This indicates an attack attempt against a Directory Traversal vulnerability in ABB IDAL FTP Server.
The vulnerability is due to insufficient sanitization of user-supplied inputs. A remote, authenticated attacker may navigate to arbitrary directories on the hard disk. Successful exploitation may allow a remote attacker to download and upload files.
ABB PB610 Panel Builder 600 versions 1.91 to 184.108.40.2067
Information Disclosure: Remote attackers can gain sensitive information from vulnerable systems.
Apply the most recent upgrade or patch from the vendor.