Rockwell Automation 1794-L34 FlexLogix Controller System User Manual - Manual (Page 30)

Publication 1794-UM001G-EN-P - January 2007
30 Communicate over Networks
Define Data Blocks
How you configure the DeviceNet devices determines how many
words you use per device. The 1788-DNBO card supports a maximum
of:
• 124 32-bit words of input data
• 123 32-bit words of output data
• 32 32-bit words of status data
Most DeviceNet devices support 16-bit words. Take care how you
map these into the 32-bit words used in RSLogix 5000 programming
software. RSNetWorx for DeviceNet lets you DINT-align the device
data. While this might simplify the organization of the data, it might
also limit the data you have available.
For more information... The DeviceNet Modules in Logix5000 Control Systems User Manual,
DNET-UM004 provides information on how to:
• configure DeviceNet communication module
• control devices on DeviceNet
The Logix5000 Controllers Design Guidelines Reference Manual,
1756-RM094 provides guidelines on optimizing a control application
on a DeviceNet network.