Schneider 171CBU98090 Overview
The Schneider 171CBU98090 is a robust automation platform from the Modicon Momentum series. It delivers reliable communication and control for diverse industrial applications. This PLC supports up to 2048 inputs and 2048 outputs, making it a strong fit for extensive operations. Engineers appreciate its balance of performance and compact design.
This module runs on a 333 MHz clock, which ensures fast processing of control logic. It provides 3584 kB of program memory, enough for complex sequences and data handling. The unit also supports Modbus and Modbus TCP protocols, enabling seamless integration with existing systems.

Key Technical Specifications
The 171CBU98090 offers a range of specs that matter to automation professionals. Below, we break down the most critical details.
-
I/O Capacity: 2048 inputs and 2048 outputs for large-scale control.
-
Memory: 3584 kB program memory for intricate applications.
-
Clock Frequency: 333 MHz for efficient processing.
-
Supply Voltage: 4.75-5.25 V DC, ensuring stable operation.
-
Mounting: 35 mm symmetrical DIN rail for easy installation.
-
Communication Ports: RS232/485, Ethernet, and USB for versatile connectivity.
-
Protocols: Modbus and Modbus TCP, with 1-247 Modbus addressing.
-
Topology: Multidrop Modbus and star Modbus TCP configurations.
-
I/O Bus: Supports Modicon STB I/O for extended flexibility.
Build Quality and Certifications
Schneider designed this module with durability in mind. The IP20 rating protects against solid objects larger than 12 mm, suitable for control cabinets. It meets stringent standards, including CE, FM, C-Tick, UL 508, and CSA C22.2 No 142. Compliance with EN/IEC 61131-2 further confirms its reliability for industrial use.

The unit weighs only 0.94 kg and measures 144 x 53.47 x 60.6 mm. This compact footprint allows for space-efficient panel layouts. You can mount it easily on a standard 35 mm DIN rail, simplifying installation and maintenance.
Connectivity and Communication
Communication is a core strength of the 171CBU98090. It supports both Modbus and Modbus TCP, which are widely used in industrial networks. The module can act in multidrop Modbus or star Modbus TCP topologies, offering flexibility in network design. Each device gets a unique IEEE global address for Modbus TCP, ensuring clear identification.
The inclusion of RS232/485, Ethernet, and USB ports allows direct connection to programming tools and higher-level systems. This versatility helps engineers integrate the PLC into new or existing architectures without hassle.
Practical Applications
Given its high I/O capacity and robust communication, this PLC suits applications like material handling, packaging, and process control. Its support for Modicon STB I/O expands its reach to distributed I/O setups. Whether you are upgrading a legacy system or designing a new line, the 171CBU98090 offers a dependable foundation.
For procurement teams, this module provides a cost-effective solution without compromising on features. Its certifications ensure compliance across multiple regions, reducing project risk. Overall, the Schneider 171CBU98090 stands out as a versatile and reliable choice for modern automation needs.