{"product_id":"allen-bradley-1756-l74-controllogix-programmable-automation-controller","title":"Allen-Bradley 1756-L74 ControlLogix Programmable Automation Controller","description":"\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1756-L74\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1756-L74\u003c\/strong\u003e Logix5574 Controller, operates as a dedicated hardware component for high-performance process execution and multi-axis control within ControlLogix system architectures. The processor provides 16 MB user memory and 0.98 MB I\/O memory to handle complex application logic, deterministic task scheduling, and data handling across up to 500 controller connections. Featuring an integrated USB 2.0 programming port and a 4-character alpha\/numeric diagnostic display, the module executes instruction cycles with high backplane throughput while maintaining active system telemetry without requiring external display interfaces.\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-L74\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\u003e0.33 lbs (0.15 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\u003e4.1 W (Backplane: 800 mA at 5.1 VDC, 5 mA at 1.2 VDC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUser Memory\u003c\/td\u003e\n\u003ctd\u003e16 MB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/O Memory\u003c\/td\u003e\n\u003ctd\u003e0.98 MB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eController Connections\u003c\/td\u003e\n\u003ctd\u003e500 max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Ports\u003c\/td\u003e\n\u003ctd\u003eUSB 2.0 (Full Speed, Type B)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisplay\u003c\/td\u003e\n\u003ctd\u003e4-Character Alpha\/Numeric Diagnostic Display\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eControlLogix System Architecture \u0026amp; Backplane Protocol Features\u003c\/h3\u003e\n\u003cp\u003eThe controller communicates over the local ControlLogix backplane bus utilizing high-velocity CIP (Common Industrial Protocol) framing. Backplane bus communication velocity guarantees deterministic data delivery and real-time controller-to-I\/O synchronization across local and distributed racks. High-density I\/O routing protocols manage up to 500 simultaneous controller connections, matching configured Requested Packet Interval (RPI) rates down to sub-millisecond execution cycles. Firmware flash compatibility enables online project downloads, firmware upgrades, and memory management via Studio 5000 Logix Designer software without interrupting chassis backplane power.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 1756-L74 controller be removed or inserted under power (RIUP)?\u003c\/p\u003e\n\u003cp\u003eA: Yes, the 1756-L74 supports Removal and Insertion Under Power (RIUP) within a powered ControlLogix chassis. However, removing the active controller halts CPU task execution and places associated output modules into their configured fault state.\u003c\/p\u003e\n\u003cp\u003eQ: Is a battery required to preserve program memory on the 1756-L74 during power interruption?\u003c\/p\u003e\n\u003cp\u003eA: No, the 1756-L74 utilizes non-volatile energy storage technology (Energy Storage Module \/ ESM) that transfers system memory to non-volatile flash memory upon main power loss, eliminating the reliance on traditional lithium batteries.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEnsure backplane chassis grounding complies with IEEE 1100 standards; verify a dedicated low-impedance ground connection connects the chassis grounding lug directly to the enclosure single-point star ground.\u003c\/li\u003e\n\u003cli\u003eAlign the module PCB board edges with the top and bottom chassis guides, sliding the controller firmly into the rack slot until both locking tabs latch completely.\u003c\/li\u003e\n\u003cli\u003eAvoid using the front USB port for permanent online network connections; the USB interface is intended strictly for temporary local programming, configuration, and maintenance diagnostics.\u003c\/li\u003e\n\u003cli\u003eEnsure proper enclosure airflow by maintaining a minimum vertical clearance of 50 mm (2 inches) above and below the ControlLogix chassis to prevent thermal buildup around the processor.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":48786281201854,"sku":"1756-L74","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/1756-L74.png?v=1787710354","url":"https:\/\/www.autooiltech.com\/products\/allen-bradley-1756-l74-controllogix-programmable-automation-controller","provider":"AutoOilTech Limited","version":"1.0","type":"link"}