PM851A-CPU 3BSE066484R1 Processor Unit ABB
Description
PM851A-CPU 3BSE066484R1 Processor Unit is a rail-mounted digital programmable controller CPU module from ABB, part of the AC 800M series, designed for industrial automation and process control applications.
| Specification | Value |
|---|---|
| Processor Type | MPC860 |
| Clock Frequency | 24 MHz |
| RAM Memory | 8 MB; 12 MB from version 5.1 FP4 |
| RAM Available for Applications | 2.282 MB; 6.253 MB from version 5.1 FP4 |
| Flash Memory for Application/Data Storage | Yes |
| Flash PROM for Firmware Storage | 2 MB |
| CPU Redundancy Support | No |
| Performance (1000 Boolean Operations) | 0.46 ms |
| Power Supply | 24 V DC (19.2 – 30 V DC), max 5% ripple, compliant with IEC 61131-2 |
| Power Consumption (+24 V) | 180 mA typical, 300 mA maximum |
| Typical Power Dissipation | 4.32 W |
| Internal Power Reservoir | 5 ms, sufficient for controlled power down |
| Built-in Backup Battery | Lithium, 3.6 V, 0.95 Ah, size 1/2 AA, 0.3 g lithium content |
| Real-time Clock Stability | 100 ppm (approx. 1 hour per year) |
| Clock Synchronization | 1 ms between AC 800M controllers via CNCP protocol |
| Max I/O Capacity on Modulebus | 24 I/O modules |
| Max I/O Capacity on PROFIBUS | 99 I/O stations (max 62 redundant), 24 I/O modules per station (max 12 redundant) |
Key Features:
- Rail-mounted modular design for easy installation and expansion
- Detachable 4-pole screw terminal block for power connection
- Supports redundant power supply with dual status inputs (SA, SB)
- Integrated real-time clock with battery backup
- Includes CompactFlash interface, one usable RJ45 Ethernet port, RS-232C serial port, and isolated configuration port
- IP20 protection rating, no external enclosure required
- Full EMC certification for reliable industrial operation
Applications:
- Industrial automation systems
- Process control in manufacturing and energy production
- Logistics and material handling systems
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