Allen-Bradley 1768-M04SE​ vs 1768-M16SE – Cost-Effective 4-Axis SERCOS II Motion Module for Small to Mid-Size Machine Automation

Product Overview

The Allen-Bradley 1768-M04SE​ (including the /A revision, catalog number 1768-M04SE Ser A) is a SERCOS II (Serial Real-time Communication System) interface module designed for use in Rockwell Automation’s 1768 CompactLogix programmable automation controller chassis. It provides a dedicated high-speed, deterministic motion network link between a CompactLogix controller—such as the 1768-L43, 1768-L45, or 1768-L55—and up to four axes of Kinetix 6000, Kinetix 6200, or Kinetix 6500 series servo drive systems over a fiber-optic SERCOS ring or star topology. The Allen-Bradley 1768-M04SE​ offloads real-time motion command and feedback handling from the main CPU, enabling tightly synchronized multi-axis positioning, electronic gearing, camming, and interpolation without impacting scan time of the logic program.Physically, the Allen-Bradley 1768-M04SE​ occupies a single slot in the 1768 rack and communicates with the CompactLogix backplane at 125 Mbps, drawing approximately 650 mA from the 5 V DC backplane supply and negligible current from the 24 V DC external supply. It features two duplex SC-type fiber optic ports (SERCOS IN and SERCOS OUT) forming a redundant ring to the drive nodes, operating at the standard SERCOS II transmission rate of 4 Mbps with support for both Phase 1 and Phase 2 telegram structures. The module’s firmware integrates transparently with RSLogix 5000 / Studio 5000 Logix Designer, where axes mapped to the Allen-Bradley 1768-M04SE​ appear as native motion objects—allowing tag-based motion instructions (MAM, MAJ, MAG, CAM, etc.) without third-party configuration tools.Engineered for demanding machine automation environments, the Allen-Bradley 1768-M04SE​ is electrically isolated between the SERCOS fiber ports and the backplane logic, carries UL/cUL and CE markings, and is rated for installation in NEMA / IP20 enclosures within ambient temperatures of 0 °C to +60 °C. Its combination of deterministic fiber-optic communication, simplified axis commissioning through DriveExplorer / DriveExecutive, and proven interoperability with Rockwell’s integrated motion portfolio makes the Allen-Bradley 1768-M04SE​ a cornerstone component in packaging lines, converting machinery, assembly test stands, and web-handling equipment that require coordinated servo motion under CompactLogix control.

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Description

 

Technical Specifications

Product Model | 1768-M04SE (1768-M04SE/A)Manufacturer | Allen-Bradley / Rockwell AutomationProduct Type | CompactLogix SERCOS II Interface Module (Motion Communication)Compatible Controllers | 1768-L43, 1768-L45, 1768-L55 CompactLogix PACsMaximum Servo Axes Supported | 4 axes (per module; multiple modules can be added per chassis if controller memory permits)SERCOS Standard | SERCOS II (IEC 61491), Phase 1 & Phase 2 telegrams supportedSERCOS Data Rate | 4 MbpsFiber Optic Interface | 2 × Duplex SC (62.5/125 µm multimode fiber); SERCOS IN / SERCOS OUT for ring or star connectionTypical Fiber Link Length | Up to 80 m (260 ft) per segment with 62.5 µm MMF; refer to Kinetix drive manual for exact budgetBackplane Communication | 1768 CompactLogix Backplane, 125 MbpsBackplane Current Draw | 650 mA max @ 5 V DC; 0 mA @ 24 V DC (external 24 V DC not required for module operation)External Power Requirement | None (powered from backplane); 24 V DC may be present on chassis power supply but not consumed by moduleIsolation (SERCOS Ports to Backplane Logic) | 500 V AC continuous, 1500 V AC for 1 min (reinforced optical isolation via fiber)Indicators | MOD – Module Status (Solid Green = OK, Flashing = Configuring, Red = Fault), SERCOS – Network Status, Link/Act per port dependent on drive feedbackSlot Position | Any available 1768 rack slot (right of processor); left-most slot typically reserved for processorOperating Temperature | 0 °C to +60 °C (+32 °F to +140 °F)Storage Temperature | -40 °C to +85 °CRelative Humidity (non-condensing) | 5 % – 95 % RHDimensions (H × W × D) | 138 mm × 34 mm × 132 mm (5.44″ × 1.34″ × 5.20″)Weight | Approx. 0.22 kg (0.48 lb)Mounting | 1768 CompactLogix Chassis / Rack (snap-in)Enclosure Rating | IP20 (install inside control cabinet)Certifications | UL Listed, cULus, CE Marked, RoHS Compliant, C-Tick

