Product Core Brief

• Model: CI810B, OEM Article Code 3BSE020520R1
• Brand: ABB Control Systems
• Series: S800 Distributed I/O for AC800M / System 800xA DCS
• Core Function: AF100 Fieldbus Communication Interface (FCI); dual integrated AF100 twisted-pair modems connect S800 ModuleBus I/O racks to AC800M controllers via AF100 backbone, supports single/dual redundant bus media, OSP fail-safe, HCIR online I/O reconfiguration and full channel diagnostics.
• Product Type: DIN rail-mounted S800 rack AF100 communication gateway module
• Key Specs: Dual independent AF100 ports | Built-in ModuleBus master | Redundant bus support | 500 VAC group dielectric isolationNote: Active OEM spare, new original surplus stock available; non hot-swap rated, ships with TB807 ModuleBus terminator, dual AF100 terminal connectors and power plug accessory kit.

Key Technical Specifications

• Operating supply: 24 V DC ±10 %, typical draw 130 mA, feeds up to 8 S800 I/O card slots via ModuleBus
• Backbone protocol: (Advant Fieldbus 100), proprietary twisted-pair industrial DCS backbone bus
• Dual channels: Two isolated twisted-pair modem circuits, independent media paths for full cable redundancy
• Max segment length: Up to 15,000 m for long-distance plant-wide DCS backbone layout
• Internal ModuleBus: Daisy-chains maximum 8 S800 I/O slots per CI810B station
• Galvanic isolation: 500 VAC 1-minute dielectric separation between field backbone and internal ModuleBus logic
• Core supported functions:
  1. HCIR (Hot Configuration In Run): Add/replace I/O modules online without DCS full stop
  2. OSP (Output Safe Position): Predefined analog/digital fail-safe state upon bus loss
  3. Full aggregated per-channel diagnostics: Wire-break, short-circuit, supply under-voltage alarms
  4. Dual media redundancy: Automatic failover to secondary line on primary cable fault
• PCB coating: ISA-S71.04 G3 industrial conformal coating for mild corrosive power & chemical plant cabinets
• Status indicators: Multi-color front LEDs for PWR, ModuleBus RUN, CH1/CH2 BUS FAULT, HCIR warning
• Mechanical form: Standard 35 mm DIN rail snap-in unit, IP20 enclosure rating
• Operating ambient: 0 °C to +55 °C continuous duty; compact MTU racks limited to 0–40 °C
• Storage range: -40 °C to +70 °C, non-condensing 5–95 % relative humidity
• Hazardous certifications: ATEX II 3G Ex nA IIC T4 Gc Zone 2, cULus Class I Div 2 Groups A-D
• Physical dimensions: 158 mm W × 250 mm H × 60 mm D
• Net weight: 0.50 kg

Product Introduction

This gateway FCI module is the core long-distance communication hardware for S800 I/O racks deployed across large-scale 800xA DCS sites. It acts as an slave to the AC800M CPU’s master port and operates as local master for the internal ModuleBus to scan all analog/digital I/O cards in its rack cluster.Dual redundant modem circuits eliminate single-point cable failure risk for critical safety loops; galvanic isolation suppresses ground-loop noise from remote field cabinets and variable frequency drives, preventing intermittent I/O value freezing on multi-kilometer backbone runs. Native HCIR functionality avoids full process shutdown during I/O rack expansion, while unified diagnostic aggregation centralizes all channel fault data to the DCS HMI.

QA & Testing SOP

1. Incoming Inspection: Cross-reference serial numbers and 3BSE part code against ABB spare part databases. Inspect dual terminal connector pin integrity, TB807 terminator matching, full LED bank functionality and intact factory anti-static packaging to filter counterfeit stock.
2. Live Testing: Mount the module on DIN rail test rack paired with AC800M PM865 master simulator. Run continuous 24-hour cyclic I/O scan testing across mixed AI/AO/DI/DO module sets while logging stable 24VDC supply with a Fluke 115 multimeter. Simulate primary trunk disconnection, ModuleBus short-circuit and HCIR module hot-add to validate automatic redundant bus failover, OSP fail-safe state and diagnostic flag timing.
3. Electrical Testing: Use a 500V Megger to measure insulation resistance between field backbone circuit and internal ModuleBus logic; pass threshold set at ≥10 MΩ. Inject 50Hz differential ground-loop noise to confirm no random I/O communication loss or bus switchover jitter.
4. Firmware/Config Backup: Record factory default station address and ModuleBus scan parameters via Control Builder M engineering software. Capture high-resolution photos of dual terminal pinout and ModuleBus termination layout for field commissioning reference.
5. Final QC & Packaging: Fit plastic dust caps over both front terminal ports, bundle TB807 terminator and power plug accessories. Place the module inside foam-lined anti-static shielding bag, affix a dated QC pass label before sealing in original factory carton.

