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ABB Processor PM856A
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Specifications
| Brand | ABB |
|---|---|
| Model Number | PM856A (3BSE066490R1) |
| Official Product Name | AC 800M Processor Unit PM856A |
| Applicable System | ABB System 800xA / AC 800M controller |
| Product Type | Processor / CPU Unit |
| Equivalent Standard | Contact us for cross-reference and alternative models |
| Product Status | In Stock |
| Article Number | 3BSE066490R1 (PM856AK01) |
| Processor Type | MPC860 |
| Clock Frequency | 24 MHz |
| Memory | 16 MB RAM (10.337 MB available for the application) |
| Flash PROM for Firmware Storage | 2 MB |
| Ethernet Channels | 2 x RJ45 (CN1, CN2), 10 Mbit/s |
| Serial Ports | COM3 RS-232C (75-19200 baud), COM4 isolated configuration port |
| CompactFlash | Yes (program and data storage) |
| Real-Time Clock | Battery-backed lithium 3.6 V, stability 100 ppm (approx. 1 h/year) |
| Applications per Controller | 32 |
| Programs per Application | 64 |
| Tasks per Controller | 32 |
| CEX-Bus Communication Modules | up to 12 |
| I/O Capacity on Modulebus | max. 96 I/O modules |
| Performance (1000 boolean operations) | 0.46 ms |
| Power Supply | 24 V DC (19.2-30 V DC) |
| Power Consumption (+24 V) | typ. 180 mA / max. 300 mA |
| Power Dissipation | typ. 4.32 W (7.2 W max) |
| Redundancy | No |
| Protection Class | IP20 |
| Product Family | AC 800M (System 800xA) |
Product Description
It is built around an MPC860 microprocessor and provides 16 MB of RAM, with 10.337 MB available for the application, plus 2 MB of flash PROM for firmware storage. The CPU board includes a real-time clock, LED indicators, an INIT push button and a CompactFlash interface for program storage. On its TP830 base plate it offers two RJ45 Ethernet ports for the control network and two serial ports, one of which (COM4) is isolated for the configuration tool. It executes control logic and multitasking for process automation and mounts on a DIN rail with the slide-and-lock mechanism. The ABB PM856A is a processor unit for the AC 800M controller family within the System 800xA platform.
Basic Product Information
- 16 MB RAM with 10.337 MB available for the application
- 2 MB flash PROM for firmware storage plus battery-backed RAM retention
- Two RJ45 Ethernet ports (CN1, CN2) for the control network
- COM3 RS-232C and isolated COM4 configuration port
- CompactFlash interface for program and data storage
- DIN rail mounting with slide-and-lock mechanism, IP20 protection
- MPC860 microprocessor with 24 MHz clock frequency
Technical Specifications
Version & Model Difference
The PM856A is a mid-range CPU in the AC 800M PM8xx family. It differs from the PM851A mainly in its larger application RAM, and it is slower than the PM860A, which runs the same application program about twice as fast. It does not support redundancy or High Integrity operation, so redundant or safety duties require a different AC 800M CPU. It mounts on the TP830 base plate and can host up to 12 CEX-bus communication modules.
Application Scenarios
- Process control in power plants and refineries
- Petrochemical and chemical plant automation
- Large-scale manufacturing and utility control systems
- Non-redundant 800xA control stations and distributed I/O stations
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Frequently Asked Questions
What processor and memory does the PM856A have?
It uses an MPC860 microprocessor and provides 16 MB of RAM, with 10.337 MB available for the application and 2 MB of flash PROM for firmware.
How many communication ports are available?
Two RJ45 Ethernet ports (CN1, CN2) for the control network plus two serial ports: COM3 (RS-232C) and an isolated COM4 for the configuration tool.
Does the PM856A support redundancy?
No. The PM856A is a non-redundant AC 800M CPU designed for single-controller configurations.
What base plate and engineering tool does it use?
It mounts on the TP830 processor base plate and is configured with the 800xA Control Builder.
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