ABB AI625 3BHT300036R1 Analog Input Module | Replacement, Equivalent & Selection Guide
The ABB AI625 (Part No. 3BHT300036R1) is a high-precision analog input module designed for ABB’s AC500 PLC platform. It acquires and converts analog field signals — current and voltage — into digital values for real-time process control. As a core I/O component in ABB’s modular automation architecture, the AI625 is widely deployed in power generation, water treatment, chemical processing, and discrete manufacturing environments.
Selection Background
Industrial buyers frequently search for AI625 replacement, 3BHT300036R1 equivalent, or AI625 substitute when facing end-of-life notices, extended lead times, or budget constraints. Understanding which alternatives are functionally compatible — and under what conditions — is critical to maintaining system integrity. This guide consolidates that information to support informed procurement decisions. Whether you need a direct drop-in replacement or a cross-brand equivalent, Konmask’s engineering team can assist with validation before purchase.
Technical Specifications
- Part Number: AI625 / 3BHT300036R1
- Platform: ABB AC500 PLC
- Module Type: Analog Input
- Number of Channels: 8 channels (configurable per channel)
- Input Signal Types: 0–10 V, ±10 V, 0–20 mA, 4–20 mA ⚑ (key for replacement compatibility)
- Resolution: 16-bit
- Conversion Time: ≤ 1 ms per channel
- Isolation: Channel-to-channel and channel-to-bus isolation
- Communication Bus: AC500 internal I/O bus
- Supply Voltage: 24 V DC (via CPU or expansion bus)
- Operating Temperature: −25 °C to +60 °C
- Protection Rating: IP20
- Certifications: CE, UL, cUL, ATEX (zone 2 with appropriate housing)
- Weight: 1,560 g (module + packaging)
- Dimensions: Standard AC500 I/O module form factor
⚑ Signal range and resolution are the two parameters most critical to evaluating any replacement or equivalent module.
Compatible Replacement & Equivalent Models
Category 1 — Direct Drop-in Replacements
These modules share the same form factor, bus interface, and firmware compatibility with the AI625 and can be swapped without hardware or software modification:
- ABB AI625-XC (3BHT300036R2) — Extended temperature variant; functionally identical, suitable for harsh environments
- ABB AI625 (earlier firmware revisions) — Confirm firmware version compatibility with your CPU firmware level before installation
Category 2 — Functional Equivalents
These modules offer equivalent I/O functionality within the ABB AC500 ecosystem but may require configuration changes or minor wiring adjustments:
- ABB AI523 (1SAP250200R0001) — 8-channel analog input, compatible with AC500 V2/V3 CPUs; verify channel configuration mapping in Automation Builder
- ABB AI531 (1SAP250400R0001) — 8-channel AI with HART support; suitable if HART communication is required in the replacement scenario
Category 3 — Cross-Brand Alternatives
For applications where ABB platform continuity is not mandatory, the following cross-brand modules offer comparable analog input performance. Note: cross-brand substitution requires full system re-engineering and is not a plug-and-play replacement.
