"ATV61 CANopen_files_V1.8IE21(090106)" is a reference to a specific software update or file package for the ATV61 series of Compact Drives from ABB, a leading manufacturer in the electrical drive industry. The "CANopen" in the title indicates that this particular version (1.8IE21) is designed to work with the CANopen communication protocol, which is an industrial network standard used for fieldbus communication between devices in a manufacturing or automation environment. The number 090106 most likely represents the release date or build identifier, suggesting the files were made available on January 9th, 2009. This package would contain firmware images, device configuration files, and possibly communication profiles for connecting and controlling the ATV61 drives over a CANopen network. Users who have an ATV61 series motor controller would need this software to update their drive's functionality, integrate it into a larger control system, or access new features introduced in the V1.8IE21 update."