ABB PM861AK01 3BSE018129R1 Processor Module | Replacement, Equivalent & Selection Guide
The ABB PM861AK01 (Part No. 3BSE018129R1) is a high-performance processor module designed for the ABB AC 800M distributed control system (DCS) platform. As a core CPU unit, it handles real-time process control, communication management, and program execution for demanding industrial automation environments. This page provides a comprehensive selection guide, compatible replacement models, and sourcing information to help engineers and procurement teams make confident decisions.
Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | ABB |
| Model / SKU | PM861AK01 |
| Part Number | 3BSE018129R1 |
| Series | AC 800M |
| Module Type | Processor / CPU Module |
| Processor | 32-bit RISC |
| Program Memory | 8 MB Flash |
| Data Memory | 8 MB SRAM |
| Communication Ports | 2 × Ethernet (MMS/PROFIBUS), 1 × RS-232 |
| Supported Protocols | PROFIBUS DP, MMS, Modbus, OPC |
| Redundancy Support | Yes (Hot Standby) |
| Operating Temperature | 0 °C to +55 °C |
| Storage Temperature | -40 °C to +70 °C |
| Power Supply | 24 V DC (via backplane) |
| Dimensions (W×H×D) | Approx. 35 × 230 × 230 mm |
| Weight | Approx. 0.6 kg |
| Certifications | CE, UL, cUL, ATEX (Zone 2) |
| Country of Origin | Sweden / Germany |
Compatible Replacement & Equivalent Models
The following models are functionally compatible or serve as direct/near-direct replacements for the PM861AK01 within the ABB AC 800M ecosystem. Always verify firmware version and backplane compatibility before substitution.
| Model | Part Number | Key Difference | Compatibility |
|---|---|---|---|
| PM861AK01 | 3BSE018129R1 | Original model (this unit) | ✔ Direct match |
| PM864AK01 | 3BSE018161R1 | Enhanced memory, faster CPU | ✔ Drop-in upgrade |
| PM865AK01 | 3BSE031151R1 | Higher I/O capacity, dual Ethernet | ✔ Upgrade path |
| PM866AK01 | 3BSE050198R1 | Latest generation, extended lifecycle | ✔ Recommended upgrade |
| PM851AK01 | 3BSE018100R1 | Entry-level, reduced memory | ⚠ Downgrade — verify application |
Note: Third-party or aftermarket replacements are not recommended for safety-critical processes. Contact Konmask for OEM-sourced units.
Why Choose the Original PM861AK01
- Proven reliability — Deployed in thousands of process plants worldwide across oil & gas, power, and chemical industries.
- Native AC 800M integration — Seamless compatibility with ABB Control Builder M software and all AC 800M I/O modules.
- Hot-standby redundancy — Supports bumpless switchover for continuous process availability.
- Long service history — Extensive spare parts availability and documented field performance data.
- OEM firmware support — Eligible for ABB firmware updates and technical support contracts.
Typical Applications
- Oil & gas upstream/downstream process control
- Power generation and substation automation
- Chemical and petrochemical plant DCS
- Pulp & paper mill process control
- Water treatment and utilities automation
- Marine and offshore control systems
System Compatibility
- DCS Platform: ABB AC 800M (all variants)
- Software: ABB Control Builder M (CBM) v4.x – v6.x
- I/O Modules: S800 I/O, S900 I/O (via CI840/CI854 interface)
- Communication: CI854AK01 (PROFIBUS DP), CI857K01 (PROFINET), CI858K01 (DeviceNet)
- Power Supply: SD821, SD822, SD823 (ABB AC 800M PSU series)
- Backplane: TB840A, TB842A, TB843A
Selection Guide
Use the following criteria to determine whether the PM861AK01 is the right choice for your application, or whether an upgrade model is more appropriate:
| Requirement | Recommended Model |
|---|---|
| Direct replacement for existing PM861 installation | PM861AK01 (3BSE018129R1) |
| Need more memory / faster scan time | PM864AK01 (3BSE018161R1) |
| Expanding I/O count significantly | PM865AK01 (3BSE031151R1) |
| New project / long lifecycle requirement | PM866AK01 (3BSE050198R1) |
| Budget-constrained, small application | PM851AK01 (3BSE018100R1) |
Not sure which model fits your system? Contact our technical team with your existing configuration details for a free selection consultation.
Quality Assurance & Sourcing
- Source: OEM-authorized channels and certified industrial surplus with full traceability.
- Inspection: Each unit undergoes visual inspection, functional verification, and firmware version check before shipment.
- Packaging: Anti-static ESD packaging with original or equivalent protective foam inserts.
- Documentation: Certificate of conformity and test report available upon request.
- Warranty: 12-month warranty against manufacturing defects.
How to Order
- Confirm your required part number: PM861AK01 / 3BSE018129R1
- Specify quantity and required delivery timeline.
- Contact us via email or phone for a formal quotation.
- Submit purchase order — we accept T/T, L/C, and major payment platforms.
- Receive shipment with full documentation within agreed lead time.
📧 support@konmask.com | 📞 +0086 19859288691
Replacement & Compatibility FAQ
Q: Can PM864AK01 directly replace PM861AK01 without software changes?
A: In most cases yes — the PM864 is backward compatible with PM861 application programs. However, a Control Builder M project re-download is recommended after hardware swap.
Q: Is the PM861AK01 still in production?
A: ABB has transitioned to newer generations (PM864/PM865/PM866). The PM861 is available as a spare part through authorized channels like Konmask.com.
Q: Does PM861AK01 support redundancy?
A: Yes. It supports hot-standby CPU redundancy when paired with a second PM861 and the appropriate redundancy cable (TK851V007).
Q: What is the difference between PM861AK01 and PM861AK02?
A: The AK02 variant includes an updated firmware baseline and minor hardware revision. Both are functionally equivalent for most applications.
Q: Can I use a refurbished PM861AK01?
A: Refurbished units from reputable suppliers like Konmask are tested and warranted. For SIL-rated or safety-critical loops, consult your system integrator before using non-new hardware.
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Contact: support@konmask.com | +0086 19859288691
