{"product_id":"allen-bradley-compactlogix-1769-l31-series-a-cpu-processor","title":"Allen-Bradley CompactLogix 1769-L31 Series A CPU Processor","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong style=\"color: #0056b3;\"\u003e1769-L31\u003c\/strong\u003e is a reliable, standalone packaged controller belonging to Allen-Bradley's proven CompactLogix processor family. Featuring 512KB of integrated user memory alongside a non-volatile flash storage option, this module is specifically engineered for small to medium-scale industrial automation loops. Equipped with dual onboard serial communication ports, it offers a highly cost-effective, decentralized control layout for running dedicated machinery control sequences without requiring expensive Ethernet network overhead.\u003c\/p\u003e\n\n\u003ch2\u003eCore Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Serial Interfaces:\u003c\/strong\u003e Provides two standalone RS-232 communication lines—featuring an electrically isolated Channel 0 and a non-isolated Channel 1 setup.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Module Expansion:\u003c\/strong\u003e Supports the execution of complex control schemes with capacity for up to 16 native 1769 Compact I\/O modules split across 3 expansion banks.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Protocol Flexibility:\u003c\/strong\u003e Seamlessly manages data tables using industrial legacy protocols including DF1, DH-485, and raw ASCII character strings.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRugged System Architecture:\u003c\/strong\u003e Engineered to withstand harsh manufacturing floors with a high 5G operational vibration resistance and a 30G mechanical shock threshold.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"background-color: #f2f2f2;\"\u003e\n      \u003cth style=\"border: 1px solid #dddddd; text-align: left; padding: 6px;\"\u003eParameter\u003c\/th\u003e\n      \u003cth style=\"border: 1px solid #dddddd; text-align: left; padding: 6px;\"\u003eData\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003e\u003cstrong\u003eModel \/ Catalog Number\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003e1769-L31 (CompactLogix Controller Series)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003e\u003cstrong\u003eIntegrated User Memory\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003e512 Kilobytes (KB) volatile battery-backed SRAM\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003e\u003cstrong\u003eNon-Volatile Storage Option\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003eAccepts 1784-CF64 or 1784-CF128 CompactFlash cards\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003e\u003cstrong\u003eCommunication Hardware\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003e2 x RS-232 serial ports (Channel 0: Isolated \/ Channel 1: Non-Isolated)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003e\u003cstrong\u003eMaximum Data Baud Rate\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003eUp to 38.4 kbps max communication loop tracking speed\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003e\u003cstrong\u003eInternal Backplane Current\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003e330 mA @ 5V DC and 40 mA @ 24V DC logic consumption\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003e\u003cstrong\u003ePower Supply Distance Rating\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003eMaximum of 4 modules away from a 1769 power supply unit\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003e\u003cstrong\u003eModule Net Weight\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003e0.73 kg (1.61 lbs) estimated including backplane housing\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003e\u003cstrong\u003ePhysical Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003e203 × 203 × 127 mm (8.0 × 8.0 × 5.0 inches) box size\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003e\u003cstrong\u003eOperating Ambient Boundary\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003e0°C to +60°C (32°F to +140°F) Open-style enclosure\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003e\u003cstrong\u003eHarmonized Tariff Code\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #dddddd; padding: 6px;\"\u003e8537101190\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eEngineering \u0026amp; Installation Guide\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMounting Alignment \u0026amp; Weight Support:\u003c\/strong\u003e Weighing approximately \u003cstrong\u003e0.73 kg\u003c\/strong\u003e, mount the processor firmly onto a grounded TS35 DIN rail or choose direct rigid panel mounting. Because it utilizes an open-style chassis configuration, it must be installed inside a dust-free NEMA or IP54-rated protective enclosure cabinet.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePower Supply Distance Limits:\u003c\/strong\u003e Observe the structural 4-module maximum distance limit rule. The 1769-L31 processor card cannot sit further than 4 expansion slots away from its system power supply module (e.g., a 1769-PA2 or 1769-PB2), or voltage drops will destabilize the backplane logic.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExpansion Bank Cable Routing:\u003c\/strong\u003e When splitting your system layout out to the 16 maximum I\/O module boundary across 3 expansion banks, secure the 1769-CRR1 or 1769-CRL1 right\/left bank expansion cables tightly. Always fit an approved 1769-ECR or 1769-ECL end cap to terminate the open bus lines.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSerial Port Isolation Management:\u003c\/strong\u003e Channel 0 features absolute electrical isolation protection to safely wire peripheral field devices like modems, barcode readers, or third-party RTUs. Conversely, Channel 1 is completely non-isolated and must only connect to local, identically grounded hardware like programming laptops or HMI terminals to avoid ground loops.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical FAQs\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ1: Why does the 1769-L31 controller include a 1769-BA lithium battery assembly?\u003c\/strong\u003e\u003cbr\u003e\nA1: The 1769-BA lithium battery provides crucial backup voltage to keep the volatile 512KB SRAM user memory active when main power is dropped. This guarantees that your application logic, tag database arrays, and system event logs are safely retained. Always monitor the front panel \"BAT\" diagnostic LED and swap the battery module out while power is active to prevent program loss.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ2: Can I mirror or transfer my runtime program onto non-volatile storage without using software?\u003c\/strong\u003e\u003cbr\u003e\nA2: Yes. By installing an industrial-grade 1784-CF64 or 1784-CF128 CompactFlash card, you can configure the CPU via RSLogix 5000 to automatically flash-load the program memory image back into the internal SRAM processor space on power-up cycles, which simplifies recovery if a battery fails.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ3: How do the individual diagnostic status LEDs aid in local plant troubleshooting?\u003c\/strong\u003e\u003cbr\u003e\nA3: The controller features clear visual indicators: the RUN LED confirms active task scanning, the FORCE LED displays active I\/O overrides, and the OK LED flashes green or turns red to signal processing health status. Dedicated DHC0 and Channel LEDs flicker to verify active TX\/RX data exchange, indicating functional serial communication loops without a multimeter tool.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":51050306928772,"sku":"1769-L31","price":120.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/7454\/7844\/files\/1769-L31-1.jpg?v=1781442228","url":"https:\/\/www.etowonauto.com\/products\/allen-bradley-compactlogix-1769-l31-series-a-cpu-processor","provider":"Etowon Auto","version":"1.0","type":"link"}