ABB PM851K01 3BSE018168R1 is the core processor unit in the AC 800M series, belonging to the ABB 800xA Automation System. It is a non‑redundant modular controller designed for industrial control applications. PM851K01 and PM851AK01 are compatible models within the same series, sharing nearly identical core hardware and performance parameters.
Designed for DIN‑rail mounting, the unit is equipped with an MPC860 processor, integrates rich communication interfaces and high computing performance, and is suitable for small‑to‑medium industrial control applications. It supports configuration and programming via 800xA Control Builder and features high reliability, easy installation and maintenance, and full EMC certification. It operates stably in industrial, marine, and other demanding environments, serving as a key hardware component for industrial automation control.
Hardware & Performance Parameters
Processor & Computing Performance
- Processor: MPC860
- Clock frequency: 24 MHz
- Execution time for 1000 boolean operations: 0.46 ms
- Minimum application cycle time: 1 ms
- Supports up to 32 tasks and 32 different cycle times per controller, satisfying real‑time industrial control requirements.
Memory Configuration
- Total memory: 12 MB (from 800xA 5.1 FP4 onwards)
- Available application RAM: 6.253 MB
- 2 MB Flash PROM for firmware storage
- Supports Flash memory
- 3.6 V lithium backup battery for RAM to prevent data loss during power failure
- Real‑time clock accuracy: 100 ppm (approx. 1 hour deviation per year)
- Supports 1‑ms precision clock synchronization between AC 800M controllers via CNCP protocol.
Power Specifications
- Supply voltage: 24 V DC (wide range: 19.2–30 V DC)
- Typical/max operating current: 180 mA / 300 mA
- Typical/max power consumption: 4.32 W / 7.2 W
- Supports redundant power status input
- Max supply current for CEX bus: 2.4 A
- Max 24 V / 5 V supply for electrical Modulebus: 1.0 A / 1.5 A respectively.
Interface & Communication Capabilities
Ethernet Interface
- Base unit equipped with 2 RJ45 Ethernet ports (CN1, CN2)
- Only one Ethernet channel (CN1) is functional; no redundant Ethernet support
- Standard: IEEE 802.3
- Transmission speed: 10 Mbit/s
- 8‑pin RJ45 female connector
- Supported protocols: MMS (Manufacturing Message Specification), IAC (Inter‑Application Communication)
- Recommended control network: 100 Mbit/s switched Ethernet.
Serial Interface
- 2 RJ45 RS‑232C serial ports (COM3, COM4), non‑redundant
- COM3: non‑galvanically isolated, baud rate 75–19200 bps, full RTS‑CTS flow control, modem control signals
- COM4: galvanically isolated, fixed 9600 bps, no RTS‑CTS, dedicated for configuration tool connection.
Expansion & I/O Interface
- Supports 1 CEX bus communication module expansion
- Modulebus supports 1 electrical and 1 optical I/O cluster (non‑redundant CPU configuration)
- Max I/O modules: 24
- Modulebus scan rate: 0–100 ms (varies with number of I/O modules)
- Unique Ethernet address assigned per base unit, labeled on TP830 base, providing hardware identification for each CPU.
Data Communication
- Max event queue per OPC client: 3000 events
- Transmission rate to OPC server: 36–86 events/s, 113–143 data messages/s
Enables efficient data exchange with third‑party systems.
Software & Configuration Features
- Fully compatible with ABB 800xA Control Builder
- Supports IEC 61131‑3 standard programming
- Up to 32 applications per controller; 64 programs and 128 function charts per application
- CPU board integrates CompactFlash interface; application can be saved/downloaded via CF card, serial port, or Ethernet
- Supports multiple industrial protocols including Ethernet, PROFIBUS DP, enabling seamless integration with automation devices and fieldbus systems.
Mechanical & Installation Design
- Slide‑lock mechanism for fast DIN‑rail mounting and dismounting
- Dimensions (W × H × D): 119 mm × 186 mm × 135 mm (4.7 in × 7.3 in × 5.3 in)
- Net weight: 1100 g (2.4 lbs)
- Protection class: IP20 (EN 60529, IEC 529)
- Compact design for space‑efficient installation in control cabinets.
Environmental Characteristics
- Operating temperature: +5 °C to +55 °C (+41 °F to +131 °F)
- Storage temperature: -40 °C to +70 °C (-40 °F to +158 °F)
- Temperature change rate: max 3 °C/min (IEC/EN 61131‑2)
- Operating altitude: up to 2000 m
- Relative humidity: 5–95% non‑condensing
- Pollution class: 2
Corrosion protection: ISA 71.04 G3
EMC & Mechanical Resistance
- EMC compliant with EN 61000‑6‑4 (emission) and EN 61000‑6‑2 (immunity)
- Rated isolation voltage: 50 V
- Dielectric test voltage: 500 V AC
- Vibration resistance:
- 0.0375 mm at 10 < f < 50 Hz
- 0.5 g at 50 < f < 150 Hz
- 0.2 g at 5 < f < 500 Hz
- Operating noise: < 55 dB(A)
Core Advantages
- High Reliability: Clear diagnostics, full EMC certification, backup battery, hardware ID, marine and hazardous area approvals.
- Modularity & Scalability: Distributed expansion via CEX and Modulebus; multi‑application and multi‑program structure for high integration.
- Easy Installation & Maintenance: Tool‑less slide‑lock mounting, clearly arranged ports, simplified wiring, configuration, and troubleshooting.
- Industrial Compatibility: Wide voltage and temperature range, low power consumption (typical 4.32 W), suitable for enclosed, fanless cabinets.
Application Limitations
- Non‑redundant controller: no redundancy switching, no redundant Ethernet or redundant CPU support
- Not recommended for critical applications requiring high system redundancy
- Max I/O capacity: 24 Modulebus I/O modules
- Only 1 communication module via CEX bus
- Best suited for small‑to‑medium automation projects: general production lines, small process systems, local equipment control, etc.
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