Rockwell Automation DEVICENET 1771-SDN, User Manual

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Publication 1771-6.5.132 - June 2000
P-6 About This User Manual
Terminology
This term Means
Bridge The scanner module’s support of explicit message transfer.
Change of State A type of I/O data communication. The scanner module can send and
receive data with slave devices that have the change of state feature. Data
is sent whenever a data change occurs. Data is updated at the rate of the
heartbeat.
Communication
Module The 1771-SDN scanner module or the 1770-KFD module.
Cyclic A type of I/O data communication. The scanner module can send and
receive data with slave devices that have the cyclic feature. Data is only
sent at a user-configurable rate.
EDS Electronic Data Sheet. A vendor-supplied template that specifies how
information is displayed as well as what is an appropriate entry (value).
Explicit
Messaging A type of messaging used for lower priority tasks, such as configuration
and data monitoring.
Heartbeat Rate Devices that are configured for change of state data can also send a
“heartbeat” signal to indicate proper operation.
Host Platform The computer that hosts the 1771-SDN scanner module.
I/O An abbreviation for “input and output”.
Implicit
Messaging The type of messaging used for high priority I/O control data; e.g., change
of state, cyclic, polled, or strobed.
Input Data Data produced by a DeviceNet device and collected by the scanner module
for a host platform to read.
MAC ID The network address of a DeviceNet node.
Network The DeviceNet network or the RSNetWorx for DeviceNet software
representation of the network.
Node Hardware that is assigned a single address on the network (also referred
to as device).
Offline When the PC communication scanner is not communicating on the
network.
Online When the PC communication scanner is configured and enabled to
communicate on the network.
Output Data Data produced by a host platform that is written to the scanner module’s
memory. This data is sent by the scanner module to DeviceNet devices.
PC Abbreviation for an IBM ®
compatible personal-computer.
Polled A type of input/output-data communication. A polled message solicits a
response from a single, specified device on the network (a point-to-point
transfer of data).
Record The node address and channel-specific memory assigned in the scanner
module’s non-volatile storage for a node in the scanlist.
Rx An abbreviation for “receive”.
Scanlist The list of devices (nodes) with which the scanner is configured to
exchange I/O data.
Scanner The function of the 1771-SDN scanner module to support the exchange of
I/O with slave modules.
Slave Mode The scanner module is in slave mode when it is placed in another scanner
module’s scanlist as a slave device.
Strobed A type of I/O data communication. A strobed message solicits a response
from each strobed device (a multicast transfer). It is a 64-bit message that
contains one bit for each device on the network.
Tx An abbreviation for “transmit”.