{"product_id":"1769-l31-allen-bradley-compactlogix-512kb-programmable-controller","title":"1769-L31 Allen-Bradley CompactLogix 512KB Programmable Controller","description":"\u003ch3\u003eEngineering Overview \u0026amp; System Architecture\u003c\/h3\u003e\n\u003cp\u003eThe \u003cspan style=\"color: #0056b3;\"\u003e**1769-L31**\u003c\/span\u003e is a compact, high-efficiency Programmable Automation Controller (PAC) belonging to the \u003cspan style=\"color: #0056b3;\"\u003e**CompactLogix**\u003c\/span\u003e platform by \u003cspan style=\"color: #0056b3;\"\u003e**Allen-Bradley**\u003c\/span\u003e (Rockwell Automation). Designed for small-to-medium-scale discrete and process automation, the \u003cspan style=\"color: #0056b3;\"\u003e**1769-L31**\u003c\/span\u003e combines robust processing capability, dual serial interfaces, and flexible modular expansion within a single-slot footprint.\u003c\/p\u003e\n\u003ch3\u003eCore Technical Specifications\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse: collapse; width: 100%;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eModule Specification Detail\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer \u0026amp; Brand\u003c\/td\u003e\n\u003ctd\u003eRockwell Automation \/ Allen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series \u0026amp; Type\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan style=\"color: #0056b3;\"\u003e**\u003ca href=\"https:\/\/www.plcsparehub.com\/collections\/allen-bradley-1769-compactlogix\"\u003eCompactLogix\u003c\/a\u003e**\u003c\/span\u003e Programmable Automation Control Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Catalog Number\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"color: #0056b3;\"\u003e**1769-L31**\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUser Memory Capacity\u003c\/td\u003e\n\u003ctd\u003e512 Kilobytes (Expandable via CompactFlash cards)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Ports\u003c\/td\u003e\n\u003ctd\u003eTwo (2) independent RS-232 serial interfaces (Channel 0 \u0026amp; Channel 1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Current Draw\u003c\/td\u003e\n\u003ctd\u003e330 mA @ 5 VDC and 40 mA @ 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTask Handling Capacity\u003c\/td\u003e\n\u003ctd\u003eSupports up to 4 concurrent tasks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNon-Volatile Storage Options\u003c\/td\u003e\n\u003ctd\u003eCompatible with 1784-CF64 or 1784-CF128 Industrial CompactFlash cards\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eOperational Modes \u0026amp; System Compatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSerial Protocols:\u003c\/strong\u003e Channel 0 provides full galvanic isolation supporting DF1, DH-485, and ASCII protocols; Channel 1 offers non-isolated connection supporting DF1 and DH-485 up to 38.4 kbps.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI\/O Expansion Limits:\u003c\/strong\u003e Supports up to 16 local I\/O modules distributed across up to 3 separate I\/O banks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply Distance Rating:\u003c\/strong\u003e Must be positioned as the leftmost module and located within 4 modules of the system power supply unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery Backup:\u003c\/strong\u003e Utilizes a replaceable \u003cspan style=\"color: #0056b3;\"\u003e**1769-BA**\u003c\/span\u003e lithium battery module to preserve user memory and program logic during power outages.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Guidelines \u0026amp; Commissioning Convenience\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMount the controller securely onto a standard DIN rail or directly to a panel backplate inside an approved industrial enclosure.\u003c\/li\u003e\n\u003cli\u003eConnect programming cables such as the 1756-CP3 or 1747-CP3 to the serial communication ports using standard 22-14 AWG copper wiring.\u003c\/li\u003e\n\u003cli\u003eVerify that all local expansion modules fall within the strict 4-slot power supply distance limit from the left rack edge.\u003c\/li\u003e\n\u003cli\u003eMonitor independent status LEDs (RUN, FORCE, BAT, OK, I\/O, CH0, CH1) to verify controller health during startup diagnostics.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDiagnostic Capabilities \u0026amp; Industrial Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReal-Time Diagnostics:\u003c\/strong\u003e Front-panel indicators track forced I\/O states, battery voltage degradation, and communication traffic.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShock \u0026amp; Vibration Tolerance:\u003c\/strong\u003e Engineered to withstand 30g operating shock and 5G vibration profiles ranging from 10 to 500 Hz.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTarget Applications:\u003c\/strong\u003e Deployed in compact packaging machines, wastewater pump stations, discrete conveyor sorting cells, and OEM automated skids.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGlobal PLC Spare HUB's Insight\u003c\/h3\u003e\n\u003cp\u003eAutomation engineers deploying the \u003cspan style=\"color: #0056b3;\"\u003e**1769-L31**\u003c\/span\u003e frequently overlook backplane distance rules when scaling beyond single-rack configurations. During a recent multi-bank conveyor system retrofit, our engineering team resolved intermittent communication timeouts by repositioning the controller directly adjacent to the system power supply and validating bus current loads across all three I\/O banks.\u003c\/p\u003e\n\u003ch3\u003eLogistics, Packaging \u0026amp; Warranty Terms\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Inclusion:\u003c\/strong\u003e 1x \u003cspan style=\"color: #0056b3;\"\u003e**1769-L31**\u003c\/span\u003e CompactLogix Controller Module (Battery included).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFulfillment Schedule:\u003c\/strong\u003e Fast 24 to 48-hour order processing and dispatch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlobal Couriers:\u003c\/strong\u003e Secure worldwide shipping handled via FedEx, UPS, and DHL.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty Assurance:\u003c\/strong\u003e Fully protected by a comprehensive 12-month operational warranty.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ) \u0026amp; Buying Guide\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the primary difference in isolation between Channel 0 and Channel 1 on this controller?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Channel 0 is a fully isolated RS-232 port supporting DF1, DH-485, and ASCII, whereas Channel 1 is a non-isolated port restricted to DF1 and DH-485 protocols.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use third-party lithium batteries as a replacement for the memory backup?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: No, the \u003cspan style=\"color: #0056b3;\"\u003e**1769-L31**\u003c\/span\u003e requires the official \u003cspan style=\"color: #0056b3;\"\u003e**1769-BA**\u003c\/span\u003e battery module to ensure proper voltage output and reliable SRAM data retention.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What happens if the controller exceeds the 4-module distance limit from the power supply?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Placing the controller further than 4 modules away from the power supply will result in bus voltage starvation, preventing proper backplane communication and startup.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How can I expand the non-volatile memory storage on this CompactLogix controller?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: You can insert an industrial-grade CompactFlash card, such as the 1784-CF64 or 1784-CF128, into the built-in card slot for permanent program backup.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Buying Guide: When should I choose the 1769-L31 over a modular ControlLogix system?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Select the \u003cspan style=\"color: #0056b3;\"\u003e**1769-L31**\u003c\/span\u003e when your application requires a cost-effective, fixed-memory controller for standalone machine automation without the high channel density of large chassis systems.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":45013811232950,"sku":"1769-L31","price":165.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/1769-L31.jpg?v=1788944916","url":"https:\/\/www.plcsparehub.com\/products\/1769-l31-allen-bradley-compactlogix-512kb-programmable-controller","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}