Technical data

PROFIBUS networks
1.1 Local area networks in manufacturing and process automation
PROFIBUS Network Manual
14 System Manual, Edition 04/2009, C79000-G8976-C124-03
PROFINET IO
PROFINET allows the integration of distributed field devices (IO devices, for example signal
modules) directly in Industrial Ethernet. The user data is transferred by means of TCP/IP or
IT standards. The simple engineering for PROFINET, field-proven with PROFIBUS, was
adopted here.
By retaining the device model of PROFIBUS, the same diagnostics information is available
on PROFINET.
From the viewpoint of programming with STEP 7, there is no difference between PROFIBUS
and PROFINET when accessing a distributed field device.
PROFINET based on the network technology of Industrial Ethernet, however, provides
enhancements that are extremely important for industrial applications and that are absent in
Ethernet.
PROFIBUS
Communications network for the cell and field area complying with IEC 61158-2 /
EN 61158-2 with the hybrid medium access technique token bus and master slave.
Networking is on twisted-pair or fiberoptic cable.
Transmission media: PROFIBUS networks can be implemented with the following:
● Shielded, twisted-pair cables (characteristic impedance 150 Ω)
● Fiberoptic cables
The various communication networks can be used independently or, if required, can also be
combined with each other.
PROFIBUS PA
PROFIBUS PA is the PROFIBUS for process automation (PA). It connects the PROFIBUS
DP communications protocol using the MBP transmission technique in compliance with
IEC 61158-2.
Transmission media: PROFIBUS PA networks can be created with intrinsic safety based on
shielded, twisted-pair cables (with PROFIBUS PA).
AS-Interface (AS-i)
The actuator sensor interface (ASi) is a communications network for automation at the
lowest level for connecting binary or analog actuators and sensors (also safety-oriented) to
programmable logic controllers via the ASi bus cable.
Transmission media: The flat yellow cable typical for AS-i transfers the network
communication and supplies the field devices with power.
IO Link
Communications standard below the fieldbus level. This allows central fault diagnostics and
location as far as the sensor/actuator level and simplifies commissioning and maintenance
by allowing parameter data to be modified dynamically, directly from within the automation
system.