{"product_id":"compactlogix-redundant-controller-allen-bradley-1769-l35cr","title":"CompactLogix Redundant Controller | Allen-Bradley 1769-L35CR","description":"\u003ch2\u003eAllen-Bradley 1769-L35CR CompactLogix Redundant Controller\u003c\/h2\u003e\n\u003cp\u003eConfigured for deterministic communication and mid-range execution in industrial automation networks, the \u003cstrong\u003eAllen-Bradley 1769-L35CR\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1769-L35CR\u003c\/strong\u003e CompactLogix Controller, operates as a dedicated hardware component for integrated control, serial processing, and motion interface within the CompactLogix 1769 platform.\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\u003e1769-L35CR\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\u003eChina\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eController Platform\u003c\/td\u003e\n\u003ctd\u003eCompactLogix\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUser Memory\u003c\/td\u003e\n\u003ctd\u003e1.5 MB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLocal I\/O Capacity\u003c\/td\u003e\n\u003ctd\u003eUp to 30 local 1769 I\/O modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntegrated Communication Ports\u003c\/td\u003e\n\u003ctd\u003e1 x RS-232 serial port, 1 x ControlNet port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNetwork Expansion Options\u003c\/td\u003e\n\u003ctd\u003eDeviceNet, EtherNet\/IP via external modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotion Control Capacity\u003c\/td\u003e\n\u003ctd\u003eUp to 4 axes via SERCOS interface module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProgramming Protocols\u003c\/td\u003e\n\u003ctd\u003eDF1, ASCII, Modbus RTU (via RS-232)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current Draw\u003c\/td\u003e\n\u003ctd\u003e800 mA at 5 VDC\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\u003eStorage Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to +85 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelative Humidity\u003c\/td\u003e\n\u003ctd\u003e5% to 95% RH, non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Software\u003c\/td\u003e\n\u003ctd\u003eRSLogix 5000 \/ Studio 5000 Logix Designer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eCE, UL, CSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eDeterministic Network Architecture\u003c\/h3\u003e\n\u003cp\u003eThe embedded ControlNet port executes scheduled, deterministic data transmissions where transmission updates occur deterministically regardless of changes in node count. Furthermore, the backplane architecture maintains a dedicated communication velocity across local I\/O modules, enabling deterministic coordination for motion axes up to 4 axes when linked to a SERCOS interface. Program logic execution relies on the local 1.5 MB memory capacity to execute system tasks alongside networked hardware segments without synchronization latency.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What is the maximum physical limitation for local I\/O expansion on the 1769-L35CR controller?\u003c\/p\u003e\n\u003cp\u003eA: The controller supports a maximum of 30 local 1769 I\/O modules. However, the configuration must not exceed the continuous backplane current capacity of 800 mA at 5 VDC without adding separate 1769 I\/O expansion power supplies.\u003c\/p\u003e\n\u003cp\u003eQ: Can this unit utilize the embedded RS-232 port for direct Modbus communication?\u003c\/p\u003e\n\u003cp\u003eA: Yes, the integrated RS-232 serial port is programmatically configurable via RSLogix 5000 or Studio 5000 to execute DF1, ASCII, or Modbus RTU master\/slave protocols for peripheral connectivity.\u003c\/p\u003e\n\u003cp\u003eQ: Is hot-swapping or removing modules under power permitted on the 1769 backplane?\u003c\/p\u003e\n\u003cp\u003eA: No, the 1769 CompactLogix platform does not support Removal and Insertion Under Power (RIUP). Power to the backplane bus must be isolated before adding or removing any local I\/O modules to prevent controller fault states or physical damage.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBus Extension Rigidity\u003c\/strong\u003e: Mount the hardware securely to standard DIN rails. Ensure the right-side bus terminator is fully engaged and locked to complete the internal backplane loop continuity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControlNet Cable Shielding\u003c\/strong\u003e: Utilize dual-shielded RG-6 coaxial cables with BNC connectors for all ControlNet connections. Keep network taps terminated with a 75-ohm resistor at the physical ends of the trunk line to eliminate signal reflections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrounding Requirements\u003c\/strong\u003e: Maintain a direct, low-impedance ground path from the DIN rail to the central enclosure ground copper bus bar using a minimum 14 AWG wire size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Management Clearances\u003c\/strong\u003e: Ensure a minimum clearance of 50 mm (2 inches) on all sides of the modular assembly to maintain ambient operational temperatures between 0 and +60 deg C via natural convection.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":44418652733539,"sku":"1769-L35CR","price":310.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/5246\/8067\/files\/213_93eebdcb-a325-4b2b-9f11-3241124af577.jpg?v=1785311925","url":"https:\/\/www.autocontrolglobal.com\/products\/compactlogix-redundant-controller-allen-bradley-1769-l35cr","provider":"AutoControl Global","version":"1.0","type":"link"}