Rockwell Automation 1747-SDN SLC 500 DeviceNet Scanner Module User Manual - Manual (Page 138)

Publication 1747-UM655B-EN-P - June 2007
138 Data Organization
Explicit Message Program Control
Words 224…255 are used for Explicit Message Program Control. Use
this feature to configure device parameters on your DeviceNet
network via the M0 and M1 files in the SLC processor that is
controlling these devices.
Download Output Data to
the Module The SLC 500 processor writes output data to the module by using two
methods.
•
Output image table
•
M0 file transfer
Output Image Table
The output image table is a 32-word table for the module slot that is
updated from the processor with each program scan. The first word
(word 0) of this table is reserved for the module command register.
The remaining 31 words can be used to transfer data from the SLC
output table to the DeviceNet nodes.
Module Command Register
The module command register is located at word 0 in the output
image area for the slot. To execute a command, set the appropriate
bits in the module command word by using SLC ladder instructions.
The following table describes the functionality of the command
register bits.