Omron NX-SL series

1 Introduction to Instructions for Safety Control Units and Interpreting Instruction Descriptions
1 - 2
NX-series Safety Control Unit Instructions Reference Manual (Z931)
1-1 Types of Instructions
The following three types of instructions can be used with the Safety Control Units.
Instruction specifications are provided starting from section 2.
Precautions for Correct Use
Some of the instructions have the same names as the instructions that are supported by the
NJ-series CPU Units. Operating specifications, however, are different.
Type Description
Standard functions These function instructions do not use safety data. They include program
execution control instructions, data type conversion instructions, Boolean
operation instructions, math instructions, comparison instructions, etc.
Safety standard function blocks These function block instructions use safety data. They include counter
instructions, up/down trigger instructions, timer instructions, etc.
Safety function blocks These function block instructions use safety data and are based on the safety
standards defined by PLCopen. They include an antivalent instruction, emer-
gency stop instruction, etc.