Schneider 172PNN21022 – Modbus Plus Adapter Overview
The Schneider 172PNN21022 is a Modbus Plus adapter module from the Modicon Momentum platform. It provides a single communication port for Modbus Plus networks, making it a straightforward addition to existing automation setups. This review covers its primary features and practical value based on the manufacturer's specifications.
Key Features and Design
The module uses a 9-pin D-shell connector for Modbus Plus communication. It requires a 5 V DC rated supply voltage with a tolerance of +/- 5 percent. According to the specifications, the current consumption ranges from 200 to 350 mA at 24 V DC, though the module itself is supplied via the I/O base. This design simplifies wiring and reduces the number of external connections needed.
A single LED provides local communication status indication. The housing is made of Lexan and features a conformal coating for added protection. With an IP20 rating, the device is intended for use in controlled environments, such as inside an enclosure or cabinet. Its compact dimensions (25 mm height, 143.1 mm width, 60.06 mm depth) and light weight (85.05 g) allow for easy integration into existing panels.
Environmental and Electrical Specifications
The Schneider 172PNN21022 operates within an ambient temperature range of 0 to 60 °C and can be stored at temperatures from -40 to 85 °C. It tolerates relative humidity from 5 to 95 percent without condensation. The module also withstands vibrations and shocks typical of industrial settings, with vibration resistance from 1 gn (57–150 Hz) and shock resistance of +/- 15 gn for 11 ms half-sine wave acceleration.
For electrical safety, the dielectric strength is rated at 500 V DC. The device meets several standards, including IEC 529, UL, CSA, and NEMA 250 type 1. It also includes an internal lithium battery with an estimated life of 5 years. The battery maintains the clock drift within +/- 13 seconds per day accuracy and provides less than 30 days of autonomy after a low-battery indication at 40 °C.
Practical Value for Automation Engineers
For engineers working with Modicon Momentum systems, the 172PNN21022 offers a reliable, compact solution for adding Modbus Plus connectivity. Its straightforward design and clear specifications make it easy to plan for integration. The conformal coating adds a layer of durability, while the IP20 rating reminds users to install it in a protected location. The long battery life reduces maintenance intervals, which is a practical benefit for continuous operations.
Overall, the Schneider 172PNN21022 delivers essential Modbus Plus communication in a small, well-built package. It suits applications where space is limited and reliability is critical. This module is a solid choice for system integrators and maintenance teams looking to expand or maintain Modicon Momentum networks.