GFK-2950C February 2018 61
Chapter 4 Ladder Diagram (LD) Programming
This chapter describes the programming instructions that can be used to create ladder logic
programs for the PACSystems control system.
For an overview of the types of operands that can be used with instructions, refer to Operands for
Instructions in Chapter 3.
The ladder logic implementation of the PACSystems instruction set includes the following categories:
▪ Advanced Math Functions
▪ Bit Operation Functions
▪ Coils
▪ Contacts
▪ Control Functions
▪ Conversion Functions
▪ Counters
▪ Data Move Functions
▪ Data Table Functions
▪ Math Functions
▪ Program Flow Functions
▪ Relational Functions
▪ Timers
▪ Motion Functions and Function Blocks
RX3i CPUs support PLCopen compliant motion functions and function blocks. Details of these
function blocks can be found in the PACMotion Multi-Axis Motion Controller User’s Manual,
GFK-2448.
▪ PROFINET I/O Communication
Consists of the PNIO_DEV_COMM function. For details, refer to the PACSystems RX3i & RSTi-EP
PROFINET I/O Controller Manual, GFK-2571.
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