SmartPLC SafeLine with PROFIBUS slave interface
173
10.6
Fieldbus Profibus
41507
PROFIBUS (
Pro
cess
Fi
eld
Bus
) is a standard for
→fieldbus communication in automation technology.
There are two versions of PROFIBUS, DP being the one most widely used.
PROFIBUS-DP (decentralised periphery) for the control of sensors and actuators by a central
controller in manufacturing engineering and for networking of several controllers among each
other. Data rates up to 12 Mbits/s on twisted two-wire cables and/or fibre optics are possible.
PROFIBUS-PA (process automation) is used for the control of measurement devices by a process
control system in process technology and is suited for hazardous areas (zones 0 and 1). Only a
limited current flows on the bus cables in an intrinsically safe circuit so that even in case of a
problem no explosive sparks can occur. A disadvantage of PROFIBUS-PA is the relatively slow
data transfer rate of 31.25 Kbits/s.
>
10.6.1
Fieldbus parameters
41509
The fieldbus parameters provide information for the integration of the device into the PROFIBUS
network.
Parameter
Meaning
Value range
PROFIBUS address
Address of the device in the
PROFIBUS network
3*
...
126
PROFIBUS baud rate
Data rate of the <Profibus> network
Auto detect*
9.6 Kbits/s
...
12 Mbit/s
* ... Preset values
If the Profibus address is set to 126, a corresponding DP V2 master can readdress the
address via the acyclic service "Set Slave Address".
