# PLCs

Part ID: 6.08a · Layer 6 (Facility cooling & HVAC) · child of 6.08

Programmable logic controllers that execute the low-level control loops — chiller sequencing, valve and damper modulation — the building management system directs.

## Companies

| Company | Role | Confidence | Ownership | Ticker | Note |
|---|---|---|---|---|---|
| Rockwell | manufacturer | inferred | public | ROK |  |
| Schneider Electric | manufacturer | inferred | public | SU.PA |  |
| Siemens | manufacturer | inferred | public | SIE.DE |  |
| Beckhoff | manufacturer | inferred | private |  |  |
| Phoenix Contact | manufacturer | inferred | private |  |  |

Confidence tags: disclosed = company/filing statement; reported = trade press or partner list; inferred = taxonomy lead.