{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TM172PDG28RI","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"TM172PDG28RI","canonicalUrl":"https://aoctrl.com/schneider/TM172PDG28RI","factsUrl":"https://aoctrl.com/api/mcp/products/TM172PDG28RI","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Modicon M172 programmable controller, TM172PDG28RI, 28 I/O (8 DI, 8 AI, 8 DO, 4 AO), backlit LCD, 2 RS485 + Ethernet.","salesMarkdown":"## What this controller covers The Schneider Electric TM172PDG28RI is a Modicon M172 programmable controller built for HVAC duty, carrying 28 total I/O with 8 analog inputs configurable by pair. It packs a backlit LCD, dual RS485 ports, and Ethernet with built-in BACnet/IP and Modbus TCP — enough to run a rooftop unit or air handler as both controller and gateway without an extra module. ## I/O and sensor handling The analog inputs handle NTC 103AT-2 and NK103 thermistors, Pt1000 RTDs, PTC, 0–10 V, 0–5 V, and 4–20 mA — configured by pair via software. Accuracy on the Pt1000 spans from ±1.5 °C in the -50…100 °C band to ±10 °C at the extremes, so match the probe to the application. The 8 discrete inputs are sink/source configurable at 24 V AC/DC; outputs are relay (3 A SPDT or SPST) plus 2 analog voltage and 2 analog voltage/current/PWM. A built-in 24 V DC sensor supply (150 mA) powers loop-powered transmitters. ## Communications and display Two RS485 screw-terminal ports run Modbus serial or BACnet MS/TP; the Ethernet port runs Modbus TCP and BACnet IP with a web server. That means the controller can talk to a BAS head-end directly and serve a local display page. The 128 × 64 backlit LCD shows system status and programmable screens — useful for commissioning without a laptop. ## Power and mounting Supply is 24 V AC/DC (±10% AC, 20…38 V DC); draws 12 W. IP20 rated, mounts on a panel cutout or DIN rail using an accessory. Dimensions: 5.7 in wide, 4.3 in tall, 2.4 in deep — fits a standard 144 mm × 110 mm footprint. Operating temperature -4…149 °F (-20…65 °C), storage -22…158 °F (-30…70 °C).","metaTitle":"Schneider Electric TM172PDG28RI Programmable, 28 I/O","metaDescription":"Schneider Electric Modicon M172 programmable controller TM172PDG28RI for HVAC, 28 I/O (8 AI configurable by pair), 2 RS485, Ethernet, 128x64 LCD. Active production, sourced to orde","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":"Backlit LCD - 128 x 64 pixels","Number of port":"1 CAN port - screw terminal block 1 USB type A - USB type A female 1 USB type mini B - USB device port Mini-B 2 RS485 - screw terminal block Modbus serial link or BACnet MS/TP) 1 Ethernet - RJ45 Modbus TCP and BACnet IP with webserver)","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":"Panel mounting with accessory DIN rail","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":"$330.20 – $435.00","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1e3a739cbec991e83e53bc36330c4968.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/TM172PDG28RI/alternatives.json"},"ai":{"faq":[{"question":"What are the key dimensions of TM172PDG28RI?","answer":"Width 5.7 in (144 mm), height 4.3 in (110 mm), depth 2.4 in (60.5 mm)."},{"question":"What compliance certifications does TM172PDG28RI hold?","answer":"It is certified under UL 60730-1, CSA E60730-1 / E60730-2-9, EN 60730-1 / 60730-2-9, and meets IEC 61000-4-2/3/4/5/6/11 EMC standards, plus 2014/30/EU and 2014/35/EU directives. The enclosure material is UL94 V0."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/TM172PDG28RI","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/TM172PDG28RI 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}}