ControlLogix DeviceNet Scanner Module 5
Publication 1756-IN566B-EN-P - April 2001
Understand the Module’s Software Features
The 1756-DNB module has the software features described in the
following sections. You activate these features by using RSNetWorx
for DeviceNet™ software (catalog no. 9357-DNETL3). For more
information, refer to the appropriate RSNetWorx for DeviceNet
documentation, and to the 1756-DNB Scanner User Manual,
publication 1756-UM515C-EN-P.
Slave Mode
The slave mode feature allows processor-to-processor
communication. It does this by allowing the scanner to perform as a
slave device to another master on the network.
Like other slaves, the scanner module exchanges data with only one
master when it is in slave mode. You control what information is
exchanged through the scan list configuration and associated
mapping functions of RSNetWorx for DeviceNet software.
The 1756-DNB can function in the following modes:
Change of State
The scanner module can send and receive data on a change of state
basis with slave devices that also have this feature. Data is sent:
• whenever a data change occurs, or
• at a user-configurable heartbeat rate
Scanner is in this mode when it
Null contains an empty or disabled scan list (out-of-box default).
Master serves as a master to one or more slaves but is not
simultaneously serving as a slave to another master.
Slave serves as a slave to another master.
Dual serves as both a master to one or more slaves and as a slave to
another master simultaneously.
Allen-Bradley
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