Product Core Brief
- Model: DI650
- Full OEM Part Code: 3BHT300025R1
- Brand: ABB
- Series: S100 I/O Subrack Hardware for Advant Master AC410 / AC450 Legacy DCS
- Core Function: Collect field 24VDC discrete contact signals (breaker position, protection trip, valve limit, interlock feedback); adopt 4 groups group-to-group isolation design to eliminate ground loop interference in power/chemical plant secondary circuits.
- Product Type: Single-slot plug-in I/O board for S100 vertical subrack backplane
- Key Specs: Total 32 DI channels, divided into 4 independent groups ×8 channels; 24VDC field signal; group galvanic isolation; backplane-powered; ⚠️ EOL discontinued, only surplus stock available
Product Introduction
ABB (3BHT300025R1) is a high-density digital input card exclusively for ABB Advant AC410/AC450 DCS S100 I/O subracks, widely deployed in old thermal power, hydropower, petrochemical plant control systems.It integrates 32 digital input channels, partitioned into 4 isolated groups of 8 channels each. Each group has independent isolation circuits, effectively suppressing common-mode noise and ground potential difference interference between multi-point field equipment, avoiding false triggering of switch signals.Compared with low-density 16-channel DI cards of the same S100 series, greatly reduces the number of I/O slots occupied in the cabinet, suitable for scenarios with massive breaker status and protection contact collection. The module receives power entirely from the rack internal backplane, no separate auxiliary power wiring required.It transmits all 32-channel switch status to Advant main controller via ModuleBus backplane, supports software-configurable input filter delay to filter contact jitter caused by field mechanical switch bouncing.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Full Part Number | 3BHT300025R1 ( 32CH Digital Input) |
| Compatible Controller | Advant AC410, AC450 Master DCS CPU |
| Matching Rack | vertical I/O subrack backplane |
| Channel Configuration | 32 DI, split into 4 isolated groups × 8 channels |
| Rated Field Signal Voltage | 24 V DC (operating range 18–30 V DC) |
| Isolation Standard | Group-to-group galvanic isolation, 500 V AC 1 minute withstand |
| Input Filter Delay | Software adjustable 1–100 ms for anti-bounce filtering |
| Backplane Supply | 24 V DC from rack backplane, reverse polarity protection |
| Typical Operating Current | 480 mA with all 32 channels energized |
| Max Power Dissipation | 5.8 W full load |
| Front Panel Indicators | Global RUN/FAULT LED + group status indicator LEDs |
| PCB Coating Grade | ISA-S71.04 G3 anti-corrosion conformal coating |
| Operating Ambient Temp | -25 ℃ ~ +55 ℃ continuous full load; derate 15% above 50℃ |
| Storage Temperature Range | -40 ℃ ~ +70 ℃, 5–95% RH non-condensing |
| Form Factor | Standard single-slot plug-in board |
| Overall Dimensions | W108 mm × H18 mm × D234 mm |
| Net Unit Weight | 1.225 kg |
| Safety Certifications | CE EMC, cULus Class I Div 2 hazardous location certified |
Quality Control Process
- Incoming Verification: Cross-check serial number and full code 3BHT300025R1 against ABB Advant legacy spare database; inspect backplane edge connector pins for bending, PCB solder joints free of cold soldering and oxidation. Reject modules with damaged anti-static packaging.
- 24h Full Load Aging Test: Insert into test subrack paired with AC450 CPU and 24VDC signal simulator, cycle all 32 channels ON/OFF continuously. Verify group isolation performance, adjustable filter delay function, record backplane voltage every 15 minutes.
- Insulation Withstand Test: 500V Megger insulation test between every two isolated groups, pass threshold ≥10MΩ; test backplane reverse polarity protection circuit function.
- Firmware Calibration: Read onboard I/O acquisition firmware version via Advant Builder engineering software, calibrate channel input threshold voltage.
- Final Packaging: Cover backplane edge connector with plastic dust cap; pack module with anti-static foam, attach dated QC Pass label before factory carton shipment.
Replacement Pitfall Guide
❗Model Compatibility Risk: only matches Advant rack system, cannot be mixed with Symphony Plus SD I/O DI01 or AC500 PLC S500 DI modules; mechanical size and backplane bus protocol are completely incompatible.❗Isolation Group Wiring Misjudgment: Signals of different voltage potential must be divided into different isolation groups; wiring cross-group will lose isolation effect and cause frequent signal misjudgment.❗Filter Delay Parameter Mismatch: Mechanical breaker contacts need to set ≥20ms filter delay; too small a value leads to bounce false signals during switch action.❗Backplane Overload Calculation: Calculate total rack 24V DC load with 20% power margin; multiple densely arranged will cause backplane voltage drop and intermittent channel loss.❗ESD Damage Acquisition Chip: Wear grounded anti-static wristband and touch cabinet earth bar for 3 seconds before disassembly/replacement; static discharge will damage group isolation optocoupler and digital acquisition logic chip.
Compatibility Matrix & Benchmarks
Compatibility Matrix
- -XC extended coating variant ↔ 3BHT300025R1: Direct plug-and-play replacement; XC version adds thick salt-fog resistant coating for coastal power plants.
- Advant AC410 / AC450 DCS main controller: Native ModuleBus communication, no additional conversion board required.
- CS513 10BASE2 LAN communication card: Coexists in the same Advant controller rack, unified Advant Builder software configuration.
- CSA464AE 8-channel analog output module: Same rack backplane mechanical fit, mixed digital/analog I/O layout supported.
- Symphony Plus DI01 SOE digital input module: Incompatible, different rack bus architecture, no group isolation design.
Performance Benchmarks
- Full 32-channel synchronous scan cycle: ≤ 3.5 ms
- Channel switch state upload latency: < 1.2 ms
- Group isolation insulation resistance: ≥ 1000 MΩ under 500V test voltage
- Contact bounce filter adjustment range: 1ms ~ 100ms software full-range configurable
