Rockwell Automation 1787-GEN2SKIT, -2, -3, -4, -5, -6, -7 DeviceNet Starter Kit User Manual - Manual (Page 105)

Publication DNET-UM003A-EN-P - August 2000
Build the Scanlist 4-9
EDS file. We are going to automap these devices then edit the input
and output mapping positions.
5. Click on to add all devices to the scanlist at once.
When all devices are added to the scanlist you see:
Notice the Electronic Key area of the window.
When the Electronic Keys are checked, RSNetWorx will remember
what version of the device you are adding to the scanlist as well as I/
O mapping. This is helpful when you need to be certain that a
particular device release is used.
The Electronic Keys could be a limitation when you need to replace a
device and the device you receive from your vendor is a different