{"product_id":"1756-l55m23-allen-bradley-controllogix-logix5555-cpu-processor","title":"1756-L55M23 | Allen-Bradley | ControlLogix Logix5555 CPU Processor","description":"\u003cp\u003eConfigured for high-speed logic execution in ControlLogix networks, the \u003cstrong\u003eAllen-Bradley 1756-L55M23\u003c\/strong\u003e (\u003cstrong\u003e1756-L55M23\u003c\/strong\u003e Logix5555 Processor) provides direct physical\/electrical execution. This hardware unit manages up to 128,000 I\/O points and utilizes a 1.5 MB RAM and 1.5 MB nonvolatile memory architecture to facilitate command processing and synchronized data exchange across the backplane bus.\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\u003e1756-L55M23\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\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\u003e0.69 lbs (0.31 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard ControlLogix single-slot form factor\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\u003e1.23 A at 5 VDC; 14 mA at 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRAM \/ Nonvolatile Memory\u003c\/td\u003e\n\u003ctd\u003e1.5 MB \/ 1.5 MB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax I\/O Capacity\u003c\/td\u003e\n\u003ctd\u003e128,000 Total I\/O\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProfinet \/ EtherNet\/IP Deterministic Networks\u003c\/h3\u003e\n\u003cp\u003eThe 1756-L55M23 relies on deterministic backplane bus communication to synchronize state data across the ControlLogix rack environment. Effective I\/O density scaling is constrained by the processor task scan times; users must ensure that total network overhead does not compromise the 0.08 ms program scan time performance. Firmware flash compatibility is mandatory between the controller and all distributed I\/O bridges; users should verify current firmware revisions to maintain network determinism and prevent packet transmission errors.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1756-L55M23 support hot-swapping?\u003c\/p\u003e\n\u003cp\u003eA: Yes. The module is designed for removal and insertion under power (RIUP) within a powered ControlLogix chassis, provided that system-level safety procedures for the specific application are followed.\u003c\/p\u003e\n\u003cp\u003eQ: What is the purpose of the 1756-BA1 or 1756-BATM battery?\u003c\/p\u003e\n\u003cp\u003eA: The battery maintains the volatile RAM content of the processor during power loss. If the battery voltage drops below specified thresholds, data integrity in the RAM can be compromised, requiring a reload of the project from the nonvolatile memory or an external programming terminal.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlot Configuration\u003c\/strong\u003e: The processor must be inserted into an available slot within the ControlLogix chassis. Ensure the module is properly keyed and fully seated to ensure reliable backplane bus communication.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Management\u003c\/strong\u003e: Install the chassis in an environment with sufficient convective airflow. The processor generates heat during operation; ensure the ambient temperature remains within the specified 0 deg C to 60 deg C range to prevent derating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrounding and Shielding\u003c\/strong\u003e: Ensure the chassis is bonded to the equipment ground bus with a low-impedance connection. This mitigates electromagnetic interference (EMI) that can disrupt the high-speed backplane signals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery Handling\u003c\/strong\u003e: Install the 1756-BA1 or 1756-BATM battery into the battery housing on the front of the processor. Ensure the connector is fully inserted; replace the battery according to the status indicator signals on the front panel.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":53533902078136,"sku":"1756-L55M23","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/1756-L55M24_0186b9b7-feac-456e-925d-0305165d4b7b.jpg?v=1780292689","url":"https:\/\/www.globalpetroparts.com\/products\/1756-l55m23-allen-bradley-controllogix-logix5555-cpu-processor","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}