{"product_id":"allen-bradley-1785-ka3-communication-adapter-module","title":"Allen-Bradley 1785-KA3 Communication Adapter Module","description":"\u003cp\u003eThe Allen-Bradley \u003cstrong\u003e1785-KA3\u003c\/strong\u003e is a PLC-2 family communication adapter interface module that links PLC-2 series programmable controllers to a Data Highway Plus (DH+) network. Installed in any slot (except the leftmost slot) of a standard 1771 I\/O chassis, it enables data exchange, programming, and monitoring across industrial networks. The module draws 1.2 A at 5 VDC from the backplane and requires no external power supply.\u003c\/p\u003e\n\u003ch3\u003eNetwork Connections and Interfaces\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e1785-KA3\u003c\/strong\u003e features dedicated interface ports that support Data Highway, Data Highway Plus, and 1784 Series Industrial Terminals (such as the 1784-T50 workstation). When installed alongside a compatible PLC-5 system, it connects directly to Channel 3 of the PLC-5 processor. Up to four \u003cstrong\u003e1785-KA3\u003c\/strong\u003e modules can be deployed per system to expand multi-node network architectures.\u003c\/p\u003e\n\u003ch3\u003eHardware Configuration and Backplane Keying\u003c\/h3\u003e\n\u003cp\u003eModule operation and network node identification are configured using three onboard switch assemblies: the DH+ baud rate assembly, the write options assembly, and the node address group switch. To ensure proper physical alignment and prevent incorrect slot placement, the module is keyed to the 1771 backplane connector between pins 4 and 6, and pins 22 and 24 of the upper connector. Front-panel status LEDs provide independent diagnostic monitoring for each communication channel.\u003c\/p\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\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\u003eModel\u003c\/td\u003e\n\u003ctd\u003e1785-KA3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eCommunication Adapter Interface Modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003ePLC-2 \/ PLC-5 Compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface Ports\u003c\/td\u003e\n\u003ctd\u003eData Highway, Data Highway Plus (DH+), 1784 Industrial Terminal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePLC-5 Processor Connection\u003c\/td\u003e\n\u003ctd\u003eDirect Connection to Channel 3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Power Requirement\u003c\/td\u003e\n\u003ctd\u003e1.2 A at 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired External Power\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Modules Per System\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWiring Arm\u003c\/td\u003e\n\u003ctd\u003e1771-WN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating\u003c\/td\u003e\n\u003ctd\u003eConformal coat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C (32 to 140 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 to 85 deg C (-40 to 185 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelative Humidity\u003c\/td\u003e\n\u003ctd\u003e5% to 95% non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.85 kg (1.88 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003cp\u003eFrequently Asked Questions\u003c\/p\u003e\n\u003cp\u003eQ: Where should the \u003cstrong\u003e1785-KA3\u003c\/strong\u003e module be installed within the 1771 I\/O chassis?\u003c\/p\u003e\n\u003cp\u003eA: The module can be installed in any available slot of the 1771 I\/O chassis except the furthest left slot, which is reserved for the primary processor or adapter.\u003c\/p\u003e\n\u003cp\u003eQ: How is the node address and network communication configured on the \u003cstrong\u003e1785-KA3\u003c\/strong\u003e?\u003c\/p\u003e\n\u003cp\u003eA: Communication settings are established using three onboard DIP switch assemblies: the DH+ baud rate switch assembly, the write options switch assembly, and the node address group switch assembly.\u003c\/p\u003e\n\u003cp\u003eQ: How is the \u003cstrong\u003e1785-KA3\u003c\/strong\u003e keyed to prevent incorrect insertion into the backplane?\u003c\/p\u003e\n\u003cp\u003eA: Keying positioning bands must be placed between pins 4 and 6, and pins 22 and 24 of the top backplane connector.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":53214135189784,"sku":"1785-KA3","price":270.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/3483\/3688\/files\/1785-KA5_Cocoai_41fe682b-8bfc-4d34-a913-7217074b04cb.jpg?v=1794278502","url":"https:\/\/www.innoplcsync.com\/products\/allen-bradley-1785-ka3-communication-adapter-module","provider":"InnoPLC Sync Co., Ltd.","version":"1.0","type":"link"}