Description
Product Overview
The ABB CI820V1 3BSE025255R1 is a redundant Fieldbus Communication Interface designed for ABB’s S800 I/O system. It provides the communication interface between compatible control-system equipment and distributed I/O over the Advant Fieldbus 100 (AF100) network. ABB’s product catalog identifies the CI820V1 as an S800 redundant FCI and lists an AF100 modem, 0.5 MB of flash PROM, 0.5 MB SRAM, and a 16 MHz processor. The module is associated with legacy Advant OCS and supported System 800xA configurations.
In a distributed control system, the FCI is a key communication component: it carries data between the control system and the connected I/O station. A fault in this path can affect I/O visibility and control availability, so replacement requires more than matching the model number. ABB’s catalog states that two CI820 modules must be ordered for redundancy and identifies the TB815 interconnection unit for connecting two CI820 modules. It also lists an A070 item as required for the CI820V1 configuration. These requirements should be checked against the specific system drawing and bill of materials before procurement.
When sourcing the ABB CI820V1 3BSE025255R1, verify the complete order number, hardware condition, installed firmware or system-software requirements, and compatibility with the existing AF100 network. Do not assume that specifications advertised for other ABB communication interfaces—such as CI810B or CI840A—apply to this module. For critical process installations, request photographs of the actual unit and evidence of inspection or functional testing. After replacement, confirm communication health and I/O data exchange using the site’s established commissioning procedure.
Product Introduction
The CI820V1 is intended for installations that use ABB’s S800 I/O architecture and AF100 fieldbus communications. Its redundant role makes it relevant to plants that need to maintain communication availability between control equipment and remote I/O. However, redundancy is a system-level arrangement: installing a single CI820V1 does not, by itself, establish a redundant communication path.
Before replacing the module, check the companion FCI, interconnection hardware, required accessories, fieldbus cabling, and software compatibility. Record existing status indicators and system diagnostics before removing the original unit. After installation, confirm that the expected I/O modules are visible, fieldbus communication is healthy, and the redundant arrangement behaves as intended.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model | CI820V1 3BSE025255R1 |
| Part number | 3BSE025255R1 |
| Product type | S800 redundant Fieldbus Communication Interface (FCI) |
| System family | ABB S800 I/O |
| Primary communication protocol | Advant Fieldbus 100 (AF100) |
| AF100 modem | 1, per ABB catalog |
| Processor frequency | 16 MHz, per ABB catalog |
| Flash PROM | 0.5 MB, per ABB catalog |
| SRAM | 0.5 MB, per ABB catalog |
| Redundancy arrangement | Two CI820 modules required for the documented redundant configuration |
| Interconnection unit | TB815 is listed for interconnecting two CI820 modules |
| Additional required item | A070, as listed in ABB’s product catalog; confirm exact configuration |
| Power supply | Verify from the applicable ABB technical documentation and installed hardware |
| Communication speed | Supplier listings report 1,500 kbit/s; confirm against the applicable documentation |
| Electrical isolation | Not verified from the primary catalog information reviewed |
| Supported control systems | Advant OCS and specified System 800xA / S800 I/O configurations |
| Mounting method | Confirm the mounting base and installed cabinet arrangement |
| Operating temperature | Not verified from the primary catalog information reviewed |
| Protection rating | Not verified from the primary catalog information reviewed |
| Product net weight | Approximately 0.6 kg, according to supplier catalog records |
Specification note: Third-party listings provide additional voltage, temperature, isolation, and interface figures, but these are not consistently corroborated by the ABB catalog entries reviewed. Confirm those values from the applicable hardware manual before using them for design or commissioning.
CI820V1 3BSE025255R1
Related Products
- ABB TB815 — 3BSE013204R1: Interconnection unit listed for connecting two CI820 modules.
- ABB CI810B — 3BSE020520R1: field communication interface with two twisted-pair connections; a different model and not an automatic replacement.
- ABB CI840A — 3BSE041882R1: PROFIBUS DP-V1 communication interface for a different communication architecture.
- ABB I/O system accessories: Verify the required connectors, termination components, and any configuration-specific items against the installed station documentation.
Frequently Asked Questions
Q1: What is the ABB 3BSE025255R1?
It is an ABB I/O redundant Fieldbus Communication Interface used with the Advant Fieldbus 100 network.
Q2: Does the support redundant operation?
Yes. ABB’s catalog specifies that two CI820 modules must be ordered for the documented redundant arrangement. The associated interconnection hardware and system configuration must also be correct.
Q3: What protocol does the use?
Its documented fieldbus is Advant Fieldbus 100 (). Do not assume it directly supports PROFIBUS DP or other protocols associated with different ABB communication modules.
Q4: Is TB815 required?
ABB’s catalog identifies TB815 as the interconnection unit used to connect two modules. Check the installed configuration and bill of materials to confirm the required accessory arrangement.
Q5: Can CI810B or CI840A replace ?
Not as a direct substitution based on model similarity. These modules use different communication interfaces or configurations. Any substitution requires confirmation against the system architecture and applicable ABB documentation.
Q6: What should I check when purchasing a replacement?
Confirm the complete part number, physical condition, connector integrity, software compatibility, and whether the required accessories are included. Request actual-unit photographs and inspection or functional-test records.
Q7: How should the replacement be commissioned?
Follow the site’s approved maintenance procedure. Check the FCI’s status indicators, confirm fieldbus communication, verify that expected I/O modules are visible, and test the redundant path if redundancy is installed.
Procurement Recommendation
The ABB 3BSE025255R1 should be purchased against the exact installed / configuration. Confirm whether the requirement is for a single spare or a complete redundant arrangement, including the second FCI, TB815 interconnection unit, and the catalog-listed A070 item where applicable. Require clear identification and documented testing from the supplier, then validate fieldbus and I/O communication after installation.
