I/O modules

Domat I/O modules accelerate BMS and HVAC integration by providing distributed, right-sized I/O expansion with open Modbus RTU communication — eliminating costly cabinet rewiring, reducing commissioning time, and enabling flexible point allocation across offices, retail, and industrial sites throughout the EU. Instead of oversized centralized I/O or proprietary fieldbus systems, these modular units let integrators place intelligence exactly where needed: from compact field locations (MLIO 4AI/1AO/2DO) to high-density applications (RXIO 88-point) with consistent addressing and protocol handling.

How they streamline projects: Every module communicates over galvanically isolated RS485 with standardized Modbus RTU register maps, enabling rapid integration with Domat PLCs, third-party BMS platforms, and SCADA systems. The lineup spans combined I/O (RCIO 30-point), specialized digital outputs (R220 relay, R312/R313 triac, R320/R330 open collector), precision analog inputs (R500 voltage/current, R560 universal, R800 combined), and purpose-built wall modules for room-level control (MW240-B blinds/lights, MW241 LED SSR, MW501 single AI). This modularity means you can optimize each location — compact RMIO for heat exchange stations, high-density RXIO for plant rooms, or wall-mounted MW-series for distributed room functions — all sharing the same commissioning workflow and Domat IDE integration tools.

Technical features include 24V AC/DC operation, DIN-rail or wall mounting options, and robust industrial design with clear datasheets in English. Digital outputs range from relay (8A@250V) through triac (PWM-capable) to open collector for signal applications. Analog inputs support universal ranges (Pt100/1000, 0-10V, 4-20mA) with galvanic isolation, while specialized modules handle pulse counting (R710) and mixed AI/AO functions (R800).

Constraints: Proper grounding and shielding required for long RS485 runs; verify load categories for relay/triac outputs; configuration handled in master PLC/SCADA, not locally in modules.

Book a 20-min session to map your distributed I/O strategy and select optimal module combinations for your project topology.