Product Core Brief
- Model: CI854 (CI854A)
- Full OEM Part Code: 3BSE025347R1
- Brand: ABB
- Series: AC 800M / System 800xA PROFIBUS DP communication interface family
- Core Function: Dual-port PROFIBUS DP-V1 master communication module, bridges AC800M controller CEX internal rack bus to PROFIBUS DP fieldbus; implements line redundancy via two independent DB9 PROFIBUS ports, supports module-level master redundancy for uninterrupted field device communication. Connects S800 remote I/O, MV drives, MCC, transmitters and third-party PROFIBUS instruments to DCS control logic.
- Product Type: DIN rail hot-swappable fieldbus communication module (supports CEX bus rack expansion, paired with TP854 baseplate)
- Key Specs: Dual independent DB9 PROFIBUS DP ports (line redundancy) | DP-V1 master, up to 12 Mbps baud rate | CEX bus compatible (max 12 comm modules per controller) | Module/CPU redundant architecture support | 24 VDC rack powered | Hot-swap certified ⚠️ EOL, replaced by CI854B; limited surplus stock remaining
Product Introduction
The ABB CI854 3BSE025347R1 (CI854A) is a classic redundant PROFIBUS master module for ABB System 800xA AC800M DCS, widely deployed in thermal power, chemical, oil & gas and water treatment plants. It delivers dual physical PROFIBUS bus paths to eliminate single cable failure risk; paired dual CI854A modules realize full master redundancy alongside redundant UFC760BE43/1142 AC800M CPUs.
This unit differs from single-port CI857 modules by dual DB9 PROFIBUS interfaces for line redundancy, and differs from newer CI854B by older PCB component layout (CI854B is drop-in compatible hardware replacement without logic rework). It exchanges real-time analog/discrete I/O data between AC800M CPU and PROFIBUS slave devices over the rack internal CEX backplane bus. OEM field logging records a 57,000 hour MTBF under steady 50 °C control cabinet runtime.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Compatible DCS Platform | ABB System 800xA AC 800M CPU racks (UFC760BE43 / UFC760BE1142); S800 I/O, ACS series drives, PROFIBUS DP-V1 slave devices |
| Official Part Number | 3BSE025347R1 (designation ) |
| Backplane Bus Interface | CEX bus (controller internal expansion bus; max 12 communication modules per CPU) |
| PROFIBUS Ports | 2 × isolated DB9 female PROFIBUS DP connectors (A/B line redundancy) |
| Supported Protocols | PROFIBUS DP-V0 cyclic I/O exchange, DP-V1 acyclic parameter access (DTM/FDT device diagnostics) |
| Baud Rate Range | 9.6 kbps ~ 12 Mbps user configurable |
| Redundancy Modes | 1) Line redundancy (dual bus cables via two ports); 2) Module master redundancy (dual paired with redundant CPU) |
| Operating Supply | 24 VDC ±20% rack backplane feed; typical 300 mA power draw |
| Hot Swap Compliance | AC800M certified hot-swap; CEX bus and opposite PROFIBUS line remain operational during module replacement |
| Onboard Diagnostics | PROFIBUS line break alarm, slave station loss, CEX bus communication fault, module redundancy status LED indicators |
| Mechanical Mount | DIN rail mount with TP854 dedicated baseplate; single-width compact housing |
| Mechanical Dimensions | W59 mm × H185 mm × D127.5 mm |
| Net Weight (module + base) | 700 g |
| Continuous Operating Ambient Temp | -20 °C ~ +60 °C full rated bus performance; linear derate above 60 °C |
| Storage Temperature Range | -40 °C ~ +85 °C, 5–95% RH non-condensing |
| Integrated Protection Circuits | PROFIBUS port ESD surge clamping, backplane reverse polarity lockout, short-circuit current limiting per bus channel |
| Certifications | UL, CE, RoHS, EN61000 Class A industrial EMC filtering for power generation & heavy industry cabinets |
Quality Control Process
- Incoming Verification: Cross-reference serial numbers against ABB System800xA OEM trace databases; inspect dual DB9 PROFIBUS connectors for pin bending, CEX gold edge connector for oxidation, front status LED banks for dead segments. Photograph CEX backplane pinout and PROFIBUS wiring mapping for cabinet commissioning reference.
