Embedded supervisory control engine for Johnson Controls Metasys building management platform. It samples temperature, pressure and binary feedback signals from field sensors and actuators, executes PID loop control, sequence logic and equipment interlock. It supports Modbus RTU/TCP, M-Bus, KNX and BACnet MS/TP multi-protocol communication, and enables remote configuration, trend logging and alarm forwarding to SCADA. SA bus interface expands additional I/O modules, and hot-swap design supports online replacement without system shutdown.

Certification: UL, CE, FCC

Main CPU board, analog sampling circuit, relay I/O group, Ethernet transceiver, status LED and terminal block. Common faults: bus communication timeout, PID zero drift, onboard battery failure, flash file corruption.