Honeywell Control Blocks for Siemens
One Control Philosophy Across the Plant
0.1 — Draft · March 2026
Author: Branimir Georgiev, Imbra
Industrial plants running Honeywell DCS as the main control system routinely use Siemens PLCs for auxiliary units — compressors, utilities, ancillary processes. The result is a split control environment: operators trained on Honeywell semantics must context-switch every time they work on a Siemens unit. Block names differ. Parameter conventions differ. Alarm and interlock behaviour differs.
This library ports the core Honeywell control modules — PID, DEVCTL, AI, AO, DI, and DO — to Siemens S7-300/1500 as native FC/FB blocks written in SCL and called from Ladder in TIA Portal. The blocks replicate Honeywell semantics precisely: same parameter names, same state machine behaviour, same alarm logic. Operators work with one control philosophy across the entire plant.
1. The Mixed DCS/PLC Challenge
2. Honeywell Control Block Semantics
3. The Port Architecture
4. Block Reference
5. Operational Benefits
6. Deployment
7. Conclusion
Siemens S7-300/1500 · TIA Portal · SCL · FC/FB architecture · Honeywell Experion · Honeywell TDC 3000