{"product_id":"1785-l30b-allen-bradley-plc-5-series-cpu-module-32k-memory","title":"1785-L30B Allen-Bradley PLC-5 Series CPU Module | 32K Memory","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e1785-L30B\u003c\/strong\u003e is an industry-proven Programmable Logic Controller from the renowned PLC-5 series engineered by Allen-Bradley (Rockwell Automation). Designed for heavy-duty industrial processing, the \u003cstrong\u003e1785-L30B\u003c\/strong\u003e features 32K words of battery-backed user memory and comprehensive multi-network connectivity. Automation engineers rely on the \u003cstrong\u003e1785-L30B\u003c\/strong\u003e processor module to execute high-speed sequential logic, manage extensive universal remote I\/O configurations, and ensure continuous plant-floor operation.\u003c\/p\u003e\n\u003ch3\u003eTechnical \u0026amp; Environmental Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: Allen-Bradley \/ Rockwell Automation\u003c\/li\u003e\n\u003cli\u003eSeries: PLC-5 series\u003c\/li\u003e\n\u003cli\u003eModel: \u003cstrong\u003e1785-L30B\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eProduct Type: Programmable Logic Controller \/ Standard Processor\u003c\/li\u003e\n\u003cli\u003eUser Memory Capacity: 32 Kwords (Battery-backed static RAM)\u003c\/li\u003e\n\u003cli\u003eOptional Program Backup: Compatible with 1785-ME16, -ME32, -ME64, and -M100 EEPROM modules\u003c\/li\u003e\n\u003cli\u003eMaximum I\/O Capacity: 1024 points (any mix) or 1024 inputs + 1024 outputs (complementary)\u003c\/li\u003e\n\u003cli\u003eCommunication Interfaces: Two (2) DH+ \/ Remote I\/O ports (Adapter or Scanner), One (1) Serial port (RS-232, RS-423, RS-422A)\u003c\/li\u003e\n\u003cli\u003eBackplane Current Load: 2.3 Amps at 5V DC\u003c\/li\u003e\n\u003cli\u003ePower Dissipation: 12 Watts\u003c\/li\u003e\n\u003cli\u003eOperating Temperature Range: 0°C to 60°C (32°F to 140°F)\u003c\/li\u003e\n\u003cli\u003eNon-Operating Temperature Range: –40°C to 85°C (–40°F to 185°F)\u003c\/li\u003e\n\u003cli\u003eCompatible Power Supplies: 1771-P4S, 1771-P6S, 1771-P4S1, 1771-P6S1\u003c\/li\u003e\n\u003cli\u003eBackup Battery: 1770-XYC lithium cell unit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation \u0026amp; Configuration Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMount the \u003cstrong\u003e1785-L30B\u003c\/strong\u003e module directly into a compatible 1771 I\/O chassis backplane slot.\u003c\/li\u003e\n\u003cli\u003eSet the front three-position key-switch to PROG mode before downloading user application logic.\u003c\/li\u003e\n\u003cli\u003eConnect programming terminals or serial devices to the 25-pin RS-232\/422\/423 communication port.\u003c\/li\u003e\n\u003cli\u003eVerify proper DH+ cable termination resistance on channels 1A and 1B to eliminate signal reflection over long trunk lines.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDiagnostics \u0026amp; System Monitoring Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTrack processor health instantly using the dedicated front-panel LED indicators: PROC (controller state), BATT (battery health), FORCE (I\/O forces active), and COMM (serial activity).\u003c\/li\u003e\n\u003cli\u003eMonitor backup battery degradation with the BATT indicator, which provides up to 5 days of reserve warning notification once low-charge thresholds are crossed.\u003c\/li\u003e\n\u003cli\u003eUtilize channel-specific status indicators to isolate communication packet errors on Data Highway Plus or Remote I\/O loops.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTarget Equipment \u0026amp; Application Scenarios\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLarge discrete manufacturing and assembly lines utilizing 1771 universal remote I\/O chassis.\u003c\/li\u003e\n\u003cli\u003eContinuous process control applications requiring robust multi-drop Data Highway Plus backbones.\u003c\/li\u003e\n\u003cli\u003eLegacy automation upgrade projects requiring reliable drop-in replacement controllers.\u003c\/li\u003e\n\u003cli\u003eHeavy industrial material handling and automated conveyance networks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eOrdering, Shipping, and Warranty Terms\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInventory Status: In-stock and ready for immediate dispatch.\u003c\/li\u003e\n\u003cli\u003eProcessing Window: Fast 24-48 hour order handling.\u003c\/li\u003e\n\u003cli\u003eLogistics Carriers: Secure global shipping via FedEx, UPS, and DHL.\u003c\/li\u003e\n\u003cli\u003eWarranty Coverage: Comprehensive 12-month warranty included with every \u003cstrong\u003e1785-L30B\u003c\/strong\u003e unit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGlobal PLC Spare HUB's Insight\u003c\/h3\u003e\n\u003cp\u003eWhen maintaining vintage PLC-5 architectures, unexpected controller faults can paralyze a production line. Based on field expertise at Global PLC Spare HUB, technicians should proactively replace the 1770-XYC backup battery every 2 to 3 years, even if the BATT LED remains unlit, to prevent silent RAM data loss during unannounced plant power cuts. Additionally, verifying key-switch settings and maintaining a flashed EEPROM backup module on hand drastically reduces mean time to repair (MTTR) during emergency hardware swaps.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the typical operational lifespan of the 1770-XYC backup battery when power is removed?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAt an operating temperature of 60°C, a fully charged battery can maintain user memory for approximately 84 days at 100% initial capacity or 150 days at 50% capacity.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan an EEPROM module be used alongside the battery-backed RAM on the 1785-L30B?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, optional EEPROM modules (such as the 1785-ME32 or ME64) can be installed in the front panel slot to provide non-volatile program backup storage.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat shopping and selection criteria should engineers follow when sourcing a replacement controller?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eConfirm that your total I\/O point count does not exceed 1024, verify 1771 chassis power supply loading constraints (2.3A at 5V), and purchase exclusively from certified vendors offering a 12-month warranty.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat immediate troubleshooting step should be performed if the PROC indicator fails to turn green?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eVerify that the key-switch is toggled to the RUN or REM position, check backplane seating to ensure proper 5V power delivery, and review error codes via the programming software.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many universal remote I\/O chassis can be linked to this processor?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe controller supports up to 28 universal remote I\/O chassis within a maximum total architecture of 29 connected chassis loops.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":45013904359606,"sku":"1785-L30B","price":115.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/1785-L30B_aecc5d5b-4f94-491e-aed1-83a5948f139a.jpg?v=1790145469","url":"https:\/\/www.plcsparehub.com\/products\/1785-l30b-allen-bradley-plc-5-series-cpu-module-32k-memory","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}