Rockwell Automation DEVICENET 1771-SDN, User Manual

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Publication 1771-6.5.132 - June 2000
D-2 Data Map Example
Example Framework
Based on the backplane addressing mode and the scanner’s block
transfer support, the following number of discrete inputs are
supported.
This example adheres to the following structure:
•
only one master scanner can own a device; there may, however,
be multiple masters on a network
•
interface nodes (KFDs, PCDs, etc.) should be assigned node
numbers 62, 61, 60, etc.
•
node number 63 should always be left available to add a new
default device
•
address 0 is normally used for the scanner. Scanners in
multi-scanner networks are numbered 0, 1, 2, etc.
•
the first word in the device input data table contains the module
command word (this is applicable under any mapping scheme)
•
input data and status bits received from nodes 1-62 on channel
A are mapped to both the discrete inputs and the device input
data table
•
no discrete inputs are used for channel B
•
the device input data table is segmented
– one word for the module status word
– four words each for channel A and B devices’ input data bits
– four words each for channel A and B devices’ status data bits
Addressing Mode Discrete Inputs
2-slot 0
1-slot 8
1/2-slot 24