Specifications
Glossary
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NMT network management. NMT protocols provide services for network initialization,
error control, and device status control.
object dictionary Part of the CANopen device model that provides a map to the internal structure of
CANopen devices (according to CANopen profile DS-401). A device’s object
dictionary (also called the object directory) is a lookup table that describes the data
types, communications objects, and application objects the device uses. By
accessing a particular device’s object dictionary through the CANopen fieldbus, you
can predict its network behavior and build a distributed application.
ODVA Open Devicenet Vendors Association. The ODVA supports the family of network
technologies that are built on the Common Industrial Protocol (EtherNet/IP,
DeviceNet, and CompoNet).
open industrial
communication
network
A distributed communication network for industrial environments based on open
standards (EN 50235, EN50254, and EN50170, and others) that allows the
exchange of data between devices from different manufacturers.
output filtering The amount that it takes an output channel to send change-of-state information to
an actuator after the output module has received updated data from the NIM.
output polarity An output channel’s polarity determines when the output module turns its field
actuator on and when it turns the actuator off. If the polarity is normal, an output
channel will turn its actuator on when the master controller sends it a 1. If the polarity
is reverse, an output channel will turn its actuator on when the master controller
sends it a 0.
output
response time
The time it takes for an output module to take an output signal from the Island bus
and send it to its field actuator.
parameterize To supply the required value for an attribute of a device at run-time.
PDM power distribution module. A module that distributes either AC or DC field power to
a cluster of I/O modules directly to its right on the Island bus. A PDM delivers field
power to the input modules and the output modules. It is important that all the I/O
clustered directly to the right of a PDM be in the same voltage group—either
24 VDC, 115 VAC, or 230 VAC.
PDO process data object. In CAN-based networks, PDOs are transmitted as unconfirmed
broadcast messages or sent from a producer device to a consumer device. The
transmit PDO from the producer device has a specific identifier that corresponds to
the receive PDO of the consumer devices.
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