31.1 Controlling External I/O
31.2 Settings Guide
31.3 Controlling External I/O with the Display Unit's Internal DIO
    31.3.1 Procedure - Controlling External I/O with the Display Unit's Internal DIO
    31.3.2 I/O Driver Settings Guide - DIO Driver
    31.3.3 Error Information - DIO Driver
       31.3.3.1 Error Code - DIO Driver
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