A smart card reader can be used to check operator privileges on a single station or client. The smart card reader then works together with SIMATIC Logon, the user administration and access control function integrated in SIMATIC PCS 7 (see section "IT Security", under "SIMATIC Logon").

The smart card has the function of a "key" for the operator station. Inputs are only permissible as long as it is inserted in the reader. Such unambiguous identification is particularly necessary for plants having to comply with validation requirements.