Allen-Bradley DeviceNet 1756-DNB User Manual

P–3
Publication 1756–6.5.15 – July 1998
This term Means
Change of State The communication module can send and receive data with slave
devices that have the change of state feature. Data is sent
whenever a data change occurs or at a user-configurable heartbeat
rate.
Communication
Module
This refers to the 1756–DNB communication module.
Cyclic The communication module can send and receive data with slave
devices that have the cyclic feature. Data is only sent at a
user-configurable rate.
Dual Mode The communication module is in dual mode when it serves as a
master to one or more slaves and as a slave to another master
simultaneously.
EDS An electronic data sheet is a vendor-supplied template that dictates
how information is displayed as well as what is an appropriate
entry (value).
Explicit Messaging This messaging protocol states the meaning of the message.
The Explicit Message protocol commands the performance of a
particular task and returns the results of the task performance to
the requestor.
Heartbeat Rate The heartbeat rate is associated with producing data once every
EPR (Expected Packet Rate) duration. You may have four EPRs
before you time out. This only applies to change of state and cyclic
messaging.
Host Platform The computer that hosts the 1756–DNB communication module.
I/O I/O is an abbreviation for “input and output.”
Input Data This data is produced by a DeviceNet device and collected by the
communication module and made available for a host platform to
read.
Output Data This data is produced by a host platform that is written to the
communication module’s memory. This data is sent by the
communication module to DeviceNet devices.
MAC ID A MAC ID is the network address of a DeviceNet node.
Network This is a DeviceNet network or DeviceNet Manager software
representation of a network.
Node A node is the hardware that has a single address on the network
(also referred to as device).
Offline This is when the communication adapter is not able to
communicate on the network.
Online This is when the communication adapter is configured and enabled
to communicate on the network.
PC This is an abbreviation for an IBM

compatible personal-computer.
Poll This is a type of input/output-data communication. A poll message
solicits a response from a single, specified device on the network
(a point-to-point transfer of data).
Record This is a node address and channel-specific memory assigned in
the communication module’s non-volatile storage for a node in the
scan list.
Rx This is an abbreviation for “receive”.
Slave Mode The communication is in slave mode when it serves as a slave to
another master.
Strobe This is a type of input/output-data communication. A strobe
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 This is an abbreviation for “transmit”.
Te
rminolog
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Allen-Bradley Drives

Allen-Bradley DeviceNet 1756-DNB Specifications

General

Brand	Allen-Bradley
Model	DeviceNet 1756-DNB
Category	Control Unit
Language	English