{"product_id":"allen-bradley-1797-ob4d-digital-output-modules","title":"Allen-Bradley 1797-OB4D Digital Output Modules","description":"\u003cp\u003eConfigured for discrete actuator driving and field loop switching in hazardous location FLEX Ex platforms, the \u003cstrong\u003eAllen-Bradley 1797-OB4D\u003c\/strong\u003e (\u003cstrong\u003e1797-OB4D\u003c\/strong\u003e FLEX Ex Digital Output Module) 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\u003e1797-OB4D\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\u003e0.60 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard FLEX Ex module footprint\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-20 deg C to 70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e24 VDC backplane bus power\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Count\u003c\/td\u003e\n\u003ctd\u003e4 non-isolated sourcing outputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal Interface\u003c\/td\u003e\n\u003ctd\u003e16-pin terminal base interface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCircuit Protection\u003c\/td\u003e\n\u003ctd\u003eShort-circuit and open-load diagnostics\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Platform\u003c\/td\u003e\n\u003ctd\u003eFLEX Ex (1797 Series)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eDeterministic Network Backplane and Interface Performance\u003c\/h3\u003e\n\u003cp\u003eDesigned to interface directly with intrinsically safe solenoid valves and indicator loops, the module executes discrete logic commands received over the FLEX Ex backplane bus. High-speed optocoupler arrays isolate internal bus logic from field circuit transients, while onboard current-limiting components ensure safe energy levels during field line faults. Internal diagnostic detection logic continuously samples channel continuity, logging open-load or short-circuit fault states to upper-level controller memory tags without introducing backplane latency.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1797-OB4D require a dedicated terminal base for field wiring connections?\u003c\/p\u003e\n\u003cp\u003eA: Yes, the module plugs into a compatible 16-pin FLEX Ex terminal base assembly, allowing live insertion and removal of the active module card without disconnecting field wiring.\u003c\/p\u003e\n\u003cp\u003eQ: How does the module handle output short-circuit conditions on a field channel?\u003c\/p\u003e\n\u003cp\u003eA: Upon detecting an overcurrent condition, the affected channel automatically limits current flow and sets a diagnostic fault bit on the backplane bus while maintaining execution on remaining channels.\u003c\/p\u003e\n\u003cp\u003eQ: Can non-IS standard FLEX I\/O power supplies be used with the 1797-OB4D module?\u003c\/p\u003e\n\u003cp\u003eA: No, the 1797-OB4D must strictly draw system power from a certified FLEX Ex power supply module (such as the 1797-PS series) to maintain intrinsic safety ratings.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eAlign the module card with the card guides of the 16-pin FLEX Ex terminal base and press firmly until the locking latch engages fully. Ensure field wiring conductors are routed through intrinsically safe wireways, maintaining a minimum physical separation of 50 mm from non-intrinsically safe AC or DC power cables. Connect the terminal base shield ground connector directly to the panel earth bus bar using a low-impedance copper strap to prevent electromagnetic interference from degrading diagnostic detection accuracy.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52783462482200,"sku":"1797-OB4D","price":270.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0892\/3483\/3688\/files\/1797-IBN16_Cocoai.jpg?v=1790583959","url":"https:\/\/www.innoplcsync.com\/products\/allen-bradley-1797-ob4d-digital-output-modules","provider":"InnoPLC Sync Co., Ltd.","version":"1.0","type":"link"}