- Live Functional Test: Mount module with TP854 baseplate into populated test rack paired with UFC760BE1142 dual-Ethernet CPU and simulated PROFIBUS DP slave devices; run continuous 24-hour cyclic I/O polling test, manually disconnect one PROFIBUS line to verify seamless redundant bus switchover without data loss. Log 24 V backplane supply stability with Fluke 115 multimeter for full test duration.
- Electrical Parameter Test: Perform 500 V Megger insulation resistance test between PROFIBUS field circuits and module chassis ground; pass threshold >10 MΩ. Verify dual-port automatic line switchover completes within <15 ms upon single cable disconnection.
- Firmware & Redundancy Verification: Read factory communication firmware revision via Control Builder M engineering software; document default PROFIBUS baud rate, station address range and redundancy logic register settings for site commissioning reference. Test dual-module master redundancy hot standby switchover timing.
- Final QC & Packaging: Wipe CEX gold edge connectors to remove oxidation; seal module inside anti-static foam sleeve, attach dated QC Pass label listing bus continuity, insulation, redundancy switchover and self-test metrics before shock-resistant carton shipping packaging.
Replacement Pitfall Guide
❗ Single-Port CI857 Variant Mismatch Risk: CI857 single-port PROFIBUS modules cannot substitute CI854 3BSE025347R1. CI857 lacks dual-port line redundancy hardware; replacement will remove fault-tolerant PROFIBUS bus protection and trigger continuous fieldbus loss alarms during single cable faults. Match full 3BSE025347R1 part number for redundant PROFIBUS rack slots only.❗ Partial CEX Rack Slot Insertion Risk: Uneven module seating creates high-resistance CEX backplane contact points that throttle PROFIBUS bus throughput and delay cyclic I/O data exchange during critical process pressure/temperature transients. Push module fully into DIN rail baseplate and lock front retention latches flush against rack faceplate.❗ PROFIBUS Cable Termination & Ground Misconfiguration Risk: Fail to install 120Ω termination resistors at bus two endpoints or dual-point shield grounding creates severe 50/60 Hz EMI hum, leading to intermittent slave dropouts. Use shielded PROFIBUS DP cable; terminate shield ground at only DCS cabinet terminal block single point, enable built-in termination on end station connectors.❗ ❗ Uncontrolled ESD Damage Risk: Dry central control room air builds static charge rapidly. Touch grounded anti-static mat for three full seconds before handling CEX gold edge connectors and DB9 PROFIBUS ports; ungrounded contact destroys low-tolerance fieldbus transceiver ASICs.Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
Compatibility Matrix
- CI857 single-port PROFIBUS DP module → 3BSE025347R1 : Needs Adaptation — full PROFIBUS topology redesign required to add redundant second bus cable and adjust DCS redundancy logic
- UFC760BE43 single-Ethernet CPU → : Direct — CEX bus backplane natively exchanges cyclic PROFIBUS I/O data between controller and communication module
- UFC760BE1142 dual-Ethernet CPU → : Direct — supports dual master redundancy paired with redundant CPUs
- ABB S800 PROFIBUS remote I/O unit → : Direct — module acts as DP master to scan all S800 DP slave stations
- VM310 24 V cabinet auxiliary power supply → : Direct — regulated 24 V output matches module ±20% operating voltage window without extra conditioning
- ABB UFC760BE42 AC800PEC power excitation CPU → : Needs Adaptation — add PROFIBUS-DP to fiber gateway to bridge generator excitation cabinet fieldbus data to System800xA DCS
- CML40.2-SP-330-NA-NNNN-NW Rexroth SERCOS motion PLC → : Needs Adaptation — wire module PROFIBUS bus fault dry contacts to PLC digital inputs, map process I/O registers via PROFIBUS DP slave gateway polling
