How to use Simple PLC function?

Introduction

What is simple PLC function?  This is also commonly referred to as built-in logic control / built-in sequence control function, meaning:

The VFD can perform some simple logic control and sequential operations without the need for an external PLC.

Different manufacturers use different names, and may also refer to it as "simple PLC," "built-in PLC," "sequence control," or "STEP control," etc.

Operation