Description
| Product model | 3BDH000733R1 |
| Manufacturer | ABB |
| Product category | Programmable Logic Controller (PLC) CPU module |
| Series / Platform | AC 800M / System 800xA |
| Module designation | PM864 |
| Processor | 32-bit RISC, 100 MHz |
| Application memory | 32 MB RAM (battery-backed), 16 MB flash |
| Execution speed | 0.15 µs per Boolean instruction |
| Communication ports | 1× RS-232 (service), 1× 10/100 Mbps Ethernet (Modbus TCP, IEC 61850) |
| Redundancy support | Yes – with PM864 redundant pair and CI854 modules |
| I/O capacity | Up to 16,000 I/O points via S800/S900 I/O buses |
| Operating temperature | 0°C to +60°C |
| Power consumption | Approx. 5 W |
| Mounting | DIN rail in standard AC 800M controller rack |
| Status indicators | RUN, STOP, ERROR, COMM, REDUNDANCY LEDs |
Product Introduction
The ABB 3BDH000733R1 is the official part number for the PM864 central processing unit within ABB’s AC 800M controller family—a cornerstone of the System 800xA distributed control platform. This module serves as the brain of medium-to-large-scale automation systems in power, oil & gas, mining, and heavy industry. It executes control logic, manages I/O communication, and interfaces with engineering workstations, HMIs, and enterprise systems.
Designed for deterministic real-time performance, the ABB 3BDH000733R1 combines a high-speed RISC processor with robust communication capabilities, including native Ethernet for Modbus TCP and IEC 61850 protocols. Its integrated redundancy architecture allows seamless failover in critical applications, ensuring continuous operation even during hardware faults. Though newer CPUs like the PM866 exist, the ABB 3BDH000733R1 remains widely deployed due to its proven reliability and extensive installed base.
Core Advantages and Technical Highlights
Core Advantages and Technical HighlightsDeterministic Real-Time Performance:
The ABB 3BDH000733R1 executes Boolean logic in just 0.15 microseconds—fast enough for turbine protection, burner management, or fast interlocking. Unlike general-purpose industrial PCs, this dedicated PLC architecture guarantees cycle time consistency regardless of background tasks.
The ABB 3BDH000733R1 executes Boolean logic in just 0.15 microseconds—fast enough for turbine protection, burner management, or fast interlocking. Unlike general-purpose industrial PCs, this dedicated PLC architecture guarantees cycle time consistency regardless of background tasks.
Native Redundancy Without Add-Ons:
Unlike competitive platforms that require extra modules for redundancy, the ABB 3BDH000733R1 supports hot-standby operation out of the box when paired with a second PM864 and CI854 communication interfaces. Synchronization occurs over a dedicated fiber or copper link, with switchover under 100 ms—transparent to field I/O.
Unlike competitive platforms that require extra modules for redundancy, the ABB 3BDH000733R1 supports hot-standby operation out of the box when paired with a second PM864 and CI854 communication interfaces. Synchronization occurs over a dedicated fiber or copper link, with switchover under 100 ms—transparent to field I/O.
Integrated Industrial Networking:
The built-in 10/100 Mbps Ethernet port on the ABB 3BDH000733R1 supports multiple protocols simultaneously: Modbus TCP for third-party devices, IEC 61850 for substation integration, and ABB’s proprietary AC 800M protocol for engineering access. No separate communication card is needed.
The built-in 10/100 Mbps Ethernet port on the ABB 3BDH000733R1 supports multiple protocols simultaneously: Modbus TCP for third-party devices, IEC 61850 for substation integration, and ABB’s proprietary AC 800M protocol for engineering access. No separate communication card is needed.
Legacy Compatibility with Future-Proofing:
Despite being a legacy model, the ABB 3BDH000733R1 runs the latest versions of Control Builder M (up to v6.x), allowing reuse of existing application code during system upgrades. Its 32 MB RAM accommodates complex batch recipes or multi-loop cascade strategies without performance degradation.
Despite being a legacy model, the ABB 3BDH000733R1 runs the latest versions of Control Builder M (up to v6.x), allowing reuse of existing application code during system upgrades. Its 32 MB RAM accommodates complex batch recipes or multi-loop cascade strategies without performance degradation.
Robust Diagnostics and Service Access:
Field engineers can connect directly via the RS-232 service port for diagnostics—even when the Ethernet network is down. The ABB 3BDH000733R1 logs detailed error codes, last scan time, and I/O status, accelerating troubleshooting during plant turnarounds.
Field engineers can connect directly via the RS-232 service port for diagnostics—even when the Ethernet network is down. The ABB 3BDH000733R1 logs detailed error codes, last scan time, and I/O status, accelerating troubleshooting during plant turnarounds.
Typical Application Scenarios
The ABB 3BDH000733R1 is commonly deployed in mission-critical process control applications where failure is not an option. In combined-cycle power plants, it manages boiler sequencing, steam turbine synchronization, and emissions control—all within a single redundant rack. The deterministic scan ensures protective interlocks trip before equipment damage occurs.
In oil & gas offshore platforms, the ABB 3BDH000733R1 controls emergency shutdown (ESD) and fire & gas (F&G) systems. Its redundancy capability meets SIL 2 requirements under IEC 61511, while the Ethernet port integrates with safety-rated HMIs and remote monitoring centers via secure VLANs.
Mining operations use the ABB 3BDH000733R1 for conveyor belt control and mill automation, where dust, vibration, and wide temperature swings demand rugged electronics. The module’s DIN-rail mounting and convection cooling (no fans) ensure long life in these harsh conditions. Even as plants modernize, many retain the ABB 3BDH000733R1 as a cost-effective solution for non-core processes.
Related Model Recommendations
Related Model Recommendations- PM866: Successor to PM864; higher memory and faster CPU; backward compatible
- CI854: Communication module required for redundant 3BDH000733R1 pairs
- CI864: Enhanced CI854 with faster bus cycle and dual Ethernet
- 3BSE013204R1: Battery module for RAM backup in 3BDH000733R1
- TK801V001: Programming cable (RS-232) for service port access
- AC 800M Rail: Standard DIN rail chassis for housing 3BDH000733R1 and I/O
- Control Builder M: ABB’s engineering software used to program the 3BDH000733R1
- S800 I/O Modules: Field I/O connected via CAN bus to the 3BDH000733R1
Installation, Commissioning and Maintenance Instructions
Installation preparation: Before installing the ABB 3BDH000733R1, confirm the controller rack is powered off and properly grounded. Ensure adequate spacing (minimum 50 mm above/below) for passive cooling. Verify that the firmware version of any redundant partner matches exactly—mismatched versions will prevent synchronization. Use ESD wrist straps during handling.
Maintenance suggestions: Replace the backup battery (3BSE013204R1) every 3–5 years to prevent RAM data loss during power interruptions. Monitor the “ERROR” LED—if solid red, check event logs via Control Builder M. For redundant systems, perform annual switchover tests to validate failover timing. Always keep a tested spare ABB 3BDH000733R1 on site with the same firmware and application image pre-loaded.
