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Schneider Electric TM172PDG28RI

Schneider Electric TM172PDG28RI Programmable, 28 I/O

MPNTM172PDG28RI
Obsolete

Schneider Electric Modicon M172 programmable controller, TM172PDG28RI, 28 I/O (8 DI, 8 AI, 8 DO, 4 AO), backlit LCD, 2 RS485 + Ethernet.

$330.20 – $435.00Ref. price · indicative, final on quote
Schneider Electric TM172PDG28RI datasheet (PDF)
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MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

TM172PDG28RI key specifications
ParameterValue
Display typeBacklit LCD - 128 x 64 pixels
Range of productModicon M171/M172
Analogue input typeimpedance 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
Product or component typeProgrammable controllers
Discrete input voltage24 V AC/DC
Supply voltage24 V +/- 10 % AC 20...38 V DC
Discrete input current2.5 mA
Discrete output current3 A relay SPDT 3 A relay SPST
Sensor power supply5 V DC 50 mA supplied by the controller 24 V DC 150 mA supplied by the controller
Power consumption in12 W 24 V AC/DC
IP degree of protectionIP20
Mounting supportPanel mounting with accessory DIN rail

All specifications

TM172PDG28RI additional specifications
ParameterValue
Pollution degree2
Relative humidity5...95 % non-condensing
Operating altitude0...6561.68 ft (0...2000 m)
Depth2.4 in (60.5 mm)
Width5.7 in (144 mm)
Height4.3 in (110 mm)
StandardsCAN/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)
VariantProgrammable
CategoryUS1PC1222537
Directives2014/30/EU - electromagnetic compatibility 2014/35/EU - low voltage directive
Number of port1 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 clockBuilt-in clock, clock drift <= 30 s/month at -4...149 °F (-20...65 °C)
Input impedance10 kOhm
Local signalling1 LED (red) for programmable 1 LED (yellow) for programmable 1 LED (green) for programmable 1 LED (green) for power
Input (output number)8 digital input 8 analog input 4 analog output 8 digital output
Discrete input logicSink or source (positive/negative)
Measurement accuracyNTC 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 categoryII
Total inputs (outputs)28
Analogue input number8 configurable by pair
Discrete input number8
Analogue output number2 voltage 0...10 V 2 voltage/current 4...20 mA or 0...10 V or PWM (2 kHz)
Discrete output number1 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
Product specific applicationHVAC 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

Product details

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).

Frequently asked questions

What are the key dimensions of TM172PDG28RI?

Width 5.7 in (144 mm), height 4.3 in (110 mm), depth 2.4 in (60.5 mm).

What compliance certifications does TM172PDG28RI hold?

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.

MPN
TM172PDG28RI