Main Features and Advantages

Integrated SERCOS II motion networking: The Allen-Bradley 1768-M04SE​ provides a native, deterministic SERCOS II fiber-optic link between the CompactLogix controller and Kinetix 6000-family servo drives. By using an industry-standard motion bus with hard-real-time characteristics, the Allen-Bradley 1768-M04SE​ guarantees jitter-free command delivery and feedback sampling—critical for coordinated multi-axis moves such as electronic cam profiles, linear/circular interpolation, and master-slave gearing found in high-speed packaging and converting equipment.Four-axis scalability per module: Each Allen-Bradley 1768-M04SE​ supports up to four independently controlled servo axes. For machines requiring more axes, additional Allen-Bradley 1768-M04SE​ modules can be installed in the same 1768 chassis (subject to controller memory and rack slot availability), allowing modular expansion from simple 2-axis indexing to complex 12- or 16-axis coordinated systems without changing the controller platform.Seamless Logix integration & tag-based motion: Once the Allen-Bradley 1768-M04SE​ is added to an RSLogix 5000 / Studio 5000 project, servo axes appear as Motion Group objects with full tag-based access. Standard motion instructions—Motion Axis Move (MAM), Motion Axis Jog (MAJ), Motion Axis Gear (MAG), Cam (CAM), etc.—are executed directly against axes on the Allen-Bradley 1768-M04SE, eliminating the need for separate motion controllers or custom messaging. Drive parameters can be viewed and edited online via DriveExplorer integration.Robust fiber-optic ring topology: The dual SC ports on the Allen-Bradley 1768-M04SE​ allow daisy-chaining drives in a SERCOS ring. If a single fiber break occurs (depending on drive ring-wrap configuration), communication can often continue or be quickly diagnosed. Optical isolation also prevents ground loops and makes the Allen-Bradley 1768-M04SE​ immune to electromagnetic interference from VFDs, welders, and high-current switching devices common on the plant floor.Diagnostic visibility: Front-panel status LEDs on the Allen-Bradley 1768-M04SE​ indicate module health (MOD) and SERCOS network state. Detailed diagnostic tags—such as drive communication status, missed telegrams, and servo fault codes—are available in the controller tag database for use in operator HMI screens or alarm logic, helping maintenance teams identify ring breaks, missing drives, or tuning issues rapidly.

Application Field

The Allen-Bradley 1768-M04SE​ is deployed wherever a CompactLogix-based machine requires precise, coordinated motion control of multiple servo axes over a noise-immune, deterministic network. In high-speed packaging lines—case packers, cartoners, flow wrappers, and rotary fillers—the Allen-Bradley 1768-M04SE​ connects to Kinetix 6000 servo drives controlling flight-chain conveyors, rotary turrets, pick-and-place delta robots, and cutoff knives, executing electronic cam profiles that replace mechanical line shafts and allow recipe-driven format changes. Converting and web-handling machinery such as slitter-rewinders, coaters, and laminators use the Allen-Bradley 1768-M04SE​ to coordinate unwind/rewind tension axes with dancer-position feedback and draw-roll servos, maintaining register accuracy at line speeds exceeding 300 m/min.Assembly and test equipment in automotive and electronics manufacturing employ the Allen-Bradley 1768-M04SE​ for multi-axis press positioning, vision-guided part alignment stages, and torque/angle-controlled tightening spindles where servo feedback must be tightly synchronized with logic execution. Print and label applicator machines rely on the Allen-Bradley 1768-M04SE​ to synchronize print-head timing with product-flow encoders and apply-label nip rolls. In legacy retrofit scenarios, the Allen-Bradley 1768-M04SE​ is often chosen to replace standalone motion controllers or parallel PLC-plus-motion architectures, consolidating logic and motion into a single CompactLogix PAC while preserving investment in Kinetix 6000 SERCOS-capable drives. Because the module is fully supported by Rockwell’s Integrated Architecture, projects using the Allen-Bradley 1768-M04SE​ can be migrated forward to newer ControlLogix + Kinetix platforms with minimal re-engineering, protecting the user’s application development effort.

Contact Us WhatsApp / Wechat：+86 18150087953
Phone：+86 18150087953
Email：sales@cxplcmro.com

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