The Schneider Electric 171CBU98091 is a Compact Unity M1E processor in the Modicon Momentum automation platform. This CPU module offers versatile communication including Ethernet, USB, and serial RS‑232/485, making it well-suited for distributed industrial control with native Modbus RTU/TCP and Global Data support. Its powerful Spear 320s core, large memory, and rich diagnostics enable responsive, scalable control in energy, manufacturing, and infrastructure environments.
Key Features:
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Model: 171CBU98091 (Unity M1E Processor)
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Platform: Modicon Momentum, compatible with STB I/O systems
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Processor: Spear 320s, 333 MHz, 32‑bit word length
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Memory: 3,584 kB program/data RAM; supports up to 2,048 I/O points
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Communications:
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Ethernet RJ45, 10/100 Mbps, Modbus TCP/IP & Global Data
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Serial RS‑485/RS‑232 mini‑DIN for Modbus RTU/ASCII
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USB port for direct programming via Unity Pro
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Performance:
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Modbus messaging at 125 words/s and 200 I/O messages/s
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Global Data at 2,200 I/O messages/s
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Diagnostics & Web Services: CPU, Ethernet, bandwidth, and system health monitoring with integrated web interface
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I/O Capacity: Supports 2,048 digital and 2,048 analog I/O via Momentum/STB modules
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Mounting: 35 mm symmetrical DIN-rail (IP20), width 144 × 60.6 × 53.5 mm, weight 0.163 kg
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Indicators: Multi-LEDs – RUN, ERR, I/O fault, Ethernet status & data rate
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Power: Requires 4.75–5.25 V DC, draws approx. 500 mA
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