- Siemens 6ES7331-7KF02-0AB0 (S7-300 SM331) — 8-channel AI, 13-bit resolution; suitable for Siemens-based migration projects
- Schneider Electric BMXAMI0810 — 8-channel AI for Modicon M340; requires Modbus or EtherNet/IP gateway if integrating with existing ABB network
- Rockwell 1756-IF8 (ControlLogix) — 8-channel differential AI; high-accuracy alternative for ControlLogix migration
Why Choose the Original Model
- Measurement Precision: 16-bit resolution ensures ±0.1% full-scale accuracy, critical for PID loop control and process analytics
- Certified Compliance: CE, UL, cUL, and ATEX certifications eliminate re-qualification costs in regulated industries
- Seamless Bus Compatibility: Native AC500 I/O bus integration guarantees zero configuration overhead and full diagnostic transparency in Automation Builder
- ABB Technical Support: Access to ABB’s global service network, firmware updates, and lifecycle management documentation
- Warranty Coverage: Full OEM warranty with traceable serial numbers — essential for audit trails in ISO-certified facilities
- Long-Term Availability: ABB’s published product lifecycle roadmap supports multi-year spare parts planning and MTBF-based maintenance scheduling
Typical Applications
- Power Generation: Turbine governor control — monitoring steam pressure and temperature via 4–20 mA transmitters
- Water & Wastewater: Flow and level measurement in pump stations using submersible pressure transducers
- Chemical Processing: Multi-point temperature acquisition in reactor vessels with thermocouple signal conditioning
- Oil & Gas: Pipeline pressure monitoring in SCADA-integrated remote terminal units
- Pulp & Paper: Tension and speed control loops on winding machines requiring high-resolution analog feedback
- Building Automation: HVAC system integration — CO₂, humidity, and differential pressure sensor acquisition
System Compatibility
The AI625 is designed for use within the ABB AC500 ecosystem. Verified compatible components include:
- PM573-ETH (1SAP130300R0271) — AC500 V2 CPU with Ethernet; primary host processor
- PM591-2ETH (1SAP140100R0271) — AC500 V3 CPU; supports AI625 with firmware ≥ V3.4
- TB521-ETH (1SAP212100R0001) — Terminal base for AI625 module mounting and field wiring
- DC532 (1SAP240600R0001) — Digital output module; commonly paired in mixed I/O racks
- CI590-CS31-HA (1SAP222000R0001) — CS31 bus coupler for distributed I/O expansion
- PS501 Automation Builder — Engineering software for module configuration, diagnostics, and firmware management
Selection Guide
Before ordering, confirm the following three criteria to ensure the AI625 or its equivalent is the right fit for your application:
- Signal Type Match: Does your field instrument output 0–10 V, ±10 V, 0–20 mA, or 4–20 mA? The AI625 supports all four — confirm your transmitter output range matches one of these before selecting a cross-brand substitute.
- CPU Firmware Compatibility: What is the firmware version of your AC500 CPU? AI625 requires Automation Builder ≥ V2.3. If you are running an older CPU, contact Konmask to verify compatibility before purchase.
- Channel Count & Isolation Requirements: Do you need channel-to-channel isolation? The AI625 provides full isolation — some lower-cost equivalents do not. Confirm your application’s isolation requirements before substituting.
Not sure which model fits your system? Contact Konmask at support@konmask.com — our engineers will review your BOM and recommend the correct module within 24 hours.
Quality Assurance & Sourcing
Konmask sources the ABB AI625 3BHT300036R1 exclusively through authorized ABB distributors, certified secondary market channels, and factory-sealed surplus inventory. Every unit undergoes a 4-step inspection process before shipment:
- Visual Inspection: Housing integrity, label authenticity, connector condition, and absence of rework or counterfeit indicators
- Serial Number Verification: Cross-referenced against ABB’s production database where accessible
- Functional Bench Test: Power-on self-test and channel-level signal verification using calibrated test equipment
- Documentation Review: Matching of firmware version, date code, and country of origin against declared specifications
Available documentation upon request: Certificate of Conformance (CoC), test reports, packing list with serial numbers, and commercial invoice.
How to Order
- Submit Your Inquiry: Email support@konmask.com with your required part number (AI625 / 3BHT300036R1), quantity, and delivery timeline — or use the contact form on Konmask.com
- Receive Quotation: Konmask will respond within 24 hours with pricing, lead time, and available stock confirmation
- Confirm & Ship: Upon order confirmation, modules are inspected, packed, and dispatched with full documentation — DHL, FedEx, or sea freight available
Replacement & Compatibility FAQ
Q: Can I use the ABB AI523 as a direct replacement for the AI625?
A: The AI523 is a functional equivalent within the AC500 platform but is not a direct drop-in replacement. It requires reconfiguration in Automation Builder and may have different terminal base requirements. Konmask recommends engineering review before substitution.
Q: Is the AI625 compatible with both AC500 V2 and V3 CPUs?
A: Yes. The AI625 is compatible with AC500 V2 CPUs (PM573 series) and AC500 V3 CPUs (PM591 series) running firmware ≥ V3.4. Always verify your CPU firmware version before installing a replacement module.
Q: What is the best cross-brand substitute for the AI625 if I am migrating away from ABB?
A: The best equivalent depends on your target platform. For Siemens S7-300 migrations, the SM331 (6ES7331-7KF02-0AB0) is a widely used substitute. For Schneider Modicon M340, the BMXAMI0810 is comparable. Note that cross-brand substitution is not plug-and-play — full re-engineering is required. Contact Konmask for migration support.
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