Rockwell Automation 150 USE MN/SMC DIALOG + CONTROLLER - Manual (Page 136)

Serial Communications 8-27
Notice that the SMC Dialog Plus controller (node 13) has an “active”
status. This means that it is active in the scan list and will
communicate with the 1747-SDN scanner on the network.
You will also notice that “Yes” is listed twice under the Mapped
column. The left Yes indicates that input data is mapped from the
SMC Dialog Plus controller to the SLC-500. The right Yes indicates
that output data from the SLC-500 is mapped to the SMC Dialog Plus
controller. Configure the 1747-SDN if “No” is displayed.
To view the actual areas inside the SLC-500 processor where the
device data will be transferred to and from, select the Datatable Map
by clicking on the button; the following screen will appear: