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.
| Feature | Specification |
| Catalog Number | 1769-SM2 |
| Protocol Support | Drive Serial Interface (DSI) & Modbus RTU |
| Communication Channels | 3 Independent Serial Channels |
| Modbus RTU Speeds | 300 to 38,400 bps (Configurable) |
| DSI Speed | Fixed at 19.2 kbps |
| Drive Capacity | Up to 5 PowerFlex drives (Multi-drive mode) |
| Backplane Current | 350 mA @ 5.1V DC |
| Power Supply Distance | Within 4 slots of the 1769 Power Supply |
| Compatibility | PowerFlex 4, 40, 400, 520-series, 7-class |
| Operating Temp | -10°C to +50°C (14°F to 122°F) |
| Status Indicators | LED array for Module Health and Channel Activity |
| Weight | 0.17 kg (0.37 lbs) |
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.
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.
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