Proficy Machine Edition Programming Guide «2026 Update»

If you work with GE / Emerson PLCs (such as the RX3i, VersaMax, or Series 90-30), you have likely encountered Proficy Machine Edition (PME) . It is a powerful, integrated development environment, but its unique "single-workspace" philosophy can be challenging for beginners.

| Language | Best Used For | PME-Specific Tip | | :--- | :--- | :--- | | | Discrete logic, safety circuits, simple interlocks | Use coils and contacts exactly as you would on a hardwired diagram. Watch for the "power flow" concept. | | Structured Text (ST) | Complex math, loops, string handling, array manipulation | PME's ST is case-sensitive. Use := for assignment, not = . The guide has an essential appendix on ST syntax. | | C Block (C) | High-speed calculations, legacy code migration | Warning: C blocks are powerful but not supported on all newer CPUs. Check your target's compatibility first. | Proficy Machine Edition Programming Guide

Happy programming.