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CI820V1 3BSE025255R1
CI820V1 3BSE025255R1
CI820V1 3BSE025255R1

ABB CI820V1 3BSE025255R1 AF100 Redundant Fieldbus Interface

  • Model: CI820V1 (3BSE025255R1)
  • Brand: ABB
  • Series: S800 I/O / System 800xA / Advant OCS
  • Core Function: Redundant AF100 fieldbus communication
  • Product Type: Redundant Field Communication Interface (FCI)
  • Key Specs: AF100 protocol, 1.5 Mbit/s communication, redundant architecture, 16 MHz processor, 0.5 MB SRAM
  • ⚠️ Obsolete Model – Limited Stock Available
  • Condition: New Original / New Surplus or Factory Tested Refurbished
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Description

Key Technical Specifications

Parameter Value
Manufacturer ABB
Model CI820V1
Product ID 3BSE025255R1
Product Type S800 Redundant Field Communication Interface (FCI)
Communication Protocol Advant Fieldbus 100 (AF100)
Communication Speed 1.5 Mbit/s
Processor 16 MHz
Memory 0.5 MB FPROM, 0.5 MB SRAM
Network Interface Single AF100 modem
Redundancy Two CI820V1 modules required for redundant operation
Compatible Systems ABB S800 I/O, System 800xA, Advant OCS, AC460
Net Weight Approximately 0.6 kg

The CI820V1 is an S800 Redundant Field Communication Interface (FCI) for the AF100 network. ABB specifies that two CI820V1 modules must be installed to create a redundant communication pair, and the module ships with the basic system software preloaded.

 

Product Introduction

The ABB CI820V1 (3BSE025255R1) is a redundant communication interface designed for the S800 I/O platform. It connects distributed I/O stations to the Advant Fieldbus 100 (AF100) network, providing reliable communication for ABB System 800xA and legacy Advant OCS control systems.

Unlike the CI810B, which provides a standard AF100 interface, the CI820V1 is intended for high-availability applications. When installed as a redundant pair, communication can continue if one interface or communication path fails, helping reduce process interruptions during hardware faults or maintenance.

 

Installation & Configuration Guide

 

Stage 1 – Pre-Installation Preparation (10 Minutes)

⚠️ Safety First

  1. Notify plant operations of the scheduled maintenance.
  2. Perform Lock-Out/Tag-Out procedures.
  3. Remove cabinet power.
  4. Wait at least five minutes before handling electronic modules.
  5. Wear an ESD wrist strap.

Required Tools

  • Phillips screwdriver
  • Digital multimeter
  • ESD wrist strap
  • Wire identification labels
  • Smartphone for wiring documentation

Before Removal

  • Backup controller configuration.
  • Record AF100 network parameters.
  • Photograph all communication wiring.
  • Verify firmware revision and module part number.

 

Stage 2 – Removing the Existing Module (5 Minutes)

  1. Disconnect cabinet power.
  2. Remove AF100 communication cables.
  3. Disconnect the ModuleBus connection.
  4. Release the retaining latch.
  5. Remove the CI820V1 without twisting the connector.

⚠️ Keep the original module until the replacement has completed functional testing.

 

Stage 3 – Installing the New Module (10 Minutes)

  1. Verify the replacement part number is 3BSE025255R1.
  2. Install the module into the S800 communication slot.
  3. Reconnect AF100 communication wiring.
  4. Verify ModuleBus connectors are fully seated.
  5. For redundant systems, install and configure the second CI820V1.

Installation Checklist

  • ✔ Correct model installed
  • ✔ Both redundant FCIs installed (if redundancy is required)
  • ✔ AF100 wiring verified
  • ✔ ModuleBus connection secure
  • ✔ Configuration restored

 

Stage 4 – Power-On & Commissioning (10 Minutes)

  1. Restore cabinet power.
  2. Verify normal module LED status.
  3. Confirm AF100 communication.
  4. Verify redundant communication status.
  5. Test controller-to-I/O communication.
  6. Review diagnostic logs before returning the process to service.

⚠️ Field Tip: One of the most common startup problems is installing only a single CI820V1 in a system configured for redundancy. ABB documentation explicitly requires two CI820V1 modules for redundant operation.

CI820V1 3BSE025255R1
CI820V1 3BSE025255R1
CI820V1 3BSE025255R1
CI820V1 3BSE025255R1

 

Frequently Asked Questions

1. What is the CI820V1 used for?

The CI820V1 is a Redundant Field Communication Interface (FCI) that connects ABB S800 I/O stations to the Advant Fieldbus 100 (AF100) network in System 800xA and Advant OCS installations.

2. Does one CI820V1 provide redundancy?

No. ABB specifies that two CI820V1 modules must be ordered and installed to implement redundant AF100 communication. A single module functions only as one side of the redundant pair.

3. Is the CI820V1 still available?

Yes, but it is considered a lifecycle spare part. Most units on the market are new surplus inventory, exchange units, or professionally tested refurbished modules.

4. Can the CI820V1 be hot-swapped?

No. ABB does not recommend replacing the communication interface while the system is energized. Always isolate power before removing or installing the module to prevent communication faults and possible hardware damage.

5. What usually causes communication failures after replacement?

Typical causes include:

  • Incorrect AF100 network configuration
  • Only one redundant module installed
  • ModuleBus connection not fully seated
  • Incorrect network addressing
  • Firmware or system software mismatch

6. Which ABB systems support the CI820V1?

The CI820V1 is supported in ABB S800 I/O, System 800xA, Advant OCS, and AC460 control system architectures that use the Advant Fieldbus 100 (AF100) communication network.

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