Allen-Bradley 1768-M04SE CompactLogix SERCOS Interface Module – 4-Axis Motion Control

The Allen‑Bradley 1768‑M04SE is, first and foremost, a high‑performance SERCOS interface motion module purpose‑built for the CompactLogix platform. Engineered specifically to deliver integrated motion control capabilities, this 1768‑M04SE module consequently supports up to four (4) Kinetix servo drives in a single, compact package. As a result, it stands out as an ideal solution for synchronized multi‑axis motion applications, ranging from packaging and material handling to CNC machining and robotic control. Furthermore, this module integrates seamlessly with 1768‑L43 and 1768‑L45 CompactLogix controllers, thereby enabling a cohesive motion‑and‑logic platform without requiring a separate dedicated motion controller.

Technical Specifications & Core Parameters

Turning to its electrical and communication characteristics, the 1768‑M04SE operates as a Class B (Position or Velocity) SERCOS interface device. Moreover, it supports flexible data rates and cycle times to match application demands. Specifically, the key parameters are detailed as follows:

• Supported Drives: Up to four (4) drives, compatible with Kinetix 2000, Kinetix 6000, Kinetix 7000, and Ultra 3000 SERCOS servo drives

• SERCOS Data Rates: Selectable 4 Mbps or 8 Mbps

• SERCOS Cycle Times:

  • 4 Mbps with up to 2 drives: 0.5 ms cycle time

  • 4 Mbps with up to 4 drives: 1.0 ms cycle time

  • 8 Mbps with up to 4 drives: 0.5 ms cycle time

• Control Modes: Position or Velocity (Class B)

• Connections Consumed: Three (3)

• Fiber Optic Connector: F‑SMA standard screw‑type connector

• Backplane Current Draw: 969 mA @ 5.2V DC; 0 mA @ 24V DC

• Power Dissipation: 5.04 W (with total power consumption of 33.6 W including backplane)

• Isolation Voltage: 30V continuous

In addition to these performance ratings, the module offers exceptional flexibility in fiber optic cabling. For instance, it supports both plastic and glass fiber‑optic cables with core diameters of 980 µm ± 60 µm (plastic) and 200 µm ± 4 µm (glass). On the other hand, the operating temperature range for these cables varies: plastic cables withstand ‑55 °C to 85 °C, while glass cables operate from ‑20 °C to 85 °C. Consequently, this wide thermal tolerance allows deployment in diverse environmental conditions, from cold storage facilities to high‑temperature industrial ovens.

Drive Compatibility & System Integration

Moving on to system architecture, the 1768‑M04SE is specifically designed to work within the Allen‑Bradley Kinetix integrated‑motion solution. Notably, it supports the following drive families:

• Kinetix 2000 (2093) – Compact, low‑power servo drives

• Kinetix 6000 (2094) – High‑performance multi‑axis servo drives

• Kinetix 7000 (2099) – High‑power, large‑frame servo drives

• Ultra 3000 (2098) – Digital servo drives with SERCOS interface

Furthermore, when paired with the 1768‑L43 processor, the system supports one (1) instance of the 1768‑M04SE (controlling up to 4 axes). On the other hand, when used with the 1768‑L45 processor, the system supports two (2) module instances, thereby enabling control of up to 8 axes of synchronized motion. This scalability, in turn, allows system integrators to design cost‑effective solutions that grow with production demands.

Fiber Optic Cabling & Physical Installation

For drive connections, the 1768‑M04SE utilizes a fiber‑optic ring network with F‑SMA screw‑type connectors. Specifically, recommended cables include:

• 2090‑SCEPxx‑0 – Non‑jacketed plastic cable

• 2090‑SCVPxx‑0 – Standard jacket (chlorinated polyethylene) plastic cable

• 2090‑SCNPxx‑0 – Nylon jacket plastic cable

• 2090‑SCVGxx‑0 – Standard jacket glass cable

Additionally, careful attention must be paid to bend radius specifications: plastic cables without or with standard jacket require 25 mm; nylon‑jacketed plastic cables require 40 mm; and glass cables require 30 mm. Consequently, proper cable routing ensures signal integrity and prevents costly communication errors.

Regarding physical mounting, the 1768‑M04SE supports both DIN rail and panel mounting options. Its compact dimensions—132 mm × 57 mm × 105 mm (5.2 × 2.23 × 4.14 inches)—allow installation in space‑constrained cabinets. Moreover, the module occupies a single slot in the CompactLogix system and features electronic keying to prevent incorrect module insertion, thereby safeguarding the system during maintenance.

Environmental & Mechanical Ratings

Furthermore, the 1768‑M04SE is built to withstand demanding industrial environments. Its enclosure is rated as Open type, suitable for installation within a protected control panel. Key environmental specifications include:

• Operating Temperature: 0 °C to 60 °C

• Storage Temperature: -40 °C to 85 °C

• Relative Humidity: 5% to 95% (non‑condensing)

• Shock: 30 g operating; Vibration: 2 g @ 10‑500 Hz

What’s in the Box (Packaging List)

When you place an order for the Allen‑Bradley 1768‑M04SE, your package will include the following items:

• (1) 1768‑M04SE CompactLogix SERCOS Interface Module

• (1) Anti‑static protective packaging bag for safe ESD‑safe transport

• (1) Quick‑start installation leaflet, covering LED status indicators and hardware pinout details

(For clarity, please be aware that fiber‑optic cables, connectors, and mounting hardware are sold separately.)

Frequently Asked Questions (FAQ)

Q1: How many drives can the 1768-M04SE control, and which processors are compatible?
The 1768‑M04SE controls up to four (4) SERCOS servo drives. It is compatible with 1768‑L43 (supports 1 module, up to 4 axes) and 1768‑L45 (supports 2 modules, up to 8 axes) CompactLogix controllers.

Q2: What is the difference between 4 Mbps and 8 Mbps operation on the 1768-M04SE?
The 1768‑M04SE supports both data rates. At 4 Mbps, the cycle time is 0.5 ms for up to 2 drives and 1.0 ms for up to 4 drives. At 8 Mbps, the module achieves 0.5 ms cycle time even with 4 drives, thereby providing faster update rates for high‑performance motion applications.

Q3: Which cable types are recommended for the 1768-M04SE fiber‑optic connection?
This module uses F‑SMA screw‑type connectors and supports plastic cables (2090‑SCEPxx‑0, 2090‑SCVPxx‑0, 2090‑SCNPxx‑0) and glass cables (2090‑SCVGxx‑0). Cable selection depends on your environmental conditions—plastic for general use, glass for longer distances or higher temperature stability.

Q4: Can the 1768-M04SE be used with non‑Kinetix SERCOS drives?
While the 1768‑M04SE is optimized for Allen‑Bradley Kinetix drives (Kinetix 2000, 6000, 7000, and Ultra 3000), it follows the standard SERCOS protocol. However, compatibility with third‑party SERCOS drives is not guaranteed, and therefore we strongly recommend using approved Allen‑Bradley drives for reliable operation.

Q5: How do I configure the 1768-M04SE in Studio 5000?
The 1768‑M04SE is configured via Studio 5000 Logix Designer (or RSLogix 5000) by adding the module to the I/O tree under the CompactLogix controller. You must select the appropriate data rate (4 or 8 Mbps), configure axis properties, and set up electronic keying. Refer to the module's installation instructions for detailed step‑by‑step procedures.