Controller for Modicon M171/M172/M173 systems with 28 I/Os and Modbus compatibility.
Product ModelTM172PDG28S
Product ID34253
Stock on Request
Last updated: 8/29/2026
Key Features
1
FeatureEnhance control with 28 I/Os
2
FeatureModbus compatibility for seamless integration
3
FeatureReliable performance in industrial applications
4
FeatureCompact design for space-efficient installations
5
FeatureSolid-state relay outputs for precise control
Technical Specifications
Detailed engineering parameters based on manufacturer documentation
Specifications may be subject to change without notice
Parameter
Value
Parameter
Value
Range of Product
Modicon M171/M172
Product or Component Type
Programmable controllers
Product Specific Application
HVAC and pumping solution
Variant
Programmable
Total inputs/outputs
28
Discrete input number
8
Discrete output number
1 relay outputs SPDT with independent common3 relay outputs SPST with same common2 relay outputs SPST with same common2 solid state, isolated SSR with independent common
Discrete output current
0.5 A solid state, isolated1 A relay SPDT3 A relay SPST
Analogue input number
8 configurable by pair
Analogue output number
2 voltage 0...10 V2 voltage/current 4...20 mA or 0...10 V or PWM (2 kHz)
Number of port
1 CAN port - screw terminal block1 USB type A - USB type A female1 USB type mini B - USB device port Mini-B2 RS485 - screw terminal block Modbus serial link or BACnet MS/TP)1 Ethernet - RJ45 Modbus TCP and BACnet IP with webserver)
Input/output number
8 digital input8 analog input4 analog output8 digital output
Discrete input logic
Sink or source (positive/negative)
Discrete input voltage
24 V AC/DC
Discrete input current
2.5 mA
input impedance
10 kOhm
Analogue input type
impedance 0...1500 hOhm impedance 0...300 daOhmNTC temperature probe - 50...110 °C 0.1 °C extended) voltage 0...10 VNTC temperature probe - 40...150 °C 0.1 °C current 0...20 mA/4...20 mAPTC temperature probe - 55...150 °C 0.1 °C voltage 0...5 V absolute or ratiometric)Pt 1000 temperature probe - 200...850 °C 0.1 °C
Sensor power supply
5 V DC 50 mA supplied by the controller24 V DC 150 mA supplied by the controller
[Us] rated supply voltage
24 V +/- 10 % AC20...38 V DC
Power consumption in W
15 W 24 V AC/DC
Realtime clock
Built-in clock at -4...131 °F (-20...55 °C)
Display type
Backlit LCD - 128 x 64 pixels
Overvoltage category
II
Local signalling
for programmable 1 LED (red) for programmable 1 LED (yellow) for programmable 1 LED (green) for power 1 LED (green)
Mounting Support
DIN railPanel mounting with accessory
Width
5.7 in (144 mm)
Height
4.3 in (110 mm)
Depth
2.4 in (60.5 mm)
Net Weight
0.7 lb(US) (0.3 kg)
Directives
2006/95/EC - low voltage directive86/188/EEC - physical agents (noise) directive
