Is Your Legacy Modbus Plus Network Holding You Back?
Many plant engineers still rely on Modbus Plus for critical data transfer. But finding a reliable adapter module for the Modicon Momentum platform can be a real challenge. The Schneider 172PNN21022 solves that problem. This Modbus Plus option adaptor keeps your existing network running without a full system overhaul.
What Is the 172PNN21022?
The 172PNN21022 is a Modbus Plus option adaptor from Schneider Electric. It belongs to the Modicon Momentum automation platform. This module provides one communication port with a single Modbus Plus connection. It uses a 9-pin D-shell connector for straightforward wiring. The module draws power directly from the I/O base, so you do not need a separate power supply. A single LED shows communication status at a glance.
Technical Specifications That Matter
The 172PNN21022 operates on a 5 V DC supply with a tolerance of +/- 5 %. Current consumption stays at or below 350 mA at 24 V DC. A built-in lithium battery (2/3 AA size) provides backup for clock functions. Battery life reaches approximately 5 years. After a low battery indication at 40 °C, autonomy remains under 30 days. The module measures 25 mm high, 143.1 mm wide, and 60.06 mm deep. It weighs just 85.05 g. The housing uses Lexan material with a conformal coating for added durability.
Environmental and Protection Ratings
The 172PNN21022 carries an IP20 rating per IEC 529. It withstands shock of +/- 15 gn for 11 ms and vibration from 57 to 150 Hz at 1 gn. It also resists electrostatic discharge (4 kV contact, 8 kV air) and electromagnetic fields (10 V/m from 80 to 1000 MHz). Operating temperature ranges from 0 to 60 °C. Storage temperature spans -40 to 85 °C. Relative humidity must stay between 5 and 95 % without condensation. Maximum operating altitude is 2000 m.
Why Upgrade Instead of Replace?
Angle D: Replacement and upgrade guide. If your current Modbus Plus adapter fails, replacing the entire Momentum system is costly and disruptive. The 172PNN21022 lets you swap just the adapter module. You keep your existing I/O bases, wiring, and controllers. This approach saves thousands in hardware and labor. It also minimizes downtime because the module installs quickly via the I/O base connection.
Where the 172PNN21022 Fits
This adapter works in manufacturing cells that still use Modbus Plus for peer-to-peer communication. It suits water treatment plants where legacy PLCs control pumps and valves. It also fits packaging lines that need reliable data exchange between drives and controllers. In each case, the 172PNN21022 bridges your Modbus Plus network to the Momentum platform without a full migration.
Installation and Setup
Mount the module onto a compatible Modicon Momentum I/O base. The base supplies the required 5 V DC power. Connect your Modbus Plus cable to the 9-pin D-shell connector. Verify that the communication LED lights up. Keep the module within the specified temperature and humidity range. Avoid condensing conditions. Because the module uses a lithium battery, follow general safety practices during handling.
Maintenance and Reliability
Check the communication LED periodically. Replace the lithium battery every 5 years or sooner if the low battery indicator appears. At 40 °C, autonomy after low battery indication is under 30 days, so plan replacements accordingly. Inspect the connector for corrosion or loose pins. Keep the module clean and dry. The conformal coating helps resist contaminants, but IP20 protection means you should avoid dusty or wet environments. Following these steps extends module life and protects your upgrade investment.
Compatibility and Integration
The 172PNN21022 integrates with Modicon Momentum I/O bases. It communicates over Modbus Plus protocol. It carries UL, CSA, and NEMA 250 type 1 certifications. It also meets IEC 529 standards. If your system uses these networks, the adapter drops in without firmware changes. Always confirm compatibility with your specific Momentum base model before ordering.
Selection Guide
Before buying, verify your I/O base supports the 172PNN21022. Check that your network uses Modbus Plus. Confirm your power supply provides 5 V DC. Also ensure your environment stays within 0 to 60 °C and below 2000 m altitude. SpareTechPLC offers this module and can help you confirm fit. Contact them for current availability and lead times.
Frequently Asked Questions
What is the 172PNN21022 used for?
It adds a Modbus Plus communication port to a Modicon Momentum I/O base.
How long does the battery last?
The lithium battery lasts approximately 5 years. After a low battery indication at 40 °C, autonomy is under 30 days.
What is the power requirement?
The module uses 5 V DC supplied via the I/O base. Current consumption is up to 350 mA at 24 V DC.
Can I install it in a dusty area?
No. The IP20 rating means it needs a clean, dry environment. Avoid condensing humidity.
Does it come with a warranty?
Contact SpareTechPLC for warranty and availability details.
