What are the differences between Omron ST-Language and Siemens S7 SCL (definition of variables, the editor, syntax)? I know they both claim to be standardized by IEC 61131-3.
What Omron programming suites are there and is a structured language supported?
SCL (Structured Control Language) seems to be Siemens' version of Structured Text. So potentially there are a few differences but the overall concept and features will be the same.
In terms of programming for OMRON PLCs, there's Sysmac, which supports Structured Text and Ladder Diagrams.