Schneider Electric TM172E12R Modicon M172 12 I/O

TM172E12R: Modicon M172 expansion module, 12 I/O for HVAC control

The TM172E12R is a Schneider Electric Modicon M171/M172 additional I/O module for HVAC control. It is not a controller: it carries no programme of its own and only adds channels to an M171/M172 controller over the CAN port. Twelve I/O in the smallest housing (72 × 110 mm) make it the economical extension for a modest HVAC plant. The datasheet lists a single CAN port, which is the link to the controller, and no clock, no display and no Ethernet. This unit has 12 I/O: 2 discrete inputs, 6 digital relay outputs and 4 analogue inputs. Seven Star LLC supplies the TM172E12R in Oman and the GCC as an independent supplier based in Muscat.

The datasheet describes this as an optimised and performance expansion module. Because it is passive from the programming point of view, it should be selected together with the controller it will extend, and the controller datasheet should be checked for the maximum number of expansion modules it supports.

Typical uses of the TM172E12R in Oman and the GCC

In the Gulf, cooling load dominates building and plant energy use, which is why HVAC controllers of this class are common. This unit fits pump staging on booster and circulation sets, cooling-tower and heat-recovery sequences and fan-coil and ventilation zone control. As an expansion module it extends an existing controller when a plant grows. Facilities contractors, OEM panel builders and utility service teams specify this family for packaged plant and retrofit work.

Supply, size and environment

Supply is 24 V ±10 % AC or 20–38 V DC, with a consumption of 20 VA at 24 V AC; 10 W at 24 V DC. The housing is 72 mm wide, 110 mm high and 59 mm deep, weighing 0.14 kg; mounting is DIN rail or panel with accessory. Storage temperature is −30 to 70 °C and humidity 5–95 % non-condensing; protection is IP20, so the unit belongs inside a cabinet. The datasheet text we extracted does not state an operating temperature for this module, so confirm the value on the full datasheet.

In Oman and the wider Gulf, a controller panel on a plant roof or in a plant room routinely meets temperatures above the upper limits. Plan cabinet ventilation or cooling, and where the datasheet specifies derating, apply it to the actual cabinet air temperature rather than the room temperature.

Technical specifications of the TM172E12R

How the TM172E12R compares with related Modicon M171/M172 references

The nearest relatives of the TM172E12R from the datasheets we have read are listed below. Controllers and expansion modules share the housing family but differ in channels, display and Ethernet.

Inputs, outputs and communications of the TM172E12R

The discrete inputs are 2 (positive logic/sink, up to 2 kHz, 24 V AC/DC, 2.5 mA). The analogue inputs are 4 (configurable by pair), and each input can be set for NTC temperature probes (NK103 Beta 3977 from −40 to 137 °C, 103AT-2 Beta 3435 from −50 to 110 °C), 0–10 V, 0–5 V (absolute or ratiometric), 0–20 mA or 4–20 mA, resistance ranges, PTC probes and Pt 1000, or as a dry-contact input. Stated accuracy is ±1 % of full scale ±1 digit on 0–10 V, 0–5 V and 4–20 mA, and ±1 °C for the NK103 NTC between −40 and 110 °C.

The relay outputs are rated 3 A (SPST). The datasheet’s discrete-output entry describes the common groupings in detail for a smaller subset than the I/O summary (6 digital outputs), so confirm the terminal-to-common arrangement on the wiring diagram before you finalise a load schedule. The module can supply 5 V DC at 50 mA and 24 V DC at 125 mA to sensors. There are no analogue outputs on this smaller module.

Selection checklist for the TM172E12R

• Confirm the supply: 24 V ±10 % AC or 20–38 V DC.
• Count channels by type: 2 discrete inputs, 6 digital relays, 4 analogue inputs.
• Check that the relay ratings cover the load.
• Decide whether you need Ethernet and BACnet IP at all; this module has only CAN.
• Check the width of the housing (72 mm) against the panel layout.

Installation and maintenance of the TM172E12R

Mount the unit (DIN rail or panel with accessory) in a clean cabinet and keep low-voltage signal wiring away from relay-output cabling. Check that the supply is 24 V ±10 % AC or 20–38 V DC before energising, since the 48 V DC and 24 V ranges differ between family members. Commission outputs with loads disconnected, then enable each channel in turn, and record the final configuration so that a spare unit can be configured in the same way.

Probe lines should be screened where lengths are long, and the sensor-supply capability (listed in the specifications) must not be exceeded. During maintenance, check terminal tightness, cabinet temperature and dust, and keep the controller programme and parameters backed up. A new TM172E12R on the shelf is the fastest recovery if the panel runs a critical HVAC or pumping duty.

Information to send with an RFQ for the TM172E12R

• Exact reference TM172E12R and quantity.
• Control supply voltage available in the panel.
• The controller this module will extend.
• Load types on the relays.
• Delivery location and project deadline.

Documents and quotation

The manufacturer datasheet for the TM172E12R is attached on this page and includes the specification summarised above. Check the revision date against your project requirements.

Send us the reference TM172E12R, quantity and delivery location and Seven Star LLC will reply to your RFQ. We supply as an independent supplier based in Muscat.