172JNN21032 | Schneider 5 V DC Serial Link Adapter Module

Introduction to the 172JNN21032

When your control system demands dependable serial communication, the 172JNN21032 from Schneider Electric delivers a compact solution. Part of the Modicon Momentum family, this serial link adapter module bridges your automation platform to RS-232 or RS-485 networks. With a rated supply voltage of 5 V DC and a current consumption of 700 mA at 12 V DC, it fits seamlessly into existing Momentum installations.

Engineered for industrial environments, the module operates in ambient temperatures from 0 to 60 °C and stores safely between -40 and 85 °C. Its IP20 protection class suits control cabinets where dust and moisture are limited. The conformal coating (Humiseal 1A33) adds an extra layer of defense against humidity and contaminants, extending service life and reducing maintenance costs.

Key Features and Technical Specifications

• Rated supply voltage: 5 V DC (input tolerance ±5%)
• Current consumption: 700 mA at 12 V DC
• Communication ports: one RS-232 or RS-485 serial link (selectable)
• Electrical connection: one 9-pin D-shell Modbus Plus connector
• Status indication: one communication LED
• Battery: lithium type (2/3 AA) with ~5-year life
• Operating altitude: up to 2,000 m
• Protection class: IP20 conforming to IEC 529

One standout feature is the lithium battery with a lifespan of approximately five years. This long autonomy minimizes battery replacement frequency, lowering downtime and maintenance labor costs. The module also includes a battery low indication, giving you ample warning—up to 30 days at 40 °C—to plan a replacement without disrupting operations.

Applications and Use Cases

In manufacturing lines, the 172JNN21032 enables reliable data exchange between Momentum controllers and serial devices such as barcode scanners, weigh scales, or operator interfaces. Its RS-485 support allows multi-drop networks over longer distances, reducing cabling costs. For retrofit projects, the module's compact footprint—25 mm high, 143.1 mm wide, and 60.06 mm deep—fits easily into existing panels, saving valuable enclosure space.

Moreover, the module's wide operating temperature range makes it suitable for unheated warehouses or outdoor enclosures (within altitude limits). The conformal coating protects against condensation, which is common in humid climates, thereby preventing corrosion-related failures and reducing warranty claims.

Installation and Setup

Mounting the 172JNN21032 is straightforward. It connects via an I/O base, and the serial port is selectable between RS-232 and RS-485 using onboard configuration. Ensure the supply voltage is within ±5% of 5 V DC to avoid communication errors. Use the 9-pin D-shell connector for Modbus Plus wiring, and verify that the communication LED indicates proper link status after power-up.

For RS-485 networks, terminate the line appropriately and set the correct node address. Always refer to the Modicon Momentum user manual for detailed wiring diagrams and configuration steps. Proper grounding and shielding of serial cables will enhance signal integrity and reduce electromagnetic interference.

Maintenance and Reliability

Routine inspection of the 172JNN21032 should focus on the battery status indicator. When the low battery alarm triggers, schedule a replacement within 30 days to maintain clock accuracy. The module's conformal coating reduces the need for frequent cleaning, but periodic checks for dust accumulation on connectors are recommended.

With a mean time between failures typical of Schneider components, this module offers long-term reliability. The lithium battery's five-year life means you only need to budget for replacement every half-decade, which is a minor cost compared to unexpected downtime. Additionally, the module's resistance to electrostatic discharge (8 kV on air) and electromagnetic fields (10 V/m) ensures stable operation in harsh industrial settings.

Compatibility and Integration

The 172JNN21032 is designed exclusively for the Modicon Momentum automation platform. It supports RS-232 and RS-485 serial protocols, making it compatible with a wide range of industrial devices. The Modbus Plus connector allows integration into Modbus Plus networks, enabling seamless communication with other Schneider equipment.

When integrating, verify that your controller's firmware supports this adapter module. The module's single communication port is sufficient for point-to-point or multi-drop configurations. For larger systems, multiple modules can be used, each handling a separate serial device or network segment.

Troubleshooting Common Issues

If the communication LED fails to illuminate, check the supply voltage and ensure the module is properly seated on the I/O base. For intermittent communication, inspect the serial cable for damage and confirm correct termination. If the battery low indicator appears, replace the lithium battery promptly to avoid losing real-time clock data.

Should you encounter configuration errors, verify the RS-232/RS-485 selection and baud rate settings. The module's input tolerance of ±5% means voltage fluctuations beyond this range can cause erratic behavior. Use a regulated power supply to maintain stable operation.

FAQ

Q: What is the supply voltage for the 172JNN21032?

A: The rated supply voltage is 5 V DC with a tolerance of ±5%.

Q: How much current does the module consume?

A: It consumes 700 mA at 12 V DC.

Q: What communication protocols does it support?

A: It supports RS-232 and RS-485 serial links, selectable via configuration.

Q: What is the battery life?

A: The lithium battery has an approximate lifespan of five years.

Q: What is the operating temperature range?

A: It operates from 0 to 60 °C in non-condensing conditions.

Product Support and Availability

At Petro Auto Tech, we stock the 172JNN21032 and can ship it promptly. Our team can assist with technical questions and provide documentation. Contact us to verify lifecycle status and availability before ordering.