{"product_id":"1785-l80b-programmable-logic-controller-allen-bradley-series-plc-5","title":"1785-L80B Programmable Logic Controller Allen-Bradley Series PLC-5","description":"\u003ch3\u003e\u003cb\u003eProduct Overview\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cspan style=\"color: #0056b3;\"\u003e\u003cb\u003e1785-L80B\u003c\/b\u003e\u003c\/span\u003e is an enhanced central processing unit within the Allen-Bradley \u003cspan style=\"color: #0056b3;\"\u003e\u003cb\u003ePLC-5\u003c\/b\u003e\u003c\/span\u003e platform.\u003c\/p\u003e\n\u003cp\u003eEquipped with 100,000 Words of static battery-backed RAM, it manages extensive industrial automation architectures.\u003c\/p\u003e\n\u003cp\u003eIt supports up to 3072 discrete I\/O points across 32 Remote I\/O (RIO) racks and 93 chassis locations.\u003c\/p\u003e\n\u003cp\u003eIntegrated multi-protocol communication channels facilitate peer-to-peer networking, supervisory SCADA integration, and distributed I\/O control.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eConfiguration \u0026amp; Network Interface Breakdown\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #0056b3;\"\u003e\u003cb\u003e1785-L80B\u003c\/b\u003e\u003c\/span\u003e — Enhanced PLC-5\/80 Central Processor Unit\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eChannel 0\u003c\/b\u003e — Front 25-pin EIA RS-232C\/422A\/423A isolated serial port supporting DF1 Full\/Half-Duplex and ASCII protocols.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eChannels 1A, 1B, 2A, 2B\u003c\/b\u003e — Four 3-pin phoenix and parallel 8-pin mini-DIN ports configurable individually as DH+ nodes, RIO Scanners, or RIO Adapters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eProgramming Terminals\u003c\/b\u003e — Dual parallel mini-DIN terminals dedicated to local programming devices and diagnostic tools.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eControl Coprocessor Slot\u003c\/b\u003e — Front expansion connector for specialized co-processing and custom interface modules.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eTechnical Specifications\u003c\/b\u003e\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification Category\u003c\/th\u003e\n\u003cth\u003eEngineering Parameter Value\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eManufacturer Brand\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley \/ Rockwell Automation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eCatalog Number\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"color: #0056b3;\"\u003e\u003cb\u003e1785-L80B\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003ePLC Platform\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan style=\"color: #0056b3;\"\u003e\u003cb\u003ePLC-5\u003c\/b\u003e\u003c\/span\u003e Enhanced Processor Family (PLC-5\/80)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eUser Program Memory\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e100 Kilowords (100K Words) Static RAM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eMemory Backup Options\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e1770-XYC High-Density Lithium Battery or 1785-ME16\/32\/64\/M100 EEPROM Modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eMaximum Total I\/O Capacity\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e3,072 Inputs + 3,072 Outputs (Complementary mode) \/ 3,072 Max Any Mix\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eI\/O Chassis \u0026amp; Rack Capacity\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 93 Total Chassis; Max 32 RIO Racks per link\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eRIO Transmission Rates\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e57.6 kbit\/s (10 ms scan), 115.2 kbit\/s (7 ms scan), 230.4 kbit\/s (3 ms scan)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eDH+ Cable Distance\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e3,048 m (10,000 ft) at 57.6 kbps; 762 m (2,500 ft) at 230.4 kbps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eBackplane Current Draw\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e2.3 Amps at 5 VDC backplane bus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003ePower Dissipation\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003e12 Watts maximum thermal output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cb\u003eRedundancy Support\u003c\/b\u003e\u003c\/td\u003e\n\u003ctd\u003eHardware and Software Hot-Backup System Compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cb\u003eChassis \u0026amp; Power Supply Compatibility\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eSupported 1771 I\/O Chassis:\u003c\/b\u003e 1771-A1B, 1771-A2B, 1771-A3B, 1771-A3B1, and 1771-A4B.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCompatible System Power Supplies:\u003c\/b\u003e 1770-P1, 1770-P45, 1770-P5, 1771-PE, 1771-P4S1, 1771-P6S1, 1771-P4R, and 1771-P6R.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eInstallation \u0026amp; Hardware Guidelines\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTurn off 1771 backplane power prior to inserting or removing the processor module.\u003c\/li\u003e\n\u003cli\u003eAlign the module with the leftmost slot (Slot 0) of the primary 1771 I\/O chassis until firmly seated.\u003c\/li\u003e\n\u003cli\u003eSet Channel 0 DIP switches according to the required electrical standard (RS-232, RS-422A, or RS-423).\u003c\/li\u003e\n\u003cli\u003eVerify that all nodes on a shared DH+ trunk line operate at identical baud rates (57.6k, 115.2k, or 230.4k baud).