Schneider TM172PDG42R Modicon M172 Controller

The SCHNEIDER ELECTRIC TM172PDG42R Modicon M172 Performance Display controller is a compact, programmable HVAC and pumping controller with 42 integrated I/Os, embedded Ethernet and Modbus communications, and a front LCD display for local operation and diagnostics. It is designed for energy‑efficient, connected machines where OEMs need flexible analogue and digital I/O plus multi‑protocol networking in a single controller.​

The TM172PDG42R belongs to the Modicon M171/M172 family and is classified as a programmable controller optimized for HVAC and pumping solutions. It combines discrete and analogue I/O, communication ports, and a built‑in backlit LCD into a single DIN‑rail or panel‑mount unit, reducing external modules and wiring.

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Key characteristics:

• 42 total inputs/outputs, mixing discrete and analogue signals for complex control strategies.​

• Integrated Ethernet (Modbus TCP/BACnet IP with web server), RS‑485 (Modbus/BACnet MS/TP) and CAN for field device and network integration.​

• 24 V AC/DC power supply with low consumption (approx. 15 W) and built‑in real‑time clock for time‑based control.

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Key features

• High‑density I/O for HVAC and pumping

  • 12 discrete inputs at 24 V AC/DC (sink/source) including fast inputs up to 2 kHz for pulses and counters.​

  • 12 digital relay outputs (SPST/SPDT combinations) for direct control of valves, contactors, fans, and pumps.​

• Rich analogue capability

  • 12 configurable analogue inputs by pair, supporting NTC, PTC, Pt1000, 0–10 V, 0–5 V, 0–20/4–20 mA for temperature, pressure, and flow transmitters.​

  • 6 analogue outputs: 4 voltage outputs 0–10 V and 2 multi‑mode outputs (0–10 V, 4–20 mA or PWM up to 2 kHz) for inverter, valve, or speed reference control.​

• Integrated display and diagnostics

  • Backlit LCD, 128 × 64 pixels, for setpoint entry, status viewing, alarms, and local commissioning without a laptop.​

  • Programmable LEDs (red, yellow, green) plus power LED for immediate status indication on the front panel.​

• Multi‑protocol connectivity

  • 1 Ethernet RJ45 supporting Modbus TCP and BACnet IP with embedded web server for remote access and BMS integration.​

  • 2 RS‑485 ports for Modbus serial or BACnet MS/TP, plus CAN bus for expansion or networked devices.​

• Embedded sensor power supplies

  • 5 V DC at 50 mA and 24 V DC at 150 mA available directly from the controller to power field sensors, reducing external power supplies.​

• Industrial design and environment

  • IP20 protection, pollution degree 2, operating temperature typically from about −20 °C to 60–65 °C with derating depending on mounting.​

  • Compact housing (approx. 144 × 110 × 60.5 mm, ~0.385 kg) for tight control panels.

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Uses in industry

• HVAC systems in buildings and marine applications

  • Control of air handling units, rooftop units, chillers, condensers, and fan coils with multiple temperature, humidity, and pressure inputs.​

  • Integration into building management systems over Modbus or BACnet, enabling centralized monitoring and energy optimisation in commercial, industrial, or shipboard HVAC.​

• Pumping and fluid management

  • Variable‑speed pump control using analogue outputs to VFDs for water supply, booster sets, wastewater, and cooling water circuits.​

  • Level, flow, and pressure regulation using 4–20 mA transmitters on the analogue inputs with relay outputs for pump staging and alarm signalling.​

• OEM machine control and skid packages

  • Packaged HVAC skids, heat exchangers, refrigeration racks, and compressor groups needing mixed I/O and connectivity in a single controller.​

  • Integration of safety alarms, door contacts, flow switches, and maintenance counters via discrete and fast inputs.

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Technical specifications (TM172PDG42R)