5. Overview
Festo P.BE-CMMP-FHPP-DN-SW-EN en 0708NH 23
5. Overview
5.1 Overview of DeviceNet
DeviceNet is a machine-orientated network which enables connections between simple
industrial devices (sensors, actuators) and higher-order devices (controllers). DeviceNet is
based on the CIP protocol (Common Industrial Protocol) and shares all common aspects of
CIP with adaptions which enable the frame size of messages to be adapted to that of
DeviceNet. Fig. 5.1 shows an exanple of a typical DeviceNet network.
Fig. 5.1: DeviceNet network
DeviceNet offers:
An economic solution for networks at the device level
Access to information in devices at a lower level
Possibility for master/slave and peer-to-peer
DeviceNet pursues two main aims:
Transporting control-orientated information which is in connection with devices of the
lower level (I/O connection).
Transporting further information which is indirectly connected with the closed-loop
system such as configuration parameters (Explicit Messaging Connection).
5.2 I/O connection
Some types of I/O connections are defined by DeviceNet™. At present only Poll Command
/ Response Message with 16 bytes input data and 16 bytes output data are supported.
This means that the master periodically sends 16 bytes of data to the slave and the slave
also replies with 16 bytes.
The meaning of the data is determined by the FHPP user protocol. Please refer to the FHPP
manual for detailed information.
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