Installation Instructions User guide

1747-SDN DeviceNet Scanner Module 5
Publication 1747-IN058F-EN-P - December 2010
This feature has the following variations.
Poll
A poll message is a point-to-point transfer of data (0…255 bytes) sent by the scanner module
that solicits a response from a single device. The device responds with its input data
(0…255 bytes).
Strobe
A strobe message is a multicast transfer of data (64 bits in length) sent by the scanner module
that solicits a response from each strobed slave device. There is one bit for each of the
possible 64 node addresses. The devices respond with their data, which can be as much as
8bytes.
Change of State
Change of state enables the scanner module to perform a scan:
• whenever a network data change occurs.
• at a user-configurable heartbeat rate.
Because data is only sent on an as-needed basis, this feature increases system performance by
reducing network traffic.
Cyclic I/O
Cyclic I/O allows you to instruct the scanner module to perform a scan at a specific send rate.
Because data is only sent at a periodic rate, this feature increases system performance by
reducing network traffic.
Module Mode Description
Null Contains an empty or disabled scan list (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