1768-M04SE | Allen-Bradley CompactLogix 4 Axis Sercos Interface Module

The 1768-M04SE is a SERCOS interface motion module designed for CompactLogix systems. It enables control of up to four servo axes by interfacing with Allen-Bradley Kinetix drives. This module provides high-speed, synchronized motion control over a fiber-optic ring. It supports both position and velocity control modes, making it suitable for precise automation tasks. The module is typically used in applications requiring tight coordination of motion, such as robotics, packaging, and material handling.

The 1768-M04SE is designed to work with CompactLogix controllers, specifically the 1768-L43 and 1768-L45. When paired with the 1768-L43, only one motion module can be installed; with the 1768-L45, up to two can be used. The controller communicates with the SERCOS module over the 1768 backplane. This configuration enables modular and scalable motion systems. Integration with RSLogix 5000 or Studio 5000 software simplifies configuration and diagnostics.

This module uses fiber-optic cables with F-SMA screw-type connectors. It supports both plastic and glass types depending on application needs. Plastic cables with or without jackets have a bend radius of 25–40 mm, while glass cables require 30 mm. The fiber type affects installation constraints and environmental tolerance. Cables such as 2090-SCEPxx-0 (plastic) or 2090-SCVGxx-0 (glass) are typically used.

The 1768-M04SE draws 969 mA from the 5.2V backplane supply. It does not consume 24V DC backplane current directly. Its power dissipation is approximately 5.04 Watts. The power is used to operate internal electronics and drive the fiber-optic interface. Ensure the CompactLogix power budget accommodates this draw when designing a system.

No, the 1768-M04SE was officially discontinued by Rockwell Automation on December 31, 2020. This means it is no longer available for purchase from the manufacturer or official distributors. Users are advised to remove references to it in current and future designs. Spare parts may still be found through secondary markets or surplus vendors. For new systems, migration to a newer platform is strongly recommended.

Rockwell Automation categorizes the replacement as an "Engineering Replacement," meaning no direct drop-in alternative exists. Instead, users are encouraged to migrate to the CompactLogix 5380 platform with CIP Motion or use Kinetix 5500/5700 drives with integrated EtherNet/IP motion. These modern architectures offer better performance, higher speed, and simplified integration. Choosing the right alternative depends on the number of motion axes, performance requirements, and system architecture. Always consult the Rockwell Migration Guide or local distributor for proper migration planning.