{"product_id":"allen-bradley-1771-dcm-plc-5-direct-communication-module","title":"Allen-Bradley 1771-DCM PLC-5 Direct Communication Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAllen-Bradley 1771-DCM\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efunctions as a high-speed Direct Communication Module (DCM) within the legacy PLC-5 Universal I\/O platform. It establishes a robust link between PLC-5 processors and Remote I\/O (RIO) networks, enabling peer-to-peer data exchange across distributed architectures. This module supports both discrete and block transfer modes to accommodate various data densities and timing requirements. We supply this unit as\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New and Original\u003c\/strong\u003e, featuring a factory-applied conformal coating to ensure long-term electronic integrity in aggressive industrial atmospheres.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eThe 1771-DCM optimizes data throughput between the local chassis backplane and remote stations using the industry-standard RIO protocol.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturer:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAllen-Bradley \/ Rockwell Automation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Line:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ePLC-5 (1771 I\/O)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eModule Type:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDirect Communication Module (DCM)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSupported Protocol:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eRemote I\/O (RIO)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTransmission Rates:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e57.6K baud @ 10,000 ft; 115.2K baud @ 5,000 ft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCommunication Modes:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eDiscrete Data Transfer (7+1 words); Block Transfer (63+1 words)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eBackplane Current:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e1.2 Amperes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eModule Scan Time:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e1.3 to 5 ms\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eResponse Time:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e15 ms\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWiring Arm:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e1771-WN\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eEnvironmental Protection:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eConformal Coated\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e32 to 131°F (0 to 55°C)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eStorage Temperature:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e-40 to 185°F (-40 to 85°C)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eExtended Network Range:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 1771-DCM manages reliable communications over vast distances, reaching up to 10,000 feet at 57.6K baud. This capability allows for the integration of remote machine cells without requiring expensive signal repeaters.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDual Data Transfer Logic:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module processes both Discrete Data and Block Transfers simultaneously. Engineers utilize Discrete Transfer for high-speed bit-level interlocking (up to 7 words) and Block Transfer for larger data arrays (up to 63 words), such as recipe parameters or diagnostic buffers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eResilience in Harsh Conditions:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFactory conformal coating protects the internal circuitry from conductive dust, humidity, and chemical vapors. This prevents parasitic leakage and dendritic growth, common failure points in pulp and paper mills or chemical refineries.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eStreamlined Integration:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 1771-DCM uses the standard 1771-WN wiring arm, which simplifies field wiring for the Belden 9463 \"Blue Hose\" cable. The mechanical keying (between pins 2-14 and 16-18) prevents the accidental insertion of incorrect modules, protecting the system from electrical mismatch.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat cable type does the 1771-DCM require for networking?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module requires Belden 9463 twinaxial cable (commonly known as \"Blue Hose\") or an equivalent shielded twinax cable to maintain signal integrity and noise immunity over long distances.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this module support programming in C or BASIC?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 1771-DCM supports operations for both BASIC and C programs, providing developers with high-level language flexibility for complex data manipulation or specialized communication routines.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the module communicate with the main PLC-5 processor?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module communicates via Block-Transfer instructions. The PLC-5 processor executes a Block Transfer Write (BTW) to send data to the DCM and a Block Transfer Read (BTR) to retrieve status and data from the DCM.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIs this a refurbished or surplus unit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAbsolutely not. We guarantee this 1771-DCM is\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100% Brand New and Original\u003c\/strong\u003e. It comes in factory packaging, ensuring the conformal coating and internal components remain in pristine condition for immediate deployment.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52589872349493,"sku":"1771-DCM","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/1771-DCM.jpg?v=1776412725","url":"https:\/\/www.5gplc.com\/products\/allen-bradley-1771-dcm-plc-5-direct-communication-module","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}