{"product_id":"abb-pm856a-cpu-processor-unit-3bse066489r1","title":"ABB PM856A CPU Processor Unit 3BSE066489R1","description":"\u003cp\u003eThe \u003cstrong\u003eABB PM856A 3BSE066489R1\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003ePM856A\u003c\/strong\u003e CPU Processor Units, operates as a dedicated hardware component for central application processing and system control execution within ABB AC 800M platforms.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003ePM856A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e3BSE066489R1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eABB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eCPU Processor Units\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eSweden\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.80 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e119 x 135 x 185 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to +55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e24 VDC (Backplane power bus)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClock Frequency\u003c\/td\u003e\n\u003ctd\u003e24 MHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Memory\u003c\/td\u003e\n\u003ctd\u003e16 MB RAM (10.337 MB available for applications)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Interfaces\u003c\/td\u003e\n\u003ctd\u003e2 x RJ45 Ethernet ports (CN1, CN2), COM3 (RS-232C), COM4 (Isolated configuration)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExpansion Storage\u003c\/td\u003e\n\u003ctd\u003eCompactFlash Interface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection Class\u003c\/td\u003e\n\u003ctd\u003eIP20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Bus Communication Velocity and Firmware Flash Compatibility\u003c\/h3\u003e\n\u003cp\u003eThe processor architecture utilizes a 24 MHz clock frequency to manage real-time control loops and high-throughput data exchanges across connected I\/O racks. Dual RJ45 Ethernet ports maintain high backplane bus communication velocity and deterministic network synchronization across Control Network lines. Integrated system logic supports firmware flash compatibility, allowing deterministic program execution, online code changes, and fast diagnostic cycle updates across high-density I\/O configurations.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What is the available user memory capacity on the PM856A module for control applications?\u003c\/p\u003e\n\u003cp\u003eA: Out of the total 16 MB onboard RAM, 10.337 MB is specifically allocated for user application programs and runtime data storage.\u003c\/p\u003e\n\u003cp\u003eQ: Can the PM856A CPU unit be extracted or inserted under power?\u003c\/p\u003e\n\u003cp\u003eA: No, module removal or insertion must be performed only when the rack power supply is turned off to prevent transient power disruptions on the backplane bus.\u003c\/p\u003e\n\u003cp\u003eQ: How is structural chassis earth grounding established for the CPU unit?\u003c\/p\u003e\n\u003cp\u003eA: Earth ground connection is secured mechanically through the metal DIN-rail clip and rear grounding terminals when locked onto the base plate assembly.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eDisconnect all 24 VDC primary power sources before mounting or servicing the PM856A processor unit.\u003c\/li\u003e\n\u003cli\u003eWear an anti-static ESD wrist strap grounded to the enclosure frame before handling the module.\u003c\/li\u003e\n\u003cli\u003eSnap the 0.80 kg module firmly onto the backplane base plate until locking tabs engage completely.\u003c\/li\u003e\n\u003cli\u003eTorque all module retaining fasteners and connect earth ground straps directly to the cabinet ground bar.\u003c\/li\u003e\n\u003cli\u003eMaintain a minimum distance of 200 mm between Ethernet\/serial lines and 230 VAC\/480 VAC power conductors.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":53250311586101,"sku":"PM856A 3BSE066489R1","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/PM856A3BSE066489R1.png?v=1785909081","url":"https:\/\/www.5gplc.com\/products\/abb-pm856a-cpu-processor-unit-3bse066489r1","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}