I-7242D user manual
I-7242D DeviceNet/Modbus RTU Gateway User’s Manual, July 2006, Version 1.1 5/124
1 Introduction
1.1 Overview
The CAN (Controller Area Network) is a serial communication protocol,
which efficiently supports distributed real-time control with a very high level of
security. It is an especially suited for networking "intelligent" devices as well as
sensors and actuators within a system or sub-system. In CAN networks, there
is no addressing of subscribers or stations in the conventional sense, but
instead, prioritized messages are transmitted. DeviceNet is one kind of the
network protocols based on the CAN bus and mainly used for machine control
network, such as textile machinery, printing machines, injection molding
machinery, or packaging machines, etc. DeviceNet is a low level network that
provides connections between simple industrial devices (sensors, actuators)
and higher-level devices (controllers), as shown in Figure 1.1.
Figure 1.1 Architecture of the DeviceNet network
DeviceNet is a cost effective solution to one kind application of control
area network. It reduces the connection wires between devices and
provides rapid troubleshooting rejection function. The transfer rate can be
up to 500Kbps within 100 meters. The transfer distance can be up to 500
meters in 125Kbps (See Table 1.1). It allows direct peer to peer data
exchange between nodes in an organized and, if necessary, deterministic
manner. Master/Slave connection model can be supported in the same
network. Therefore, DeviceNet is able to facilitate all application
