TM172PDG42R

Configured for integrated control, local parameter adjustment, and Ethernet/serial communication in Modicon M171/M172 platforms, the Schneider Electric TM172PDG42R (TM172PDG42R Programmable Controller) provides 42 integrated I/O channels with Modbus, BACnet, WebVisu, USB, CAN, and Ethernet interfaces. The controller operates from 24 VAC/DC and includes a front LCD, keypad, Micro-SD slot, and relay outputs.

Hardware Specifications

Parameter	Specification
Model	TM172PDG42R
Brand	Schneider Electric
Series	Modicon M171/M172
Product Type	Programmable Controller
Application	HVAC and pumping control
Total I/O	42
Digital Inputs	12, 24 VAC/DC
Digital Input Current	2.5 mA
Input Impedance	10 kOhm
Analog Inputs	12, pairwise configurable
Analog Input Signals	0-10 V, 0-20 mA, 4-20 mA, NTC, PTC, Pt1000, resistance and direct input
Analog Input Temperature Range	NTC -50 to 110 deg C; NTC -40 to 150 deg C; PTC -55 to 150 deg C; Pt1000 -200 to 850 deg C
Analog Input Resolution	0.1 deg C for specified temperature inputs
Analog Outputs	6
Analog Output Signals	0-10 V; 4-20 mA; PWM up to 2 kHz on specified channels
Digital Outputs	12 integrated outputs, relay configuration
Relay Output Current	1 A for SPDT; 3 A for SPST
Ethernet	1 x RJ45, Modbus TCP, BACnet IP, WebVisu, FTP
RS485	2 interfaces, Modbus serial link or BACnet MS/TP
CAN	1 x CAN port
USB	1 x USB Type A; 1 x USB Mini-B
Display	Backlit LCD, 128 x 64 pixels
Local Storage	1 x Micro-SD card slot
Controller Supply	24 VAC +/- 10%; 20-38 VDC
Power Consumption	15 W at 24 VAC/DC
Sensor Supply	5 VDC at 50 mA; 24 VDC at 150 mA
Mounting	35 mm DIN rail or mounting plate
Dimensions	144 mm W x 110 mm H x 60.5 mm D
Weight	0.385 kg
Operating Temp	-20 to 60 deg C; -20 to 65 deg C with derating
Storage Temp	-30 to 70 deg C
Relative Humidity	5-95%, non-condensing
Protection Rating	IP20
Pollution Degree	2
Operating Altitude	0-2,000 m
Certifications	CE, EAC, CSA, cURus
Standards	EN/IEC 60730, UL94 V0
Recommended Replacement	TM172PDG42RI
EAN	3606480894886

Ethernet, I/O Density and Control Interfaces

The TM172PDG42R integrates 42 I/O points in a single controller, comprising 12 digital inputs, 12 analog inputs, 12 digital outputs, and 6 analog outputs. The Ethernet interface provides Modbus TCP master/slave and BACnet IP communication together with WebVisu and FTP functions.

Two RS485 interfaces support Modbus serial link or BACnet MS/TP operation. The controller also provides a CAN interface and separate USB Type A and Mini-B interfaces. The USB interfaces support program transfer and PC programming functions.

The analog input architecture accepts voltage, current, resistance, and temperature sensor signals. Selected temperature channels support 0.1 deg C resolution. The digital inputs accept sink or source logic and operate from 24 VAC/DC.

Frequently Asked Questions

Q: What is the nominal power supply for the TM172PDG42R?
A: The controller accepts 24 VAC with a +/- 10% tolerance or 20-38 VDC. The specified power consumption is 15 W at 24 VAC/DC.

Q: How is the controller mounted?
A: The TM172PDG42R can be installed on a 35 mm DIN rail or on a mounting plate using the specified mounting accessories.

Q: Which communication interfaces are integrated?
A: The controller provides one Ethernet RJ45 interface, two RS485 interfaces, one CAN port, one USB Type A port, and one USB Mini-B port. Ethernet supports Modbus TCP and BACnet IP, while the RS485 interfaces support Modbus serial link or BACnet MS/TP.

Field Installation Guidelines

• Verify the supply type before energizing. Use 24 VAC within the specified tolerance or 20-38 VDC.
• Install the controller on a 35 mm DIN rail or mounting plate with adequate mechanical retention.
• Maintain physical separation between low-level analog wiring and high-current relay or power wiring to reduce electrical interference.
• Use twisted and appropriately shielded cable for communication and low-level analog circuits where required by the installation environment.
• Connect cable shields according to the plant grounding scheme and avoid creating unintended shield current paths.
• Check the polarity and signal reference of 24 VDC, 4-20 mA, 0-10 V, RS485, and other field circuits before commissioning.
• Do not exceed the specified relay output current. SPDT outputs are rated at 1 A and specified SPST relay configurations at 3 A.
• Provide adequate ventilation around the controller and account for the stated operating temperature and derating conditions.
• The IP20 enclosure requires installation inside an enclosure or panel providing the required environmental protection.
• For an existing TM172PDG42R installation, verify hardware and application compatibility before migration to the recommended TM172PDG42RI replacement.

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