Lon - Local Operating Network; Devicenet; Modbus Rtu - Danfoss VLT 8000 AQUA series Operating Instructions Manual

LON - Local Operating Network

LonWorks is an intelligent fieldbus system which
improves the possibility of decentralising control,
as communication is enabled between individual
units in the same system (Peer-to-Peer).
This means that there is no need for a big main station
for handling all the signals of the system (Master-Slave).
Signals are sent direct 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 utilised, 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 also in building, infrastructure, transportation and
energy, applications are making use of its benefits.
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VLT 8000 AQUA
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