ABB CMA122 3DDE300402 – Central Processing Unit Card | AC800M DCS Platform
Engineering Background
The ABB CMA122 (Part No. 3DDE300402) is a Central Processing Unit (CPU) card designed for ABB’s AC800M Distributed Control System (DCS) platform — one of the most widely deployed process automation architectures in power generation, oil & gas, pulp & paper, and chemical processing industries. The AC800M controller family is engineered for deterministic real-time control with high availability and redundancy support, making the CMA122 a mission-critical component in continuous-process environments.
Product Positioning
Procurement engineers sourcing the CMA122 are typically managing controller upgrades, spare-parts inventory replenishment, or emergency replacements in live production facilities. Konmask.com supplies verified surplus and refurbished CMA122 units with full traceability documentation, enabling rapid procurement without the lead times associated with OEM new-build orders. All units are inspected, function-tested, and shipped with appropriate ESD packaging.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model / Part Number | CMA122 / 3DDE300402 |
| Module Type | CPU Card (Central Processing Unit) |
| Platform Compatibility | AC800M DCS (PM861, PM864, PM866 controller families) |
| Communication Interface | MMS / IEC 61850, Modbus, PROFIBUS DP (platform-dependent) |
| Operating Voltage | 24 VDC (supplied via backplane) |
| Operating Temperature | 0 °C to +55 °C |
| Storage Temperature | −25 °C to +70 °C |
| Humidity | 5–95% RH, non-condensing |
| Approx. Weight | 140 g |
| Form Factor | Single-slot plug-in card (AC800M rack) |
| Certifications | CE, UL (platform-level); RoHS compliant |
| Firmware | Compatible with AC800M Control Builder M software suite |
| Redundancy Support | Hot-standby CPU redundancy (with compatible PM8xx controller) |
Proven Application Environments
- Power Generation: Turbine governor control, boiler management, and plant-wide SCADA integration using AC800M with CMA122 CPU cards.
- Oil & Gas: Upstream wellhead automation and downstream refinery process control with SIL-rated loop management.
- Pulp & Paper: Continuous digester control, bleaching sequence automation, and recovery boiler management.
- Chemical Processing: Batch reactor sequencing, temperature/pressure loop control, and safety interlock systems.
- Water Treatment: SCADA-integrated pump station control and dosing system automation.
Engineering Advantages
- Deterministic Scan Cycle: The AC800M CPU architecture guarantees deterministic task execution, critical for tight PID loop performance in process industries.
- Hot-Standby Redundancy: Supports bumpless switchover to standby CPU, minimizing process disruption during controller faults.
- Scalable I/O Architecture: Compatible with S800 I/O modules via CI801/CI830 interface units, enabling flexible distributed I/O expansion.
- IEC 61131-3 Programming: Fully programmable via ABB Control Builder M using Structured Text, Function Block Diagram, Ladder, and Sequential Function Chart.
- Long Service Life: AC800M platform has an established installed base with ABB committed to long-term spare parts availability.
System Architecture & Signal Flow
Within the AC800M rack, the CMA122 CPU card occupies the designated CPU slot and communicates with I/O modules via the internal S100 I/O bus or remote S800 I/O stations over PROFIBUS DP or MMS Ethernet. The CPU executes application programs compiled in Control Builder M, manages task scheduling, handles communication with supervisory SCADA/DCS layers (via OPC DA/UA or MMS), and coordinates redundancy switchover logic with the paired standby CPU module.
Typical signal flow: Field instruments → S800 I/O modules → CI8xx interface → AC800M backplane → CMA122 CPU → Control Builder M application logic → Supervisory DCS / SCADA layer.
Sourcing & Quality Verification
- All CMA122 units are sourced from decommissioned plant upgrades or authorized surplus channels.
- Each unit undergoes visual inspection, board-level cleaning, and functional power-on verification prior to listing.
- Units are shipped in anti-static ESD bags with foam-padded cartons to prevent transit damage.
- Traceability documentation (including source plant type and inspection record) available upon request for critical-infrastructure procurement.
- 30-day DOA (Dead on Arrival) warranty with return authorization process.
Procurement Process
- Confirm Compatibility: Verify your AC800M controller model (PM861/PM864/PM866) and firmware version with your ABB Control Builder M project file before ordering.
- Request a Quote: Contact support@konmask.com for volume pricing, lead time confirmation, and documentation packages.
- Order & Payment: B2B wire transfer (T/T), PayPal, and major credit cards accepted. Pro-forma invoice available.
- Shipping: DHL / FedEx Express worldwide. Export documentation (commercial invoice, packing list, COO) provided for customs clearance.
- Incoming Inspection: Recommend bench-testing the unit in a non-live rack before installation in a production system.
Technical FAQ
Q: Is the CMA122 (3DDE300402) compatible with all AC800M controller variants?
A: The CMA122 is designed for the AC800M platform. Compatibility depends on the specific PM8xx controller model and firmware revision. Please share your controller model and CB M version for confirmation.
Q: Can this unit support CPU redundancy?
A: Yes. When paired with a compatible PM8xx controller configured for redundancy, the CMA122 supports hot-standby operation with bumpless switchover.
Q: Do you provide firmware or software with the unit?
A: The CMA122 is a hardware module. ABB Control Builder M software is licensed separately through ABB. We can advise on compatible firmware versions.
Q: What is the lead time for this part?
A: In-stock units typically ship within 1–3 business days. Contact us for current stock status and expedited shipping options.
Q: Can I return the unit if it does not work?
A: Yes. We offer a 30-day DOA return policy. Units must be returned in original packaging with the inspection report included.
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