Product Brief: 1769-SM2 DSI/Modbus Module
The Allen-Bradley 1769-SM2 is a Compact I/O communication module. It enables CompactLogix and MicroLogix 1500 controllers to communicate over DSI or MODBUS RTU. This module interfaces directly with PowerFlex 4-class and PowerFlex 7-class drives. It supports single or multi-drive configurations. The module mounts on DIN rail or panel. It draws 350 mA at 5V DC from the backplane. Operating temperature ranges from -10 to 50 °C. The 1769-SM2 is a single-slot module with three communication channels. It supports up to 15 drives (5 per channel).
Technical Specifications
- Brand: Allen-Bradley (Rockwell Automation)
- Model: 1769-SM2
- Series: CompactLogix
- Module Type: DSI / MODBUS Communication Module
- Supported Protocols: Drive Serial Interface (DSI), MODBUS RTU
- DSI Data Rate: 19200 bps
- MODBUS Rates: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400 bps
- Current Draw: 350 mA @ 5V DC; 0 mA @ 24V DC
- Power Supply Distance Rating: 4 modules
- Max Cable Distance (DSI): 10 m (32.8 ft) to drives
- Max Cable Distance (MODBUS): 1219 m (4000 ft) on twisted-pair
- Mounting: DIN Rail or Panel
- Operating Temp: -10 to 50 °C (14 to 122 °F)
- Storage Temp: -40 to 85 °C (-40 to 185 °F)
- Vibration: 5g @ 10-500 Hz
- Shock: 30g @ 11 ms
- Dimensions (HxWxD): 4.65 x 3.43 x 3.43 in
- Weight: 5 oz (approx.)
- UPC: 820919134630
Compatibility & Installation Guidelines
- Controllers: CompactLogix, MicroLogix 1500
- Drives: PowerFlex 4-class and PowerFlex 7-class (with 20-COMM-H RS485)
- Installation: Local I/O for MicroLogix 1500; remote I/O for CompactLogix
- Must be within 4 modules of the power supply
- Use copper wire (22-14 AWG solid, 22-16 AWG stranded)
- Avoid corrosive gas, vapors, or dust environments
- Only one 1769-SM2 needed for up to 15 drives (5 per channel)
Oiltech Controls’s Insight
- This module excels in multi-drive networks where space is limited.
- Its DSI and MODBUS flexibility reduces cabling and engineering effort.
- We recommend using it with PowerFlex 4/7 drives for seamless integration.
- For legacy systems, it provides a cost-effective upgrade path.
- Proper termination and surge suppression enhance field reliability.
Typical Applications
- Multi-drive conveyor control systems
- Pump and fan arrays with PowerFlex drives
- Retrofit projects for older MODBUS networks
- Distributed I/O over long cable runs
- CompactLogix-based machine control
Professional FAQ (Experience-Based)
- Q: Can I mix DSI and MODBUS devices on the same module?
No, the 1769-SM2 operates in either DSI or MODBUS mode, not both simultaneously. Choose based on your drive network. - Q: How many drives can I connect per channel?
Up to five PowerFlex 4-class drives per channel, total 15 drives. For PowerFlex 7-class, use a 20-COMM-H adapter. - Q: What is the practical cable length for reliable MODBUS?
We advise staying under 1000 m for RS485 networks. The module supports 1219 m but real-world performance drops with noise. - Q: Do I need external termination resistors?
Yes, for MODBUS networks longer than 100 m, install 120-ohm termination at both ends to prevent reflections. - Q: Can I update firmware via this module?
Only ControlFLASH via the CompactLogix backplane supports firmware updates; DSI does not support it.
Why Buy From Oiltech Controls?
- 15+ years of industrial automation experience.
- Global shipping via FedEx, UPS, or DHL.
- Every item is tested and verified before dispatch.
- 12-month warranty on all products.
- We support obsolete systems with expert knowledge.
- Refurbished units available with surplus quality.
Order & Shipping Information
- Shipping: FedEx, UPS, or DHL worldwide.
- Dispatch Time: 24-28 hours after order confirmation.
- Packaging: Anti-static, cushioned for industrial safety.
- Tracking number provided on shipment.
Contact & Support
For inquiries: info@oiltechcontrols.com | +86 158 8020 0923 (WhatsApp)
Copyright © 2026 Oiltech Controls Limited. https://www.oiltechcontrols.com/ All rights reserved.
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