Following the IEC 61131-3 standard, you can develop applications using:
The software installed on the PLC (or a device like a Raspberry Pi) that executes your application. Core Programming Languages Codesys Software User Manual
Best for complex, step-by-step processes. Instruction List (IL) & Continuous Function Chart (CFC) . Essential Setup Steps Chapter - AutomationDirect Following the IEC 61131-3 standard, you can develop
Visual logic similar to electrical relays. Following the IEC 61131-3 standard