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CI840A
CI840A
CI840A

ABB CI840A S800 Redundant Fieldbus Communication Interface

  • Model: CI840A (3BSE041882R1)
  • Brand: ABB
  • Series: S800 I/O
  • Core Function: Redundant PROFIBUS DP-V1 fieldbus interface
  • Product Type: Redundant FCI
  • Key Specs: Module redundancy, line redundancy, up to 12 I/O modules
  • Condition: New Original / New Surplus
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Description

Key Technical Specifications

  • Fieldbus Protocol: PROFIBUS DP/DPV1
  • Redundancy: Module and line redundancy
  • I/O Capacity: Max 12 single I/O modules or 6 redundant pairs
  • Baud Rates: Up to 12 Mbit/s
  • Hot Swap: Supported
  • HART Pass-through: Yes
  • Hot Configuration: In Run supported
  • Power Supply: Isolated supply to I/O modules
  • Dimensions: Standard S800 FCI footprint
  • Mounting: With TU846/TU847 termination units

Product Introduction

The ABB CI840A (3BSE041882R1) is a redundant Fieldbus Communication Interface for S800 I/O on PROFIBUS DP-V1. It handles signal processing, I/O supervision, and provides redundant paths to the controller.

It is the go-to module for redundant S800 I/O stations where high availability is required. The design supports online configuration changes and HART integration while keeping the station operational during single failures.

CI840A
CI840A
CI840A
CI840A

Troubleshooting Quick Reference

Symptom Possible Cause Relevance to this Part Quick Check Method Recommendation
Redundancy switchover failure One FCI not healthy ✅ High Check PRIM/DUAL LEDs on both units Verify power and bus connections to secondary FCI
No PROFIBUS comms Address or cable fault ✅ High Monitor Rx/Tx LEDs and PROFIBUS diagnostics Confirm station address and bus termination
I/O modules offline ModuleBus issue ✅ Medium Inspect electrical/optical ModuleBus Reseat cables and modules
HART not working Pass-through disabled ✅ Medium Check asset management tool scan Enable HART routing in FCI parameters
Frequent alarms Power or grounding ❌ Low Measure supply voltage at TU Check fused inputs and station grounding

Include station diagnostics, LED status photos, and configuration files when contacting support.

Frequently Asked Questions (FAQ)

What termination units pair with the CI840A? Use TU846 for redundant I/O or TU847 for non-redundant I/O configurations.

How does redundancy work with two CI840A modules? One acts as primary and the other as backup. Automatic switchover occurs on failure while maintaining I/O communication.

Is hot swap possible? Yes for both the FCI modules and I/O modules in redundant setups. Follow ABB hot insertion procedures.

Can it handle optical ModuleBus? Yes, with appropriate TB842 units for extended clusters.

Why choose New Surplus for this module? Immediate stock of genuine ABB new units, fully tested in S800 redundant configurations, with documentation and 1-year warranty.

What is the difference between CI840A and CI801? The CI840A adds full redundancy (module and line) for higher availability applications.

Field advice before replacement? Photograph both primary and backup setups, note the station address on the rotary switches, and verify both PROFIBUS segments are healthy. Use ESD protection and confirm firmware match.

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