{"product_id":"allen-bradley-1747-l551-a-cpu-processors","title":"Allen Bradley 1747-L551\/A CPU Processors","description":"\u003cp\u003eConfigured for discrete and analog automation control in SLC 500 rack architectures, the \u003cstrong\u003eAllen-Bradley 1747-L551\/A\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1747-L551\/A\u003c\/strong\u003e SLC 5\/05 Processor Module, provides direct physical and electrical execution for program instruction processing and I\/O coordination.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eModel Identifier\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSeries \/ Platform\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eCore Function\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eMemory \u0026amp; Communication\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1747-L551\/A\u003c\/td\u003e\n\u003ctd\u003eSLC 500 \/ SLC 5\/05\u003c\/td\u003e\n\u003ctd\u003eCentral Processing Unit (CPU)\u003c\/td\u003e\n\u003ctd\u003e16 KB Memory, Ethernet \u0026amp; RS-232 Ports\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\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\u003e1747-L551\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley \/ Rockwell Automation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.64 lbs (0.29 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard SLC 500 single-slot module profile\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 deg C to 60 deg C (32 deg F to 140 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eBackplane current: 1000 mA at 5 VDC, 200 mA at 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCore Function\u003c\/td\u003e\n\u003ctd\u003eSLC 5\/05 Processor Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUser Memory\u003c\/td\u003e\n\u003ctd\u003e16 KB (Flash EEPROM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcessing Speed\u003c\/td\u003e\n\u003ctd\u003e0.9 ms per 1K of user program\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/O Capacity\u003c\/td\u003e\n\u003ctd\u003eUp to 8192 digital I\/O max across local chassis\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 Compatibility\u003c\/h3\u003e\n\u003cp\u003eConfigured for deterministic industrial network execution, the module maintains strict backplane bus communication velocity and real-time data exchange across local SLC 500 chassis racks. Firmware flash compatibility, integrated Ethernet communication, and multi-protocol RS-232 ports (supporting DH-485, DF1, Modbus, and ASCII) ensure synchronized instruction processing without introducing communication latency or timing jitter into the control loop.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What communication interfaces are available on the 1747-L551\/A processor?\u003c\/p\u003e\n\u003cp\u003eA: The processor features an integrated Ethernet port for network communications and programming, alongside an RS-232 port supporting DH-485, DF1, Modbus, and ASCII protocols.\u003c\/p\u003e\n\u003cp\u003eQ: Can this processor module be replaced while the chassis backplane is energized?\u003c\/p\u003e\n\u003cp\u003eA: No, system rack power must be fully isolated and de-energized prior to removing or inserting the processor module to prevent electrical arcing or backplane pin damage.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eEnsure all system power feeds and rack voltages are fully isolated and locked out prior to handling or mounting the 1747-L551\/A processor module. Secure the 0.64 lbs module firmly into slot 0 of the primary SLC 500 chassis backplane, ensuring proper mechanical engagement and tightening the retaining screws. Terminate network cables securely to the Ethernet and RS-232 ports, ensuring that all communication cable shields are grounded properly to the cabinet earth bar to mitigate electromagnetic interference.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":45291620270195,"sku":"1747-L551\/A","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0644\/4348\/2227\/files\/screenshot_2026-07-24_14-10-38.png?v=1785382356","url":"https:\/\/www.dcssupplier.com\/products\/allen-bradley-1747-l551-a-cpu-processors","provider":"DcsSupplier Limited","version":"1.0","type":"link"}