Rockwell Automation 1788-DNBO DeviceNet Daughtercard Installation Instructions - Manual (Page 10)

10 DeviceNet Daughtercard
Publication 1788-IN053A-EN-P - December 2001
Logix Controller Interface
The 1788-DNBO daughtercard supports several different size input, output, and status
structures when communicating with Logix controllers, such as FlexLogix. These I/O
structures were created to reduce the complexity of connecting DeviceNet I/O and status
data with ladder programs. The daughtercard creates all 3 structures whether or not
DeviceNet nodes are configured or online. The RSLogix 5000 software directs the controller
to connect to these predefined default I/O structures. The controller automatically performs
periodic updates of the structures on a cyclic basis.
The RSNetWorx for DeviceNet software configures scanlist map segments that are used to
copy specific portions of I/O data between the I/O structures and DeviceNet network
packets.
Output Structure
The controller controls output I/O by writing output data to an output structure in the
1788-DNBO daughtercard. The daughtercard then delivers a copy of these output values to
modules on DeviceNet. The output structure consists of a 32-bit command register and a
variable size 32-bit array of up to 123 words for output data.
IMPORTANT
You must use RSLogix 5000 programming software version 10 or later in
order to configure the 1788-DNBO daughtercard in a FlexLogix system.
Output Structure Element Description Data Type
module command register This 32-bit register consists of several
bits that affect the daughtercard’s
behavior on the network. 1 x 32-bit register
output_data 123 x 32-bit data array