31.1 Controlling External I/O
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
    31.4.1 Procedure - Using FLEXNETWORK External I/O
    31.4.2 I/O Terminal Operations
    31.4.3 I/O Driver Settings Guide - FLEX NETWORK
       31.4.3.1 Unit Settings
       31.4.3.2 Setting Details for DIO Units
       31.4.3.3 Setting Details for Analog Units
       31.4.3.4 Setting Details for High-Speed Counters
    31.4.4 Error Information - FLEX NETWORK
    31.4.5 Restrictions
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