Product Overview
The Allen-Bradley 1756-M08SE is a ControlLogix SERCOS interface module designed to connect a ControlLogix rack directly to SERCOS-based servo drives. This module supports up to eight axes per module and up to 32 axes per controller, making it a scalable solution for multi-axis motion control applications. With dual data rates of 4 Mbps and 8 Mbps, the 1756-M08SE provides flexible performance to match your system requirements.
Part of the ControlLogix series from Rockwell Automation, the 1756-M08SE integrates seamlessly with Kinetix servo drives, including the 2093 Kinetix 2000, 2094 Kinetix 6000, 2099 Kinetix 7000, and 2098 Ultra3000. It supports position, velocity, and torque control modes, enabling precise motion control across diverse industrial applications.
Technical Specifications
Below are the key technical specifications for the Allen-Bradley 1756-M08SE, sourced directly from the manufacturer:
| Parameter |
Value |
| Manufacturer |
Rockwell Automation |
| Module Type |
SERCOS Interface Module |
| Series |
ControlLogix |
| Part Number |
1756-M08SE |
| Supported Data Rates |
4 Mbps; 8 Mbps |
| Axes per Module |
8 |
| Axes per Controller |
32 |
| Drive Control Modes |
Position, velocity, and torque |
| SERCOS Data Rate |
4 or 8 Megabits-Second |
| Backplane Current (24V) |
2.5 milliamps |
| Backplane Current (5V) |
760 milliamps |
| Current Draw (5.1V) |
1.2 amps |
| Power Dissipation |
5.0 Watts |
| Thermal Dissipation |
21.2 BTU-hour |
| Isolation Voltage |
50 Volts Continuous |
| Enclosure |
None (open-type) |
SERCOS Cycle Times
Cycle times vary with data rate and the number of connected drives:
-
@ 4 Mbps: 0.5 ms up to 2 drives; 1 ms up to 4 drives; 2 ms up to 8 drives
-
@ 8 Mbps: 0.5 ms up to 4 drives; 1 ms up to 8 drives; 2 ms up to 16 drives
Compatibility & Integration
The 1756-M08SE is designed for use with ControlLogix chassis, including models 1756-A4, 1756-A7, 1756-A10, 1756-A13, and 1756-A17. It works with standard power supplies (1756-PA72/C, 1756-PA75/B, 1756-PB72/C, 1756-PB75/B, 1756-PC75/B, 1756-PH75/B) and redundant power supplies (1756-PA75R, 1756-PB75R, 1756-PSCA2).
For SERCOS communication, the module uses fiber-optic cables. Compatible media include plastic fiber-optic cables (2090-SCEPxx-0, 2090-SCVPxx-0, 2090-SCNPxx-0) and glass fiber-optic cables (2090-SCVGxx-0). This module supports reliable noise immunity and high-speed data transmission, and it does not require interconnected wiring between drives.
Industry Applications
The Allen-Bradley 1756-M08SE is ideal for applications requiring precise multi-axis motion control, such as packaging machinery, material handling, and automated assembly lines. Its support for position, velocity, and torque modes makes it suitable for applications ranging from simple indexing to complex coordinated motion.
With the ability to manage up to 8 drives per module and 32 axes per controller, the 1756-M08SE scales easily as your production needs grow. The dual data rates allow you to optimize cycle times based on the number of drives and the required performance.
Installation & Setup Guidance
Installing the 1756-M08SE is straightforward. Insert the module into any available slot in a compatible ControlLogix chassis. Ensure the chassis is powered off during installation to avoid damage. Connect the SERCOS fiber-optic cables to the module's ports, observing proper polarity. Configure the module using RSLogix 5000 or Studio 5000 software, setting the data rate and cycle time according to your drive configuration. Verify that the power supply meets the module's backplane current requirements.
Maintenance & Reliability
The 1756-M08SE is built for industrial environments. It operates within a temperature range of 0 to 60 °C and can be stored between -40 and 85 °C. The module withstands vibration of 2 g at 10 to 500 Hz and shock of 30 g operating, 50 g non-operating. To ensure long-term reliability, periodically inspect fiber-optic connections for dirt or damage, and keep the module free of dust. The open-type enclosure requires mounting in a suitable cabinet to protect against contaminants.
Selection Guide & Purchasing Advice
Before purchasing the 1756-M08SE, verify compatibility with your existing ControlLogix chassis and power supplies. Confirm that your drives are SERCOS-compatible and that you have the correct fiber-optic cables. For expert advice and genuine parts, rely on PLC Source PRO as your trusted supplier. We offer fast shipping and quality assurance on all automation components.