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Allen-Bradley 1768-M04SE CompactLogix SERCOS Interface Module
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- Part Number: 1768-M04SE
- Brand: Allen-Bradley
- Type: Motion Control Modules
- Barcode: USA
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Product Description
Configured for high-speed fiber-optic servo control and multi-axis motion synchronization in CompactLogix 1768 platforms, the Allen-Bradley 1768-M04SE (1768-M04SE SERCOS Motion Module) provides direct physical/electrical execution.
Suffix Breakdown & Model Matrix
| Base Part Number | Suffix | Hardware Revision Description |
|---|---|---|
| 1768-M04SE | Series A / B | 4-Axis SERCOS optical interface module for CompactLogix 1768 platforms |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1768-M04SE |
| Brand | Allen-Bradley |
| Origin | United States |
| Weight | 0.23 kg (0.50 lbs) |
| Dimensions | 132 x 57 x 105 mm (5.20 x 2.23 x 4.14 in) |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 33.6 W |
| Backplane Current Draw | 969 mA at 5.2 VDC (0 mA at 24 VDC) |
| Power Dissipation | 5.04 W |
| Supported Drives | Up to 4 drives (Kinetix 2000, 6000, 7000, Ultra 3000 SERCOS) |
| SERCOS Data Rates | 4 Mbps or 8 Mbps |
| Optical Connector | F-SMA standard screw-type connector |
| Fiber Cable Core | Plastic: 980 um +/- 60 um; Glass: 200 um +/- 4 um |
| SERCOS Class | Class B (Position or Velocity loop execution) |
| Isolation Voltage | 30 V continuous |
Backplane Bus Communication Velocity and Integrated Motion Control
- Backplane Bus Communication Velocity: Transfers deterministic motion trajectories and drive feedback across the 1768 backplane rail with cycle times down to 0.5 ms at 8 Mbps for 4 axes, avoiding scan latency.
- I/O Density Scaling: Supports up to 4 physical SERCOS servo drives and 2 auxiliary feedback axes per module, allowing 1 module on 1768-L43 controllers or up to 2 modules on 1768-L45 controllers.
- Firmware Flash Compatibility: Fully integrated into Studio 5000 / RSLogix 5000 motion control profiles, providing direct drive firmware flash updates and optical loop gain diagnostics.
Frequently Asked Questions
Q: What are the update cycle times supported by the 1768-M04SE module across different transmission rates?
A: At 4 Mbps, update times are 0.5 ms for up to 2 drives and 1 ms for up to 4 drives. At 8 Mbps, the module maintains a 0.5 ms cycle time across all 4 drives.
Q: What power rails does the 1768-M04SE draw from the 1768 backplane?
A: The module draws 969 mA at 5.2 VDC from the backplane logic rail and 0 mA at 24 VDC, dissipating a maximum of 5.04 W of thermal energy.
Q: What fiber-optic cable types and minimum bend radii are specified for the F-SMA optical interface?
A: Supports plastic optical fiber (POF, 25 mm bend radius), nylon-jacketed plastic fiber (40 mm bend radius), and glass optical fiber (HCS, 30 mm bend radius).
Field Installation Guidelines
- Optical Connector Handling: Keep protective dust caps installed on F-SMA fiber-optic connectors until cable attachment. Clean fiber ends with isopropyl alcohol before insertion.
- Fiber Cable Bend Radius: Observe minimum bend radius limits during cable routing (25 mm for unjacketed POF, 30 mm for glass fiber, 40 mm for nylon-jacketed cable) to prevent optical attenuation losses.
- Module Installation: Align the module on the 1768 DIN rail or panel chassis to the left of the processor and press firmly until the upper and lower mounting latches click into place.
- Grounding and Shielding: Ensure the chassis DIN rail or mounting panel is bonded directly to the main cabinet protective earth (PE) ground bar to shield optical transceiver circuitry from external noise.
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