Overview
The TM171OB22R is a Schneider Modicon M171/M172/M173 programmable controller, order code TM171OB22R, with a variant label of Programmable and a product type of Controller. It provides 22 I/O points: 6 digital inputs (sink or source logic), 6 digital outputs (1 open collector, 3 relay SPST common, 2 relay SPST independent), 5 analog inputs (voltage 0–10 V, ratiometric 0–5 V, NTC, 0–20/4–20 mA), and 5 analog outputs (3 voltage 0–10 V, 2 PWM/PPM 20 kHz). The controller is blind (without display), DIN-rail mounted, rated IP20, and complies with EN/IEC 60730 and the low voltage directive 2006/95/EC.
The TM171OB22R is a programmable controller, whereas the TM171EO22R is an Additional I/O module — the same 22 I/O count (5 analog output, 6 digital input, 5 analog input, 6 digital output) but the TM171OB22R runs as a standalone logic engine, not an expansion slice.
