31.1 Controlling External I/O
    31.1.1 Mapping Addresses (Variables) to I/O Terminals
       31.1.1.1 Direct Registration on the I/O Screen
       31.1.1.2 Mapping by Drag and Drop to I/O Terminals from the Address Window
       31.1.1.3 Mapping by Drag and Drop to I/O Terminals from the Logic Program
       31.1.1.4 I/O Address Format
31.2 Settings Guide
31.3 Controlling External I/O with the Display Unit's Internal DIO
31.4 Using FLEX NETWORK External I/O
31.5 Controlling External I/O with LT
31.6 Controlling I/O in LT3000 Series and EX Modules
31.7 Controlling External I/O with CANopen
31.8 Controlling External I/O in the LT3000 Series and AnyWire Master Unit