the 105G will then transfer these values to the I/O data base using a Read Link.
A Write Link writes I/O register values to Anybus “input” bytes. If you want to send a value
from the 105G to the host device, the value is transferred from the I/O database to a Profibus
input byte using a Write Link - the host device can then read this input byte.
The Profibus bytes are 8-bit. Each byte can contain 8 digital values, or one 8-bit value, or two
consecutive bytes can be converted to a 16-bit value.
Note that the Profibus input bytes and output bytes both number from 0 - that is, there is an
input byte 125 as well as an output byte 125.
I/O
DATABASE
I/O REGISTERS
WRITE LINK
DATA BUS
BYTES
READ LINK
ANYBUS
INTERFACE
RADIO
DRIVER
DATA BUS
ANTENNA
