{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TM172OBM28R","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"TM172OBM28R","canonicalUrl":"https://aoctrl.com/schneider/TM172OBM28R","factsUrl":"https://aoctrl.com/api/mcp/products/TM172OBM28R","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Modicon M172 Programmable Controller, TM172OBM28R, 28 I/O, 24 V AC/DC, IP20.","salesMarkdown":"## Controller for HVAC The Schneider TM172OBM28R is a Modicon M172 programmable controller purpose-built for HVAC control, packing 28 mixed I/O (8 digital inputs, 8 analog inputs, 8 digital outputs, 4 analog outputs) in a DIN-rail mount with IP20 protection. Rated supply voltage covers 24 V AC or 20–38 V DC, so it runs off the same rail the rest of the cabinet uses. The real-time clock drifts ≤30 s/month across its -20 to 65°C operating range — enough to timestamp trend data without a separate time sync. ## I/O and Sensor Mix The 8 analog inputs are configurable by pair for voltage (0–5 V, 0–10 V), current (0–20 mA, 4–20 mA), or resistance/temperature probes (NTC, PTC, Pt1000). That gives a single part number flexibility across a range of field sensors — one controller for a rooftop unit or a chiller. Analog outputs: two channels fixed at 0–10 V, plus two more configurable for 4–20 mA, 0–10 V, or PWM (2 kHz). Relay outputs cover SPDT and SPST on independent or shared commons, rated 3 A each. Digital inputs sink or source, 2.5 mA per channel at 24 V AC/DC — standard for HVAC I/O modules, no special sourcing needed. Compliance package covers CSA, UL 60730, EN 60730, IEC 61000 series (EMC immunity), both EMC and LV directives. Pollution degree 2, overvoltage category II — clean enough for commercial buildings and light industrial HVAC. No direct pin-compatible alternative exists within the same family; the M172 line uses a fixed I/O mix per order code. If the BOM requires exactly 28 I/O, this controller is the target.","metaTitle":"TM172OBM28R Modicon M172 Controller, 28 I/O","metaDescription":"Active Modicon M172 programmable controller for HVAC. 28 I/O (8 DI, 8 AI, 8 DO, 4 AO), 24V AC/DC, IP20. Compliant with CSA, UL, IEC. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":[],"specifications":{"Depth":"2.4 in (60.5 mm)","Width":"5.7 in (144 mm)","Height":"4.3 in (110 mm)","Variant":"Programmable","Category":"US1PC1222537","Standards":"CAN/CSA-E60730-1 CSA E60730-2-9 EN 60068-2-27 EN 60068-2-6 Fc EN 60730-1 EN 60730-2-9 UL 60730-1 UL 60730-2-9 IEC 61000-4-2 IEC 61000-4-3 IEC 61000-4-4 IEC 61000-4-5 IEC 61000-4-6 IEC 61000-4-11 UL94 (material V0)","Directives":"2014/30/EU - electromagnetic compatibility 2014/35/EU - low voltage directive","Display type":"Without Display","Number of port":"1 CAN port - screw terminal block 1 USB type mini B - USB device port Mini-B 2 RS485 - screw terminal block Modbus serial link or BACnet MS/TP)","Realtime clock":"Built-in clock, clock drift <= 30 s/month at -4...149 °F (-20...65 °C)","Input impedance":"10 kOhm","lifecycle_stage":"current","Local signalling":"1 LED (red) for programmable 1 LED (yellow) for programmable 1 LED (green) for programmable 1 LED (green) for power","Mounting Support":"DIN rail Panel mounting with accessory","Pollution degree":"2","Range of Product":"Modicon M171/M172","Relative humidity":"5...95 % non-condensing","Operating altitude":"0...6561.68 ft (0...2000 m)","Analogue input type":"impedance 