Thanks for the quick reply. I took another look, and you are completely correct... And I also discovered I was confused on where my problem really is ocurring, but I think I see the work-around. What I discovered is that the limitation of Logical Switches in the pull down list actually occurs in the AND Switch column when defining Logical Switches (not in the Special Functions, as I incorrectly stated in my previous post). For example, if I want to define Logical Switch L11 as active when Switch F is forward AND L13 is active, I'm out of luck, because the Logical Switches that can be selected in the AND Switch pull-down is limited to L01 - L12. On further review, however, it looks like I can make it work by reversing the And logic by selecting V1 as L13, and selecting the AND Switch as Switch F Forward from the pull-down (because the V1 pul down does not have the limitation). If I wanted to make Logical Switch L11 active when L13 AND L14 are true, there would probably be a problem though. I really shouldn't be trying to think these things through this late at night...