Flowserve Limitorque MX DeviceNet Field Unit - Manual (Page 8)

Limitorque MX DeviceNet Field Unit FCD LMENIM2328-00 – 11/05
8
CAUTION: a Directs the user’s attention to general precautions that, if not followed, could result in
personal injury and/or equipment damage.
NOTE: Highlights information critical to the user’s understanding of the actuator’s installation and
operation.
1.4 User Knowledge
It is recommended that the user read this manual in its entirety before the DeviceNet equipped actuator
is installed and operated.
The user needs to have a fundamental knowledge of electronics and microprocessor concepts. An
understanding of valve actuators and digital control systems is also of benefit to the DNFU user.
1.5 DeviceNet System Capabilities and Features
DeviceNet is a low cost communications protocol which permits up to 64 nodes (devices) to be
installed over a single network and is based upon CAN (Controller Area Network), a broadcast protocol
developed for the automotive industry. DeviceNet™ protocol is defined as an open network standard and
Limitorque’s device is certified for use by the ODVA, Open Device Standard Association. DeviceNet is
usually PLC input controlled and the Limitorque MX electronic actuator is well suited for this communi-
cation system. A typical network is seen in Figure 1.1.
Figure 1.1 – Typical Network
1.5.1 General Specifications
1.5.1.1 Network Specifications
DeviceNet is a digital, trunk/drop network that connects and serves as a communication network
between industrial controllers and I/O devices.
DeviceNet follows the Open Systems Interconnection (OSI) model, an ISO standard for network
communications that is hierarchical in nature. Networks that follow this model define all necessary func-
tions from the physical implementation up to the protocol and methodology to communicate control
and information data within and across networks.