VLT
®
8000 AQUA
units, such as sensors and actuators, to the controls
by means of a two-conductor cable.
Profibus
FMS
is used if major communication
tasks are to be solved at cell- and system-level
by means of large volumes of data.
Profibus
DP
is an extremely fast communication
protocol, made specially for communication between
the automation system and various units.
VLT 8000 AQUA only supports DP.
■
LON - Local Operating Network
LonWorks is an intelligent serial communication system
which improves the possibility of decentralizing control,
as communication is enabled between individual
units in the same system (Peer-to-Peer).
This means that there is no need for a large main
station for handling all the signals of the system
(Master-Slave). Signals are sent directly to the unit
that needs them via a common network medium.
This makes communication much more flexible and
the central building state control and monitoring
system can be changed into a dedicated building
state monitoring system whose task is to ensure that
everything is running as planned. If the potential
of LonWorks is fully utilized, sensors will also be
connected to the bus, which means that a sensor signal
can quickly be moved to another controller. If room
dividers are mobile, this is a particularly useful feature.
■
DeviceNet
DeviceNet is a digital, multi-drop network, based
on the CAN protocol, that connects and serves
as a communication network between industrial
controllers and I/O devices.
Each device and/or controller is a node on the
network. DeviceNet is a producer-consumer
network that supports multiple communication
hierarchies and message prioritization.
DeviceNet systems can be configured to operate in a
master-slave or a distributed control architecture using
peer-to-peer communication. This system offers a
single point of connection for configuration and control
by supporting both I/O and explicit messaging.
DeviceNet also has the feature of having power
on the network. This allows devices with limited
power requirements to be powered directly from
the network via the 5-conductor cable.
■
Modbus RTU
MODBUS RTU (Remote Terminal Unit) Protocol is
a messaging structure developed by Modicon in
1979, used to establish master-slave/client-server
communication between intelligent devices.
MODBUS is used to monitor and program
devices; to communicate intelligent devices
with sensors and instruments; to monitor field
devices using PCs and HMIs.
MODBUS is often applied in gas and oil
applications, but applications in building,
infrastructure, transportation, and energy are
also making use of its benefits.
MG.80.A7.22 - VLT is a registered Danfoss trademark
14
Rosewood STP ST42 General (Operation and Maintenance Manual - Part 4:
Section 6.3 Manufacturers Manuals 6.3.33 Danfoss VLT Aquadrive 8000) Vendor Manual
QP Id: VM207
Active: 03/09/2013
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