{"product_id":"allen-bradley-1788-fbjb6-fieldbus-6-way-junction-box","title":"Allen-Bradley 1788-FBJB6 Fieldbus 6-Way Junction Box","description":"\u003cp\u003eConfigured for field signal termination and segment distribution in process automation networks, the \u003cstrong\u003eAllen-Bradley 1788-FBJB6\u003c\/strong\u003e (\u003cstrong\u003e1788-FBJB6\u003c\/strong\u003e Fieldbus Junction Box) provides direct physical\/electrical execution.\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\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\u003eModel\u003c\/td\u003e\n\u003ctd\u003e1788-FBJB6\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\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\u003e0.75 lbs (0.34 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard DIN-rail junction box footprint\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 to 70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003ePassive bus distribution load\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage Range\u003c\/td\u003e\n\u003ctd\u003e24 to 32 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtocol Compatibility\u003c\/td\u003e\n\u003ctd\u003eFOUNDATION Fieldbus (H1) \/ PROFIBUS PA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMedia Connections\u003c\/td\u003e\n\u003ctd\u003eH1 Media Trunk In\/Out, 6 H1 Media Drops\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure Style\u003c\/td\u003e\n\u003ctd\u003eOpen Style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Format\u003c\/td\u003e\n\u003ctd\u003eDIN-rail mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eFOUNDATION Fieldbus \/ PROFIBUS PA Connectivity and Channel Isolation\u003c\/h3\u003e\n\u003cp\u003eThe 1788-FBJB6 junction box routes continuous process control data via FOUNDATION Fieldbus H1 and PROFIBUS PA network protocols across an operational voltage window of 24 to 32 VDC. Designed to interface a main H1 media trunk line with up to 6 field instrument spur drops, the internal bus bar architecture maintains deterministic packet delivery and signal integrity. Dedicated spur-to-trunk branch isolation circuits mitigate signal reflections and crosstalk, shielding the primary network loop from localized field cable short circuits.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1788-FBJB6 junction box support spur line insertion or removal while the fieldbus segment is active?\u003c\/p\u003e\n\u003cp\u003eA: Yes. Live fieldbus spurs can be connected or disconnected without interrupting continuous communication across the main H1 trunk line or affecting operational field instruments on remaining spurs.\u003c\/p\u003e\n\u003cp\u003eQ: How does the 1788-FBJB6 junction box manage trunk line termination?\u003c\/p\u003e\n\u003cp\u003eA: The module accommodates standard external fieldbus terminators across its trunk output terminals to satisfy segment impedance matching requirements for PROFIBUS PA and FOUNDATION Fieldbus layouts.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eSnap the 1788-FBJB6 junction box securely onto a standard 35 mm DIN rail inside a protective field enclosure.\u003c\/li\u003e\n\u003cli\u003eConnect the primary fieldbus trunk-in and trunk-out cables to the main H1 terminal blocks, applying proper shielding practices.\u003c\/li\u003e\n\u003cli\u003eWire field instruments to the 6 dedicated H1 drop spur terminals using twisted-shielded fieldbus cable pairs.\u003c\/li\u003e\n\u003cli\u003eVerify that total spur lengths and segment power consumption conform to standard FOUNDATION Fieldbus or PROFIBUS PA distance and voltage drop limits.\u003c\/li\u003e\n\u003cli\u003eGround all cable shield drains at a single point according to system engineering specifications to prevent ground loops.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":48761548472510,"sku":"1788-FBJB6","price":83.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/1788-FBJB6.png?v=1787197730","url":"https:\/\/www.autooiltech.com\/products\/allen-bradley-1788-fbjb6-fieldbus-6-way-junction-box","provider":"AutoOilTech Limited","version":"1.0","type":"link"}