Network Control And Monitoring - Hitachi SJ100DN DeviceNet Series Addendum Instruction Manual Addendum

Network Control and Monitoring

DeviceNet Overview
DeviceNet is a communications network typically used in factory automation applica-
tions. It is a specific implementation of a Controller Area Network (CAN), first devel-
oped for the automotive market. IC manufacturers produce CAN ICs by the millions, so
they are low-cost and reliable. DeviceNet adapts this technology for industrial control. It
allows a programmable logic controller (PLC) or other host computer to control up to 63
field devices such as relays, solenoids, and motor drives such as Hitachi's DN Series
inverters. DeviceNet has several advantages which have helped make it a popular choice
for various applications. The advantages include:
• Physical layout – main trunk line with individual drop lines
• Reduced wiring costs – uses a 5-wire cable; communications and device power are in
the same cable (power devices such as motor drives still require a main power source)
• Devices may be connected or disconnected without powering down the network (if
daisy-chained)
• Flexible device definitions – the device protocol provides for many types of input and
output structures
• Open standard – allows multiple vendors to produce many types of products that can
coexist on a network
Slave
DeviceNet is an open network standard, meaning that it has a non-proprietary protocol
and no licensing requirements. Hundreds of vendors are members of the Open
DeviceNet Vendor Association (ODVA), who ensures the integrity of the technical
standards and oversees device conformance testing. Hitachi DN Series inverters are
listed with the ODVA. This ensure compatibility with a wide range of devices from
vendors making thousands of DeviceNet compatible industrial products. This also helps
to connect those same devices over long distances in the factory.
Slave Master
(PLC or host
computer)
SJ100DN Inverter
Slave Slave
39
(up to 63
Slaves)