0...1500 hOhm 1 hOhm 10 kOhm impedance 0...300 daOhm 1 daOhm 2 kOhm NTC 103AT-2 Beta 3435 temperature probe - 50...110 °C 0.1 °C 10 kOhm voltage 0...10 V 1 digit > 10 kOhm NTC NK103 Beta 3977 temperature probe - 40...137 °C 0.1 °C 10 kOhm extended) current 0...20 mA/4...20 mA 1 digit < 150 Ohm PTC temperature probe - 55...150 °C 0.1 °C 2 kOhm voltage 0...5 V 1 digit > 20 kOhm absolute or ratiometric) Pt 1000 temperature probe - 200...850 °C 0.1 °C 2 kOhm direct input > 10 kOhm","Input/output number":"8 digital input 8 analog input 4 analog output 8 digital output","Sensor power supply":"5 V DC 50 mA supplied by the controller 24 V DC 150 mA supplied by the controller","Discrete input logic":"Sink or source (positive/negative)","Measurement accuracy":"NTC NK103 Beta 3977 - 40...+110 °C +/- 1 °C NTC NK103 Beta 3977 110...137 °C +/- 1.9 °C NTC 103AT-2 Beta 3435 - 50...110 °C +/- 1 °C PTC - 55...155 °C +/- 1.1 °C Pt 1000 - 200...-100 °C +/- 10 °C Pt 1000 - 100...-50 °C +/- 2.5 °C Pt 1000 - 50...100 °C +/- 1.5 °C Pt 1000 100...400 °C +/- 2.4 °C Pt 1000 400...850 °C +/- 10 °C 0...20 mA 0...4 mA +/- 2 % of full scale +/- 1 digit 0...20 mA 4...20 mA +/- 1 % of full scale +/- 1 digit 4...20 mA +/- 1 % of full scale +/- 1 digit 0...10 V +/- 1 % of full scale +/- 1 digit 0...5 V +/- 1 % of full scale +/- 1 digit HOhm 0...1500 hOhm +/- 8.5 hOhm DaOhm 0...300 daOhm +/- 2.5 daOhm","Overvoltage category":"II","Total inputs/outputs":"28","Analogue input number":"8 configurable by pair","Discrete input number":"8","Nbr. of units in pkg.":"1","Analogue output number":"2 voltage 0...10 V 2 voltage/current 4...20 mA or 0...10 V or PWM (2 kHz)","Discrete input current":"2.5 mA","Discrete input voltage":"24 V AC/DC","Discrete output number":"1 relay outputs SPDT with independent common 3 relay outputs SPST with same common 2 relay outputs SPST with same common 2 relay outputs SPST with independent common","Power consumption in W":"12 W 24 V AC/DC","Discrete output current":"3 A relay SPDT 3 A relay SPST","IP degree of protection":"IP20","Product or Component Type":"Programmable controllers","[Us] rated supply voltage":"24 V +/- 10 % AC 20...38 V DC","Product Specific Application":"HVAC control","Ambient Air Temperature for Storage":"-22...158 °F (-30...70 °C)","Ambient air temperature for operation":"-4...149 °F (-20...65 °C) UL 60730-1 -4...140 °F (-20...60 °C) horizontal UL 60730-1"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$315.81","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5c5da5434b152e58f160a726bff1c8f9.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/TM172OBM28R/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does this brand provide for TM172OBM28R?","answer":"The controller carries CSA, UL 60730, EN 60730, and IEC 61000 series approvals, and meets both EMC directive 2014/30/EU and Low Voltage Directive 2014/35/EU."},{"question":"What temperature range can the TM172OBM28R operate in?","answer":"Ambient operating temperature is -4 to 149 °F (-20 to 65 °C) per EN, with a derated range of -4 to 140 °F (-20 to 60 °C) when mounted horizontally per UL 60730-1."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/TM172OBM28R","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/schneider/TM172OBM28R when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:21:01.794Z","lastPublished":"2026-09-02T08:21:01.794Z","indexable":true}}