Yes, this is dependant on a setting found on the corresponding Shop Floor client configuration card. The setting is called “Inactivity Log Out Time (Seconds)”. It is found in the “Time” section at the bottom.
Setting this value to 0 will turn this off, meaning no automatic log out.
Don’t forget to do a CTRL-F5 after any setting change in BC that affects the Shop Floor Insight web client.
You can also review this page here for some info: http://kb.dmsiworks.com/knowledge-base/configure-client-configuration-in-shop-floor-insight/