{"product_id":"allen-bradley-1785-l20c-plc-5-20-controlnet-processor-module-plc-5-series","title":"Allen-Bradley 1785-L20C PLC-5\/20 ControlNet Processor Module PLC-5 Series","description":"\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1785-L20C\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1785-L20C\u003c\/strong\u003e PLC-5\/20 ControlNet Processor Module, operates as a dedicated hardware component for controller execution and ControlNet communication within PLC-5 automation systems.\u003c\/p\u003e\n\u003ch3\u003eModel Identification and Configuration\u003c\/h3\u003e\n\u003cp\u003eThe 1785-L20C is a PLC-5 processor module with integrated ControlNet communication capability. It provides controller processing functions, local I\/O management, and network communication through the PLC-5 architecture.\u003c\/p\u003e\n\u003cp\u003eThe module includes one serial communication port, one coprocessor port, and 16 K memory capacity. It supports PLC-5 chassis-based configurations using 1771 I\/O modules with selectable digital and analog I\/O addressing structures.\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\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\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\u003e1785-L20C\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\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003ePLC-5\/20 ControlNet Processor Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003ePLC-5 Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.5 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e5.1 x 27.9 x 17.8 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 deg C to +60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 deg C to +85 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMemory Capacity\u003c\/td\u003e\n\u003ctd\u003e16 K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Network\u003c\/td\u003e\n\u003ctd\u003eControlNet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSerial Port\u003c\/td\u003e\n\u003ctd\u003e1 port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoprocessor Port\u003c\/td\u003e\n\u003ctd\u003e1 port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/O Addressing\u003c\/td\u003e\n\u003ctd\u003e2-slot addressing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDigital I\/O Modules\u003c\/td\u003e\n\u003ctd\u003e16\/32-point available\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog I\/O Modules\u003c\/td\u003e\n\u003ctd\u003e4\/8-channel available\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003e85-265 V AC or 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e25 W typical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003e1500 V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003ePLC-5 ControlNet Communication Architecture\u003c\/h3\u003e\n\u003cp\u003eThe 1785-L20C integrates ControlNet communication functions directly into the PLC-5 processor platform. The processor manages application execution, I\/O scanning, and network data exchange through the PLC-5 backplane and ControlNet interface.\u003c\/p\u003e\n\u003cp\u003eFor deterministic industrial networks, proper ControlNet scheduling, node configuration, and firmware compatibility are required. The processor maintains communication timing through the ControlNet network structure while executing ladder logic and controller tasks.\u003c\/p\u003e\n\u003cp\u003eThe PLC-5 architecture supports I\/O density scaling through 1771 module selection. Digital and analog I\/O capacity depends on chassis configuration, addressing mode, and installed modules.\u003c\/p\u003e\n\u003ch3\u003eProcessor and Backplane Integration\u003c\/h3\u003e\n\u003cp\u003eThe 1785-L20C receives operating power through the PLC-5 chassis system and communicates with installed I\/O modules through the backplane bus. The processor supports firmware-controlled execution and module configuration stored within the PLC-5 controller environment.\u003c\/p\u003e\n\u003cp\u003eBackplane bus communication velocity and controller scan performance depend on processor loading, installed I\/O modules, and configured communication tasks.\u003c\/p\u003e\n\u003cp\u003eThe module provides compatibility with PLC-5 system components while maintaining the original controller hardware structure.\u003c\/p\u003e\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Allen-Bradley 1785-L20C PLC-5\/20 ControlNet Processor Module\u003c\/li\u003e\n\u003cli\u003e1 x Processor module hardware assembly\u003c\/li\u003e\n\u003cli\u003e1 x Installed communication interface assembly\u003c\/li\u003e\n\u003cli\u003eUser manuals, programming software, and programming cables are not included unless specifically listed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eController Preparation\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRemove chassis power before installing or removing the processor module.\u003c\/li\u003e\n\u003cli\u003eConfirm PLC-5 chassis type and ControlNet network configuration before replacement.\u003c\/li\u003e\n\u003cli\u003eVerify firmware compatibility with the existing controller application.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eModule Installation\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAlign the processor module with the PLC-5 chassis slot connector.\u003c\/li\u003e\n\u003cli\u003eSecure the module according to the chassis mounting requirements.\u003c\/li\u003e\n\u003cli\u003eConfirm backplane connection integrity before restoring power.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNetwork Connection\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCheck ControlNet node addressing before network startup.\u003c\/li\u003e\n\u003cli\u003eUse appropriate shielded communication cabling for ControlNet connections.\u003c\/li\u003e\n\u003cli\u003eVerify communication status through controller diagnostics after power restoration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWhat function does the 1785-L20C provide in a PLC-5 system?\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe module performs PLC-5 controller processing, I\/O management, and ControlNet communication functions within compatible PLC-5 chassis systems.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHow much memory is available in the 1785-L20C?\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe processor module provides 16 K memory capacity for PLC-5 application execution and controller data storage.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDoes the 1785-L20C support ControlNet communication?\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eYes. The module includes integrated ControlNet communication capability for PLC-5 network integration.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWhat I\/O addressing method does the module support?\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe processor supports 2-slot addressing for compatible 1771 I\/O module configurations.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWhat power source does the 1785-L20C use?\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe processor operates through the PLC-5 chassis power system. System power configuration depends on the installed chassis supply.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCan digital and analog I\/O modules be used with this processor?\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eYes. The processor supports digital I\/O modules with 16\/32-point configurations and analog modules with 4\/8-channel configurations.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDoes the processor support hot swapping?\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eHot swapping is not specified for this processor module. Power removal is recommended before hardware installation changes.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWhat factors affect PLC-5 processor communication performance?\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNetwork configuration, controller scan load, installed I\/O modules, and ControlNet scheduling parameters affect communication performance.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":46066451054765,"sku":"1785-L20C","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/4_f74f1747-c58d-42e1-b272-c175c6892fa8.jpg?v=1785855171","url":"https:\/\/www.maxwellplc.com\/ru\/products\/allen-bradley-1785-l20c-plc-5-20-controlnet-processor-module-plc-5-series","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}