Communication Module 1769-SM2 Allen-Bradley

Product Overview

The 1769-SM2 is a high-performance serial communication module for bridging 1769-based controllers with PowerFlex AC drives. Supporting both Drive Serial Interface (DSI) and Modbus RTU protocols, it enables control of up to five drives per module in multi-drive mode. This module is essential for machine builders using MicroLogix 1500 or CompactLogix systems who require drive parameter monitoring and control over a serial network without occupying additional network nodes.

Technical Specifications

Network and Integration Capabilities

The 1769-SM2 converts Logix backplane data into serial packets for DSI or Modbus RTU communication. In multi-drive mode, it reduces hardware footprint by consolidating multiple PowerFlex units into a single slot.

• MicroLogix 1500: Functions as a local expansion module.

• CompactLogix: Usable in local chassis or remote 1769 I/O assemblies.

• Parameter Access: Full access to drive parameters for real-time monitoring and configuration via RSLogix 500 or Studio 5000.

Installation Guidelines

• Place the module within four slots of the system power supply to maintain 5 V DC bus integrity.

• Use shielded twisted-pair cabling for all DSI and Modbus connections to minimize EMI in motor control environments.

Common Technical Questions

Can the 1769-SM2 control PowerFlex 525 drives?
Yes, it can communicate via DSI, though modern applications typically use 1769-LxxER controllers' Ethernet ports for improved performance.

Does this module support Modbus TCP?
No. The 1769-SM2 is serial-only. For Modbus TCP, use a CompactLogix 5370 Ethernet port with Open Sockets or a third-party gateway.