Overview
The TM171ODM14R is a Schneider Modicon M171 programmable controller with 5 analog inputs, 9 analog outputs (5 analog, 4 relay), and 2 discrete inputs, order code TM171ODM14R. It operates on a 12 V DC / 5 V DC supply, mounts on DIN rail, and is rated IP20 for in-cabinet use.
The TM171ODM14R handles mixed analog and relay control in a compact package. Its 5 analog inputs accept voltage (0–10 V, 0–5 V ratiometric), current (0–20 mA / 4–20 mA), and temperature probes (NTC, Pt1000), making it suitable for reading sensors, transmitters, and thermocouple equivalents without external signal conditioners. The 9 outputs split into 5 analog outputs (0–10 V DC) and 4 relay outputs rated at 2 A switching current, using volt-free contacts for isolation. The single RS-485 port on a screw terminal block handles Modbus serial link communication, while the built-in real-time clock supports time-stamped data logging and scheduled events. Power draw is 85 mA at 12 V DC and 20 mA at 5 V DC. The controller is non-expandable, so all I/O is fixed at the factory configuration — 5 analog inputs, 5 analog outputs, 4 digital outputs, and 2 discrete inputs.
Applications
Modicon M171 controllers of this class are used in small machine automation, HVAC control, pump and valve sequencing, and building management systems where a mix of analog sensing and relay actuation is needed. The fixed I/O count suits dedicated single-purpose machines or skids where expansion is not required.