{"product_id":"allen-bradley-1747-l551-d-slc-5-05-processor-module","title":"Allen-Bradley 1747-L551\/D SLC 5\/05 Processor Module","description":"\u003ch1 class=\"PDq2pG_selectionAnchorContainer\"\u003eAllen-Bradley 1747-L551\/D SLC 5\/05 Processor Module\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h1\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1747-L551\/D\u003c\/strong\u003e, also cataloged as the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1747-L551\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eprocessor module, serves as the primary SLC 5\/05 CPU unit utilized to execute deterministic control logic processing across SLC 500 chassis-based automation platforms.\u003c\/p\u003e\n\u003cp\u003eConfigured for Ethernet-based control execution in SLC 500 architectures, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1747-L551\/D\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(\u003cstrong\u003e1747-L551\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eprocessor module) provides direct scan-cycle computation and memory-resident program execution through embedded RS-232 and Ethernet communication interfaces.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cp\u003eThe suffix “\/D” indicates a revision-level hardware or firmware iteration within the 1747-L551 lifecycle. No further functional segmentation is defined in the provided dataset. No additional option codes are specified.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003cth class=\"last:pe-10\"\u003eParameter\u003c\/th\u003e\n\u003cth class=\"last:pe-10\"\u003eSpecification\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\/D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.31 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e3.2 cm x 14.6 cm x 12.7 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 - 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e4 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMemory Capacity\u003c\/td\u003e\n\u003ctd\u003e64 K words\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Digital I\/O\u003c\/td\u003e\n\u003ctd\u003e8192\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Analog I\/O\u003c\/td\u003e\n\u003ctd\u003e480\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Ports\u003c\/td\u003e\n\u003ctd\u003eRS-232, Ethernet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eScan Time\u003c\/td\u003e\n\u003ctd\u003e~0.9 ms\/K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eAllen-Bradley SLC 5\/05 Backplane \u0026amp; Ethernet Execution Characteristics\u003c\/h3\u003e\n\u003cp\u003eThe SLC 5\/05 CPU integrates backplane-resident execution scheduling, where instruction handling is synchronized through chassis-level bus arbitration. Ethernet communication operates over TCP\/IP with deterministic frame handling for PLC-to-SCADA data exchange. Firmware execution is tied to fixed-cycle scan processing, limiting variability in instruction throughput under stable load conditions. Memory segmentation supports program, data table, and communication buffers within a 64 K words architecture.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1747-L551\/D support hot-swap removal during operation?\u003cbr\u003eA: No. The SLC 500 CPU modules are not designed for live insertion or removal under energized backplane conditions.\u003c\/p\u003e\n\u003cp\u003eQ: What is the Ethernet communication behavior under heavy I\/O load?\u003cbr\u003eA: Ethernet TCP\/IP messaging shares CPU scan resources; increased I\/O density may increase communication latency due to scan cycle contention.\u003c\/p\u003e\n\u003cp\u003eQ: Is firmware compatible across all SLC 5\/05 revisions?\u003cbr\u003eA: Firmware compatibility is revision-dependent; mismatch between CPU firmware and programming tools may prevent successful download or online edits.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eThe module shall be installed into a powered-down SLC 500 chassis only. Ensure full seating into the backplane connector before applying chassis power. Maintain separation between Ethernet cabling and high-noise motor or relay wiring to reduce signal interference. RS-232 programming port shall be used with shielded cable where long programming links are required. Grounding continuity of the chassis must be verified prior to commissioning to ensure stable communication referencing.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43552086196314,"sku":"1747-L551\/D","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1747-L542C1.jpg?v=1782357834","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1747-l551-d-slc-5-05-processor-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}