{"product_id":"allen-bradley-1756-l55m24-processor-module","title":"Allen-Bradley 1756-L55M24 Processor Module","description":"\u003cp\u003eConfigured for high-speed logic execution and complex control tasks in ControlLogix chassis architectures, the \u003cstrong\u003eAllen-Bradley 1756-L55M24\u003c\/strong\u003e (\u003cstrong\u003e1756-L55\u003c\/strong\u003e Processor Module) provides direct physical\/electrical execution. The controller integrates a 1756-L55 base unit fitted with a 1756-M24 memory card, establishing 3.5 MB of nonvolatile RAM for application program storage and tag database management. The processor interfaces directly across the local backplane to execute multi-tasking operating systems, managing cyclic I\/O updating, data handling, and communication parsing without dedicated external coprocessors.\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\u003eBase Model\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDaughterboard Extension\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eCombined Catalog Number\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eNonvolatile Memory Capacity\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1756-L55\u003c\/td\u003e\n\u003ctd\u003e1756-M12\u003c\/td\u003e\n\u003ctd\u003e1756-L55M12\u003c\/td\u003e\n\u003ctd\u003e1.5 MB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1756-L55\u003c\/td\u003e\n\u003ctd\u003e1756-M13\u003c\/td\u003e\n\u003ctd\u003e1756-L55M13\u003c\/td\u003e\n\u003ctd\u003e1.5 MB (with process execution enhancements)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1756-L55\u003c\/td\u003e\n\u003ctd\u003e1756-M14\u003c\/td\u003e\n\u003ctd\u003e1756-L55M14\u003c\/td\u003e\n\u003ctd\u003e3.5 MB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1756-L55\u003c\/td\u003e\n\u003ctd\u003e1756-M24\u003c\/td\u003e\n\u003ctd\u003e1756-L55M24\u003c\/td\u003e\n\u003ctd\u003e3.5 MB\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\u003e1756-L55M24\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\u003e0.75 lbs (0.34 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eControlLogix Single-Slot Standard Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e4.5 W (Backplane dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCPU Architecture\u003c\/td\u003e\n\u003ctd\u003eLogix5555 Controller Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntegrated Memory\u003c\/td\u003e\n\u003ctd\u003e3.5 MB Nonvolatile RAM (1756-M24 Expansion Board)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current\u003c\/td\u003e\n\u003ctd\u003e1.2 A at 5.1 VDC, 14 mA at 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Configuration\u003c\/td\u003e\n\u003ctd\u003eChassis Mount (1756 ControlLogix I\/O Chassis)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eControlLogix Deterministic Networks \u0026amp; Firmware Synchronization\u003c\/h3\u003e\n\u003cp\u003eThe module communicates over the local ControlLogix backplane using EtherNet\/IP deterministic networks and CIP interface logic. Backplane bus communication velocity allows deterministic, high-speed data exchanges between the controller and distributed I\/O racks. Firmware flash compatibility via RSLogix 5000 \/ Studio 5000 enables non-destructive system updates, ensuring system synchronization across local backplane expansion slots without physical alterations to module memory boards.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 1756-L55M24 controller module be inserted or removed under power (RIUP)?\u003c\/p\u003e\n\u003cp\u003eA: Yes, the 1756-L55M24 supports Removal and Insertion Under Power (RIUP) within a ControlLogix chassis. However, removing an active processor halts all running controller tasks and forces connected output modules into their predefined fault states.\u003c\/p\u003e\n\u003cp\u003eQ: How is memory retained on the 1756-L55M24 during a primary power loss?\u003c\/p\u003e\n\u003cp\u003eA: Nonvolatile memory operation relies on the 1756-M24 memory board paired with an operational battery backup assembly (such as the 1756-BA1 or 1756-BATM) installed on the 1756-L55 base unit to preserve processor RAM state during system power cycling.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVerify chassis frame grounding satisfies IEEE 1100 standards by establishing a direct low-impedance connection between the chassis grounding stud and the enclosure star ground point.\u003c\/li\u003e\n\u003cli\u003eAlign the module circuit board with top and bottom card guides of the assigned chassis slot, sliding the unit firmly until the top and bottom housing latches lock in place.\u003c\/li\u003e\n\u003cli\u003eEnsure the 1756-M24 memory expansion card is properly seated and mechanically secured to the 1756-L55 motherboard prior to inserting the complete assembly into the ControlLogix rack.\u003c\/li\u003e\n\u003cli\u003eMaintain a minimum clearance distance of 50 mm (2 inches) above and below the chassis assembly to preserve ambient air circulation across module cooling vents.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":48786282053822,"sku":"1756-L55M24","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/1756-L55M24_b0928192-d5fd-49ca-b3e0-87b4e5508fbd.png?v=1787710364","url":"https:\/\/www.autooiltech.com\/ar\/products\/allen-bradley-1756-l55m24-processor-module","provider":"AutoOilTech Limited","version":"1.0","type":"link"}