Installation Pitfalls & Guide

❗Firmware Rev Mismatch Risk: AC800M controller firmware older than v5.2.2 lacks register mapping for dual redundant media failover and HCIR logic. Post-replacement, the DCS will not switch to secondary bus line on primary fault and throw intermittent COMM LOSS alarms. Remediation: Flash matching firmware revision to the AC800M CPU before DIN rail mounting.❗Non Hot-Swap Hardware Warning: CI810B carries no official ABB hot-swap certification. Removing/inserting while 24 V auxiliary power remains live generates destructive voltage transients that crash the entire rack ModuleBus and corrupt controller process image tables. Full rack lockout/tagout of 24 V supply is mandatory for replacement.❗ModuleBus Termination Error Risk: TB807 terminator must only be fitted to the last I/O card slot on the ModuleBus daisy chain. Missing or duplicate termination creates signal reflection, persistent scan jitter and random channel fault flags.❗Redundant Cabling Misconfiguration Risk: Dual lines must run separate physical cable routes to achieve true fault tolerance; routing both trunks in the same cable tray negates redundancy protection during tray cable damage events.❗ESD Dangers: Ungrounded handling exposes differential transceiver and ModuleBus logic traces to static discharge from dry control room air. Field records show unprotected handling burns backbone communication circuits; full boiler/turbine unit downtime labor cost exceeds $1,680. Remediation: Place anti-static mat under the DIN rail rack, wear grounded wrist strap, touch bare cabinet chassis ground for 3 seconds before handling the module.

4-step replacement guide

1. Pre-install: Execute full lockout/tagout of rack 24 V auxiliary power. Photograph dual trunk wiring routes, ModuleBus daisy-chain layout and CI810B station address configured in Control Builder M; set all safety-critical modulating valves to manual bypass position.
2. Removal: Depress DIN rail retention latch, slide the old module upward off the rail, disconnect both trunk terminal blocks, 24 V power terminal block and ModuleBus ribbon cable, store unit in static-safe sleeve.
3. Install: Mount new CI810B onto DIN rail, re-seat power connector, ModuleBus ribbon and dual trunk cables, install TB807 terminator on final I/O slot of the ModuleBus chain.
4. Power-on Test: Restore 24 V auxiliary power first; verify front CH1/CH2 RUN LEDs illuminate steady green, perform full slave scan to confirm all I/O channels communicate correctly, test primary bus cable disconnection to validate automatic redundant failover before enabling automatic closed-loop DCS control.

FAQ

Q: Can this FCI module be hot-swapped while the rack remains powered?A: No. CI810B carries no ABB hot-swap certification. Live extraction generates voltage transients that take the entire ModuleBus offline and can permanently damage downstream I/O module communication circuits. Complete 24 V auxiliary power isolation is required for replacement.Q: Does this communication module carry original OEM factory warranty when purchased as new surplus?A: ABB factory warranty follows standard component lifecycle coverage. All surplus inventory passes full in-house bench QA testing and carries a 12-month internal stock replacement warranty, limited to manufacturing defects detected during validation testing.Q: Can CI801 serve as a direct drop-in replacement for the unit?A: DIN rail mechanical fit only. CI801 uses single Profibus DP interface without redundant dual backbone ports; swapping CI801 requires full plant backbone cabling rework and DCS bus architecture reconfiguration.Q: What minimum CPU firmware version enables full dual redundant failover and HCIR support?A: controller firmware v5.2.2 or newer. Older firmware omits redundant bus switchover register mapping and cannot execute online HCIR I/O modification without process pause.Q: Will station address and ModuleBus scan configuration persist after module replacement?A: All bus configuration data resides in the CPU non-volatile memory; no local parameter storage on hardware. No full reconfiguration is required post-swap, only a complete slave scan verification and redundancy failover test.Q: Is the unit compatible with legacy Advant AC450 / MasterPiece DCS racks?A: No. uses ModuleBus + proprietary backbone architecture exclusive to / 800xA; zero electrical and mechanical compatibility with Advant CEX bus CI54x series communication hardware.Q: Can multiple racks be daisy-chained off one ModuleBus port?A: Maximum 8 I/O card slots per single ModuleBus segment. Larger I/O clusters require separate modules assigned distinct slave addresses.