Emerson SI-DeviceNet User Manual page 74

Event task: A special way to use a message or change of state to trigger a software
routine.
IN data: Data that is returned from a slave device to the DeviceNet master.
Long word: A 32-bit data word that may be signed or unsigned.
Mapping: The process of linking DeviceNet values to parameters within the drive.
Master: The controlling device on the network, generally this will include programming
features.
Network Loss Trip: A method to determine when a node has lost contact with the
master.
Node: A device on the network. This may be either a device such as a drive or part of
the network such as a repeater.
Non-Cyclic Data: Data that is requested or sent by the master as required. This is not
sent on a regular basis and generally allows access to any parameter. This is useful for
occasional changes or configuration purposes.
Object Dictionary: A collection of the objects that are supported by the product.
Poll rate: The rate at which cyclic data is sent and received on the network.
Response ID: The response code of the message received when using PPO4 word
non-cyclic communication.
Scan rate: See Poll rate in this section.
Shielding: A connection to provide additional immunity to noise used on a network
cable.
Segment: An electrically separate part of the network. Each segment requires correct
termination to ensure reliable operation. Due to electrical limitations the maximum
number of devices on a segment is limited to 32.
Slave: A device on the DeviceNet network such as a drive or sensor. A slave device will
only respond to messages from a master.
Status word: A value that denotes the status of the drive. Each bit within the word will
have a specific meaning.
Task ID: The code used to describe the purpose of a message using PPO 4 word non-
cyclic communication.
Termination: This is used at both ends of a network segment to prevent reflections and
reduce noise.
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SI-DeviceNet User Guide
Issue Number: 2