AH500 Module Manual 5. Select the icon of the rack where the I/O module is placed or the I/O module symbol. Click of the input and output items in the lower box for setting the starting address of D device mapped of each module as follows 11-26 One module which can not be identified is scanned by AHTRUT-DNET. Right click the current icon and select “Change” to change the icon into one identifiable icon for configuration.