Usually you use the MAC ID of your main Ethernet card, or the Volume ID of your C: drive, or a special USB dongle from RA. Raouls suggestion is right: you need to generate a new.LIC file that uses a hardware ID on the new computer. The OP probably has a FactoryTalk activation, which is tied to a particular hardware identifier on the computer. The activation file was not tied to a particular value you enter during installation or to a particular computer.

Standard starts with 1203 Pro starts with 2022 Mini starts with 1635 Full starts with 2445 Edit: I forgot to list the paths for the XP registry keys: HKEYLOCALMACHINESOFTWARERockwell SoftwareRSLogix 5000.1Last VersionUserInfoSerialnum HKEYLOCALMACHINESOFTWARERockwell SoftwareRSLogix 5000.1SupportProductID HKEYLOCALMACHINESOFTWARERockwell SoftwareRSLogix 5000.1UserInfoSerialnum level 1 1 point 5 years ago IIRC, the serial is tied to the install disk but its been a while since Ive usedinstalled any Rockwell software level 2 1 point 5 years ago The installation diskette hackcoder refers to was the old EVRSI activation system. Logix only cares about the first 4 numbers of the serial number.

Rslogix 500 activation file