{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"TM172PDG28SI","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"TM172PDG28SI","canonicalUrl":"https://aoctrl.com/schneider/TM172PDG28SI","factsUrl":"https://aoctrl.com/api/mcp/products/TM172PDG28SI","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Modicon M171/M172 Programmable Controller, TM172PDG28SI, 28 I/O, 8 AI, 4 AO, 8 DI, 8 DO, Ethernet, RS485, CAN, active lifecycle.","salesMarkdown":"## HVAC Controller with 28 I/O The TM172PDG28SI is a Modicon M171/M172 series programmable controller built for HVAC control, carrying 28 total I/O: 8 digital inputs (24 V AC/DC, sink or source), 8 analog inputs configurable by pair for NTC, Pt1000, 0–10 V, or 4–20 mA, 4 analog outputs (2 voltage, 2 voltage/current/PWM), and 8 digital outputs (3 A relay SPDT/SPST and 0.5 A isolated SSR). Onboard communications include one Ethernet port (Modbus TCP and BACnet IP with webserver), two RS485 ports (Modbus serial or BACnet MS/TP), one CAN port, and USB ports for programming and data transfer. Backlit LCD 128×64 display provides local HMI for status and parameter adjustments without an external panel. ## Mounting & Environmental Fit Dimensions: 5.7 x 4.3 x 2.4 in (144 x 110 x 60.5 mm). IP20 rating keeps it inside a clean enclosure; pollution degree 2 fits typical control panels. Operating ambient -4 to +149 °F (-20 to +65 °C) with a 5 to 95% non-condensing humidity range. When mounted horizontally and listed to UL 60730-1, the maximum ambient derates to 131 °F (55 °C). Rated supply voltage 24 V ±10% AC or 20–38 V DC; draws 12 W typical. Sensor power outputs: 5 V DC at 50 mA and 24 V DC at 150 mA, derived from the controller. ## Analog Input Flexibility & Accuracy Eight analog inputs configurable by pair. Accepts NTC 103AT-2 and NK103, Pt1000, PTC, 0–10 V, 0–5 V, 0–20 mA, 4–20 mA, and high-ohm resistance measurements. Input impedance 10 kΩ for voltage, <150 Ω for current. Measurement accuracy: ±1 °C for NTC and Pt1000 ranges (50–100 °C band), ±1% of full scale for 4–20 mA and 0–10 V, ±2% for 0–4 mA. Built-in real-time clock drifts ≤30 s/month over -20 to +65 °C. Discrete inputs draw 2.5 mA at 24 V AC/DC; logic selectable sink or source for wiring flexibility. ## Compliance & Sourcing Certified to CSA 60730-1, UL 60730-1, EN 60730-1, EN 60068-2-27 (shock), EN 60068-2-6 (vibration), and meets IEC 61000-4-x EMC immunity levels. Material flammability rated UL94 V-0. Compliant with EU EMC Directive 2014/30/EU and Low Voltage Directive 2014/35/EU. Overvoltage category II, pollution degree 2.","metaTitle":"Schneider TM172PDG28SI Modicon PLC, 28 I/O, HVAC","metaDescription":"Active Modicon M171/M172 programmable controller for HVAC with 28 I/O, 8 analog inputs, Ethernet & RS485. Sourced to order; quote via RFQ.","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":"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 solid state, isolated SSR with independent common","Power consumption in W":"12 W 24 V AC/DC","Discrete output current":"3 A relay SPDT 3 A relay SPST 0.5 A solid state, isolated","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...131 °F (-20...55 °C) horizontal UL 60730-1"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$353.06 – $444.00","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/909acefdde49b7d4bb1aaa648bf48c22.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/TM172PDG28SI/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of the TM172PDG28SI?","answer":"The depth is 2.4 in (60.5 mm)."},{"question":"What is the width of the TM172PDG28SI?","answer":"The width is 5.7 in (144 mm)."},{"question":"What compliance documentation does the TM172PDG28SI carry?","answer":"It is certified to CSA/UL/EN 60730-1 and 60730-2-9, meets IEC 61000-4-x EMC standards, and is compliant with EU EMC and Low Voltage directives. Material rating is UL94 V-0."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/TM172PDG28SI","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/TM172PDG28SI 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}}