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Information and communication
Growth in the world of automation is increasingly
based on information technology. Having reformed
hierarchies, structures and flows in the entire office
world, use of information technology opens for a
similar restructuring of industrial sectors ranging
from process and manufacturing industries to
logistics and building automation.
Devices capability of communication and continuous
transparent channels for information are indispensable
in automation concepts of the future.
IT is an evident means for optimisation of system
processes, leading to improved exploitation of
energy, materials and investment.
Industrial communication systems are a key
function in this respect.
Cell level
Programmable controllers such as PLC and IPC
communicate at cell level. Large data packets
and numerous powerful communication functions
provide information flow. Smooth integration into
company-wide communication systems, such
as Intranet and Internet via TCP/IP and Ethernet
are important requirements.
Field level
Distributed peripherals such as I/O modules, measuring
transducers, drive units, valves and operator terminals
communicate with the automation systems via an
efficient, real-time communication system at field level.
Transmission of process data is performed in cycles,
while alarms, parameters and diagnostic data have
to be transmitted acyclically if necessary.
Sensor/actuator level
Binary signals from sensors and actuators are
transmitted purely cyclically via bus communication.
Profibus
Profibus is a vendor-independent, open field bus
standard for use in a wide range of applications
in manufacturing and process automation.
Vendor-independence and openness are ensured
by the international standards EN 50170, EN
50254 and IEC 61158.
Profibus communicates between devices from different
manufacturers without specific interface adjustments
MG.90.F2.22 - VLT is a registered Danfoss trademark
Decentral Solutions
and can be used for both high-speed time critical
applications and complex communication tasks.
Due to ongoing technical developments, Profibus
is widely acknowledged as the leading industrial
communication system of the future.
More than 2,000 products from approximately 250
Profibus vendors are available today. More than
6.5 million devices representing a huge variety of
products are installed and successfully used in
more than 500,000 applications in manufacturing
and process automation.
Danfoss Drives solution offers a cost
optimal Profibus solution
•
MCT-10 software tool for access via standard PC
•
Simple two-wire connection
•
A universal, globally-accepted product
•
Compliance with the international standard
EN 50170
•
Communication speed 12 Mbaud
•
Access to drive master file makes planning easy
•
Fulfilment of PROFIDRIVE guideline
•
Integrated solution
•
All variable frequency drives with Profibus are
certified by the Profibus organization
•
Danfoss variable frequency drives support
Profibus DP V1
Profibus DP V1 for two different purposes
Fieldbus systems are used for two very different
purposes with two very different sets of essentials in
modern automation applications. One is transfer of
signals referring to the process itself, the other service,
commissioning and set-up communication.
Transfer of control and status signals between sensors
and actuators is time critical and must be processed
reliably and in real time. This is accomplished by
cyclic communication where each node in the network
is polled within each cycle, and each cycle has a
pre-defined time. It is necessary to pre-define and
minimize the extent of data in each telegram to make
this work reliably and as fast as possible.
This consideration contradicts the second use of the
fieldbus, namely as a timesaving set-up and diagnostics
bus. Set-up and diagnostics are not time-critical, not
continuously used, and require a larger amount of data
in each telegram. Furthermore, you would tend to
control this information from a PC or an interface device
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