{"product_id":"abb-pm856a-3bse066490r1-ac-800m-processor-unit-new","title":"ABB PM856A 3BSE066490R1 AC 800M Processor Unit New","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eABB PM856A (Part Number: 3BSE066490R1)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eserves as the high-performance computational heart of the AC 800M distributed control system. This brand-new, original processor unit executes complex control logic and manages high-speed multitasking for ABB’s 800xA DCS platform. Built on a 32-bit RISC architecture, the PM856A coordinates data exchange between fieldbus subsystems and the central control network. It provides the necessary processing power for demanding industrial applications, ensuring deterministic execution of automation tasks in power plants, refineries, and large-scale manufacturing facilities.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eThe PM856A utilizes advanced memory protection and high-speed interfaces to maintain system integrity:\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eAttribute\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification Details\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eABB Group\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel \/ Part Number\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePM856A \/ 3BSE066490R1\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e100% Brand New, Factory Original\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eProcessor Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e32-bit RISC Microprocessor (~200 MHz)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMemory Capacity\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e16 MB RAM (with ECC) \/ 4 MB Flash\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eEthernet Ports\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2 × RJ45 (CN1, CN2) supporting Redundancy\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSerial Ports\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eCOM3 (RS-232C), COM4 (Isolated Configuration)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eExpansion Capability\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eCEX-bus (supports up to 12 communication modules)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBackup Features\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eBattery-backed Real-Time Clock and Memory\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eStorage Interface\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eCompactFlash Slot for program\/data storage\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e–25°C to +70°C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e142 × 73.5 × 373 mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cp\u003eThe ABB PM856A eliminates the risks of data corruption through the integration of\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eECC (Error Correction Code) memory\u003c\/strong\u003e. In industrial environments where high-frequency noise can cause \"bit-flips,\" ECC memory automatically detects and corrects single-bit errors, preventing processor crashes and maintaining continuous uptime. This hardware-level protection proves essential for 24\/7 process industries where a control failure results in significant financial loss.\u003c\/p\u003e\n\u003cp\u003eTo solve the challenge of network downtime, the PM856A features\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003edual redundant RJ45 Ethernet ports\u003c\/strong\u003e. These ports (CN1 and CN2) allow for separate physical connections to the control network, ensuring that the controller remains reachable even if a switch or cable segment fails. Furthermore, the unit simplifies commissioning through its\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eunique slide \u0026amp; lock DIN-rail mechanism\u003c\/strong\u003e. This mechanical design allows for rapid installation or hot-swapping within tight control cabinets without specialized tools. The\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eCEX-bus expansion interface\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efurther enhances flexibility, enabling the controller to bridge up to 12 different communication protocols—including Profibus DP, Modbus, and FOUNDATION Fieldbus—directly into the 800xA architecture, effectively centralizing diverse field data into a single, cohesive CPU.\u003c\/p\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the PM856A handle hardware identity in a networked environment?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEach PM856A unit possesses a unique hardware identity tied to its Ethernet MAC address, found on the TP830 baseplate label. The 800xA system uses this identity to automatically assign IP addresses and configuration parameters, preventing node conflicts during site-wide commissioning.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the PM856A store application logic without a constant power source?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The controller utilizes a battery-backed RAM system to retain data during short power interruptions. For long-term non-volatile storage, the integrated CompactFlash interface allows you to store the entire application program and configuration, enabling a \"cold start\" without a network download.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the function of the isolated COM4 port?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eABB specifically isolates COM4 to protect the internal CPU circuitry from electrical surges during configuration. While COM3 manages standard RS-232C modem signals, COM4 provides a secure point-of-entry for the Control Builder configuration tool, ensuring that ground loops from a technician's laptop do not damage the processor unit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this unit support hot-swapping in redundant configurations?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhen used in a redundant pair on a specialized baseplate, you can replace one PM856A while the other maintains active control of the process. This capability ensures zero-downtime maintenance for mission-critical automation systems.\u003c\/p\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":44106645373027,"sku":"PM856A 3BSE066490R1","price":676.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/5246\/8067\/files\/173_9c204628-b081-4e34-862c-9442b28ac87c.jpg?v=1775636947","url":"https:\/\/www.autocontrolglobal.com\/products\/abb-pm856a-3bse066490r1-ac-800m-processor-unit-new","provider":"AutoControl Global","version":"1.0","type":"link"}