Product Overview

The Allen-Bradley 1769-SM2 serves as a high-efficiency serial communication bridge between 1769-based controllers—including CompactLogix and MicroLogix 1500—and PowerFlex AC drives. By implementing the Drive Serial Interface (DSI) and Modbus RTU protocols, this module provides a deterministic gateway for parameter monitoring and real-time drive control. We offer this unit as 100% Brand New original factory stock, designed specifically to eliminate the need for costly Ethernet adapters on individual drive units.

Technical Specifications

Engineering Advantages

• Multi-Drive Cost Reduction: A single 1769-SM2 manages up to five PowerFlex 4-class drives simultaneously using "Multi-drive mode." This consolidation reduces the required number of I/O modules and backplane current draw, significantly lowering the total hardware investment per axis.

• Architecture Flexibility: Three independent serial channels allow for complex motor control topologies. Engineers can segregate drive networks to optimize bandwidth or group drives by functional zone without adding extra PLC processors.

• Deterministic Parameter Management: The module provides direct access to drive parameters through the 1769 backplane. This enables the PLC to execute rapid start/stop commands and monitor real-time diagnostics—such as output current and fault codes—without the latency associated with standard serial-to-Ethernet converters.

• Compact Footprint Integration: The chassis-less design snaps directly onto a DIN rail. This space-saving form factor integrates seamlessly into existing Compact I/O banks, making it an ideal choice for retrofitting legacy systems or expanding machine-level automation.

• Simplified Configuration: The 1769-SM2 integrates natively into RSLogix 500 and Studio 5000 environments. Pre-defined I/O mapping eliminates manual bit-shuffling, allowing for faster commissioning of complex drive arrays.

FAQs

• Which PowerFlex drives are compatible with the 1769-SM2?

  The module natively supports PowerFlex 4, 40, 400, and 520-series drives. It also interfaces with PowerFlex 7-class drives when used with the appropriate DSI-to-DPI adapter.

• How many drives can I control with one module?

  In Multi-drive mode, you can control up to 5 drives through a single channel. With three channels available, the module provides extensive scalability for centralized motor control.

• Does this module support Ethernet/IP?

  No. The 1769-SM2 is a dedicated serial module for DSI and Modbus RTU. If your architecture requires Ethernet/IP, you would typically use a 20-COMM-E or 25-COMM-E adapter on the drive itself.

• What are the power supply distance requirements?

  You must install the 1769-SM2 within 4 slots of the 1769 system power supply. This ensures the module receives stable 5.1V DC current from the backplane to maintain reliable serial communication.