Unconditional Branch Instructions 60 Program Interrupt Instructions 62 Logical (Boolean) Expressions 68 Conditional Branching Instructions 69 Looping Structures 72 Summary of Program Control Keywords 76 Functions 79 Using Functions 81 String-Related Functions 82 Location, Motion, and External Encoder Functions 84 Numeric Value Functions 85 Logical Functions 87 System Control Functions 88 Switches and Parameters 91 Introduction 93 Parameters 94 Switches 96 Motion Control Operations 99 Introduction 101 Location Variables 102 Creating and Altering Location Variables 109 Motion Control Instructions 116 Tool Transformations 124 Summary of Motion Keywords 126 Input/Output Operations 135 Digital I/O 137 Serial and Disk I/O Basics 139 Disk I/O 143 Advanced Disk Operations 148 Serial Line I/O 152 DeviceNet 156 Summary of I/O Operations 157 eV+Language User's Guide, v2.x, 18318-000 Rev A Page 6