ABB CI627 – 3BSE008799R1 Communication Interface Module for ABB S800/AC 800M Systems

The ABB CI627 (part number 3BSE008799R1) is a communication interface module commonly used in ABB S800 I/O and AC 800M-based architectures to expand field connectivity and bridge controllers with third‑party devices or remote I/O. From my experience, it’s selected when you need reliable, industrial‑grade comms in brownfield upgrades or when you’re standardizing on S800 I/O form factors. It seems to be a practical drop‑in when you want to extend an existing ModuleBus segment without reworking cabinet layouts.

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Key Features

• ABB S800/AC 800M ecosystem fit – Designed for cabinets already using S800 I/O terminal bases, so panel upgrades are typically straightforward.
• Industrial‑grade isolation – Galvanic isolation between field side and ModuleBus helps reduce noise coupling and protects upstream equipment.
• Backplane-powered – Draws 24 V DC from the ModuleBus terminal base; no extra PSU rails in most cases.
• Compact footprint – S800 I/O module form factor keeps cabinet density high and cable runs clean.
• Service-friendly – Status LEDs and front access make diagnostics quicker during startup and maintenance.
• Lifecycle continuity – Suitable as a like‑for‑like replacement to minimize downtime during spares swaps.

Technical Specifications

Brand / Model	ABB CI627 — 3BSE008799R1
HS Code	8537.10 (Industrial control equipment; programmable controller assemblies)
Power Requirements	24 V DC supplied via ModuleBus (typical module consumption is low; sizing by cabinet rail is generally sufficient)
Dimensions & Weight	Approx. 119 × 45 × 104 mm; ~0.2–0.3 kg (S800 I/O form factor)
Operating Temperature	0 to +55 °C (storage typically −40 to +70 °C)
Signal I/O Types	Communication interface (no analog/digital field I/O). Provides network connectivity depending on system configuration.
Communication Interfaces	ModuleBus (backplane) to S800 I/O; field‑side protocol per CI627 variant and application design
Installation Method	Mounts on ABB S800 I/O terminal base (TU8xx series) on 35 mm DIN rail; front-access connectors and status LEDs

Application Fields

You might notice that CI-series modules tend to show up where legacy and modern systems meet. Typical deployments include:

• Oil & Gas and Petrochemicals – linking controllers to package skids, analyzers, and drives in hazardous‑area compliant cabinets.
• Power Generation & Utilities – extending communication to remote I/O islands in turbine or balance‑of‑plant systems.
• Water & Wastewater – serial/fieldbus integration for blowers, VSDs, and OEM panels without replacing entire PLC racks.
• Metals, Pulp & Paper, Marine – cabinet‑space‑constrained retrofits where S800 I/O density is a real advantage.

A maintenance lead at a wastewater site told me they chose CI627 mainly because it “drops into the existing S800 rail, no gymnastics,” and the isolation helped quiet down some stubborn EMC issues around VFD banks.

Advantages & Value

• Reliability – Industrial temperature ratings, isolation, and ABB’s proven S800 mechanics reduce nuisance faults.
• Compatibility – Works within ABB S800/AC 800M architectures; typically reuses TU8xx bases and existing cabinet power rails.
• Cost Control – Keeps panel redesign to a minimum; faster site commissioning compared to new platform migrations.
• Supportability – Documented behavior in ABB libraries and tools; firmware and diagnostics are well understood in the installed base.

Installation & Maintenance

• Cabinet & Mounting – Install on TU8xx terminal bases (e.g., TU810/TU812/TU830) on 35 mm DIN rail. Provide at least 50 mm frontal space for wiring and LED visibility.
• Power & Grounding – Ensure stable 24 V DC rail on the ModuleBus. Bond cabinet PE to a low‑impedance earth. Keep shield drains terminated to a common reference point.
• Wiring – Separate signal and power wiring. For serial/fieldbus lines, use twisted pair, observe maximum segment lengths, and maintain proper termination where applicable.
• Environmental – Operate within 0…+55 °C. Avoid condensation; provide cabinet ventilation if ambient exceeds mid‑40s °C.
• Addressing & Firmware – Set node addressing according to the project standard. Keep firmware in step with the controller toolchain; back up configuration prior to swap.
• Routine Maintenance – Quarterly visual inspection for connector looseness and oxidation; clean dust with dry air; verify LED diagnostics; review network error counters in the control system.

Quality & Certifications

• CE compliant; typically UL Listed for industrial control equipment
• RoHS compliant materials, per ABB’s environmental program
• Manufactured under ISO 9001 quality system
• Warranty: 365 days

Commonly Paired Components

For planning a complete drop‑in, these parts are typically seen alongside CI627 in the same cabinets:

• ABB TU8xx terminal bases (e.g., TU810, TU812, TU830) for S800 modules
• AC 800M controllers (e.g., PM864/PM865 series) when used in central control applications
• S800 I/O modules (DI/DO/AI/AO series) that share the same ModuleBus and mechanics
• Shielded twisted-pair cables and proper termination kits for the target field protocol

One thing I appreciate is how predictable the installation is when you standardize on S800 mechanics—usually no surprise gaps in the panel, and the ModuleBus power budget stays under control.