Order now the 2085-ECR, the essential termination component for the Allen-Bradley Micro850 and Micro870 expansion I/O bus system.
What Is the 2085-ECR?
The 2085-ECR is a high-quality bus terminator (Right End Cap) required for the proper operation of the Micro850 and Micro870 expansion I/O system. Its primary function is to terminate the high-speed communication bus at the end of the expansion I/O bank, preventing signal reflection and ensuring data integrity across all connected modules. Without this component, the PLC will trigger a bus fault and stop communication with the expansion rack.
Key Technical Specifications
- Module Type: Right End Cap / Terminator
- Compatibility: Micro850 (2085) and Micro870 Expansion I/O
- Mounting: DIN Rail or Panel Mount
- Dimensions: 44.5 x 28 x 105 mm
- Current Draw: Minimal (Passive termination)
- Vibration Resistance: 2g @ 10…500Hz
Installation and System Integrity
The 2085-ECR must always be the last module on the right side of the 2085 expansion bus. It slides into the side connector of the last I/O module and locks into place. In industrial environments with high electrical noise, the 2085-ECR provides the necessary impedance matching to maintain the 20Mbps backplane speed required for high-performance automation tasks.
Installation Advice
Always ensure the PLC power is disconnected before sliding the 2085-ECR onto the bus. Check that the locking tabs are fully engaged; a loose end cap is one of the most common causes of intermittent «Expansion I/O Not Found» errors in Rockwell CCW diagnostics. Use a DIN rail end anchor to prevent the entire stack from shifting.
Frequently Asked Questions
Q: Can I run my Micro850 expansion rack without the 2085-ECR?
A: No, the 2085-ECR is mandatory for completing the electrical circuit of the backplane. The system will report a hardware fault if it is missing.
Q: Is the 2085-ECR compatible with 2080 plug-ins?
A: No, this is specifically for the 2085 Expansion I/O modules used with larger Micro800 controllers.
Do you need more references from this brand? Explore our full catalog of Allen-Bradley here: https://atlantechdrives.com/manufacturers/allen-bradley/