\u003c\/li\u003e\n\u003cli\u003eInstall a fresh 1770-XYC lithium battery prior to commissioning to preserve user RAM during power loss.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eWarranty Terms \u0026amp; Express Global Logistics\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBacked by a full 12-Month functional and hardware warranty from delivery date.\u003c\/li\u003e\n\u003cli\u003eOrders packed in anti-static protective containers and dispatched within 24 to 48 hours.\u003c\/li\u003e\n\u003cli\u003eWorldwide priority air freight provided via FedEx, UPS, and DHL express services.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eApplication Scenarios \u0026amp; System Diagnostics\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSupervisory master control in large-scale automotive assembly lines and paint shops.\u003c\/li\u003e\n\u003cli\u003eDistributed process control across oil refineries, chemical batching, and water treatment plants.\u003c\/li\u003e\n\u003cli\u003eHigh-density machinery control requiring redundant controller configurations for zero downtime.\u003c\/li\u003e\n\u003cli\u003eDiagnostic status LEDs: \u003cb\u003ePROC\u003c\/b\u003e (Green=Run, Red=Fault), \u003cb\u003eBATT\u003c\/b\u003e (Red=Low Battery), \u003cb\u003eFORCE\u003c\/b\u003e (Amber=I\/O Force Active), \u003cb\u003eCOMM\u003c\/b\u003e (Green=Channel 0 Active), plus individual status LEDs for CH1A, CH1B, CH2A, and CH2B.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eGlobal PLC Spare HUB's Insight\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eMaintaining Legacy \u003cspan style=\"color: #0056b3;\"\u003e\u003cb\u003ePLC-5\u003c\/b\u003e\u003c\/span\u003e infrastructure requires strict attention to memory backup and channel configuration.\u003c\/p\u003e\n\u003cp\u003eDuring a major plant overhaul at an automotive facility, an unannounced long-term power shutdown caused full program erasure on a primary controller whose internal 1770-XYC battery had secretly depleted.\u003c\/p\u003e\n\u003cp\u003eBecause the unit was not backed up with an optional 1785-ME EEPROM card, restoring operation caused extended downtime.\u003c\/p\u003e\n\u003cp\u003eInstalling the \u003cspan style=\"color: #0056b3;\"\u003e\u003cb\u003e1785-L80B\u003c\/b\u003e\u003c\/span\u003e along with a 1785-ME64 or 1785-M100 EEPROM module ensures complete program retentivity even during multi-month site outages with a dead battery.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eFrequently Asked Questions (FAQ)\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eQ: How do I determine whether to set Channels 1A through 2B as Remote I\/O Scanners or DH+ nodes during expansion?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eA: Configure the channel as a DH+ node if you need peer-to-peer messaging between PLCs or SCADA programming access. Select RIO Scanner mode when the \u003cspan style=\"color: #0056b3;\"\u003e\u003cb\u003e1785-L80B\u003c\/b\u003e\u003c\/span\u003e must directly control remote 1771 I\/O chassis, drives, or panel view interfaces.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: What precautions should I take regarding non-volatile memory when purchasing a backup processor for critical spare inventory?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eA: Static RAM loses logic data when unpowered without a good battery. Always pair your spare processor with a non-volatile 1785-ME16, ME32, ME64, or M100 memory module containing the pre-loaded ladder logic so the replacement can boot immediately without needing a laptop transfer.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: What is the primary cause of intermittent red PROC fault indicators during system startup?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eA: A solid red PROC light usually signals a severe memory corruption or hardware watchdog failure. An intermittent red light on boot often stems from 5VDC backplane voltage dip caused by an aging 1771-P4S1 or 1771-P6S1 power supply module dropping below 4.95 VDC under load.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: How do I troubleshoot communication dropouts on long DH+ cable runs connected to Channels 1A through 2B?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eA: First verify that 150-ohm (or 82-ohm for 230.4 kbps) terminating resistors are correctly installed across blue and white leads at both physical ends of the trunk. Next, confirm all connected nodes are fixed to identical baud rates, and check that total cable length does not exceed distance limits for that speed.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQ: Can a \u003cspan style=\"color: #0056b3;\"\u003e\u003cb\u003e1785-L80B\u003c\/b\u003e\u003c\/span\u003e processor be integrated into a modern Ethernet\/IP network without replacing the entire PLC-5 rack?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eA: Yes. You can route Channel 0 serial or Channel 1A\/2A DH+ signals through external bridge gateways (such as 1756-EN2T\/1756-DHRIO bridging racks or third-party protocol converters) to exchange tags with modern ControlLogix networks and modern HMI software.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":45013983264950,"sku":"1785-L80B","price":206.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/1785-L80B_ce07b701-8f33-48e6-bae3-23444a18a2b8.jpg?v=1786347164","url":"https:\/\/www.plcsparehub.com\/products\/1785-l80b-programmable-logic-controller-allen-bradley-series-plc-5","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}