{"product_id":"allen-bradley-1797-ob4d-flex-ex-i-o-24v-dc-4-non-isolated-source-output-module","title":"Allen-Bradley 1797-OB4D FLEX Ex I\/O 24V DC 4 Non-Isolated Source Output Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAllen-Bradley 1797-OB4D\u003c\/strong\u003e is a high-performance, intrinsically safe digital output module designed for hazardous area industrial environments. As part of the \u003cstrong\u003eFLEX Ex I\/O\u003c\/strong\u003e product family, this module provides 4 non-isolated, sourcing outputs specifically engineered to operate digital field devices such as valves, audible alarms, and solenoids.\u003c\/p\u003e\n\u003cp\u003eThe module features an integrated \u003cstrong\u003eFlexBus\u003c\/strong\u003e communication interface which communicates seamlessly through compatible adapters like the ControlNet Ex adapter (1797-ACNR15) to achieve a robust, two-tier fault state mechanism across the backplane. This product is supplied as open-type equipment and must be installed on a \u003cstrong\u003e1797-TB3\u003c\/strong\u003e or \u003cstrong\u003e1797-TB3S\u003c\/strong\u003e intrinsically safe terminal base unit inside a suitable enclosure , ensuring maximum system safety and environmental isolation.\u003c\/p\u003e\n\u003cp\u003eThe electrical architecture incorporates diagnostic indicators and sophisticated software configuration profiles accessible via RSLogix 5000. Every sourcing channel is electrically connected to one another and includes advanced electronic protection alongside selectable alarm filtering , making it an ideal choice for petro-chemical, chemical, gas, and automated process industries operating in Zone 1, Zone 2, or Zone 22 classifications.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBuilt with 4 non-isolated, sourcing intrinsically safe digital outputs.\u003c\/li\u003e\n\u003cli\u003eDesigned for hot-swapping, allowing safe removal and insertion under power in nonhazardous conditions.\u003c\/li\u003e\n\u003cli\u003eComprehensive individual channel diagnostic capabilities including wire-off fault and overload detection.\u003c\/li\u003e\n\u003cli\u003eIntegrated software-configurable 100 Hz (10 ms) filter and adjustable alarm filter time constants (0.25 ms to 32 ms).\u003c\/li\u003e\n\u003cli\u003eSelectable output fault behaviors allowing channels to either reset to zero or hold the last valid state.\u003c\/li\u003e\n\u003cli\u003eClear physical diagnostics featuring 4 yellow status indicators, 4 red fault indicators, and 1 green module power indicator.\u003c\/li\u003e\n\u003cli\u003eBuilt-in electronic protection covering lead break, overload conditions, and short circuits.\u003c\/li\u003e\n\u003cli\u003eSolid-state design utilizing standard FlexBus backplane connectivity with negligible internal inductance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAutomated control of intrinsically safe pneumatic and hydraulic control valves.\u003c\/li\u003e\n\u003cli\u003eControl and triggering of field-mounted audible alarms and visual beacons in explosive areas.\u003c\/li\u003e\n\u003cli\u003eActuation of low-power solenoids and relay coils within hazardous gas or dust atmospheres.\u003c\/li\u003e\n\u003cli\u003eProcess automation deployment in chemical processing plants, oil refineries, and gas upstream facilities.\u003c\/li\u003e\n\u003cli\u003eSafe signal handling in grain handling or powder processing environments matching Zone 22 dust criteria.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eAttribute\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eValue\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley \/ Rockwell Automation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1797-0B4D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Series\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFLEX Ex I\/O\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNumber of Outputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4, nonisolated, sourcing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIS Output Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEx ia IIB\/IIC T4, AEx ia IIC T4, Class I, II, III Division 1 Groups A, B, C, D, E, F, G T4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIS Module Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEx ib IIB\/IIC T4, AEx ib IIC T4, Class I Division 1 Groups A...D T4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLoad Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30...5000 Ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFault Detection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFault bits in data table and LED (per channel) blinking red (1 Hz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eElectronic Protection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLead break, overload, short circuit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum Output Delay Times (OFF to ON)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;1.2 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum Output Delay Times (ON to OFF)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;1.2 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIndicators\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 yellow status indicators, 4 red fault indicators, 1 green module power indicator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput (Intrinsically Safe) Parameters\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUi \u0026lt; 5.8V DC, Ii \u0026lt; 400 mA, Li = Negligible, Ci \u0026lt; 1.35 uF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Supply Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e+V, -V Intrinsically safe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Supply Parameters\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUi \u0026lt; 9.5V DC, Ii \u0026lt; 1 A, Li = Negligible, Ci = Negligible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModule Field-Side Power Consumption\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7.5 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Dissipation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThermal Dissipation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e17.07 BTU\/hr\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModule Location\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1797-TB3 or 1797-TB3S Terminal base unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConductors Wire Size, Max\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 mm2 (12 gauge) stranded with 1.2 mm (3\/64 in.) insulation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eKeyswitch Position\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePosition 7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-20...+70 degC (-4...+158 degF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStorage Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-40...+85 degC (-40...+185 degF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelative Humidity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5...95% noncondensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating \/ Nonoperating Shock\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTested to 15 g peak acceleration, 11(+1) ms pulse width\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVibration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTested 2 g @ 10...500 Hz per IEC68-2-6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions (H x W x D)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e46 x 94 x 75 mm (1.8 x 3.7 x 2.95 in.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 200 g (7.05 oz.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eConnections\/Interfaces\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eTerminal Pin\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eFunction\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRow A - Terminal 0\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOutput 0 Channel (+) Connection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRow A - Terminal 1\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOutput 0 Channel (-) Connection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRow A - Terminal 4\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOutput 1 Channel (+) Connection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRow A - Terminal 5\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOutput 1 Channel (-) Connection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRow A - Terminal 8\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOutput 2 Channel (+) Connection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRow A - Terminal 9\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOutput 2 Channel (-) Connection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRow A - Terminal 12\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOutput 3 Channel (+) Connection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRow A - Terminal 13\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOutput 3 Channel (-) Connection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRow C - Terminal 34\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e+V DC Intrinsically Safe Power Input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRow C - Terminal 35\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-V DC Intrinsically Safe Power Common Input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRow C - Terminal 50\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e+V DC Power Daisy-Chain Extension Terminal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRow C - Terminal 51\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-V DC Power Common Daisy-Chain Extension Terminal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003cp\u003eNote: Terminals 2, 3, 6, 7, 10, 11, 14, 15, 17 to 32, 36, 37, 38, 39, 46, 47, 48, and 49 are unused and no connections are permitted. Do not use unused terminals as supporting terminals to avoid system damage.\u003c\/p\u003e\n\u003ch3\u003eInstallationGuidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnclosure Specifications\u003c\/strong\u003e: The module must be installed within a suitably rated metal enclosure when used in Zone 1 to protect it from environmental exposure, as the module itself holds an IP20 factor rating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZone 22 Cabinet Selection\u003c\/strong\u003e: For installation within Zone 22 dust environments, specific certified cabinet models must be utilized: IVK-ISRPI-V16LC, IVK-ISRPI-V8HYW, or IVK-ISRPI-V8LC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKeyswitch Alignment\u003c\/strong\u003e: Before mounting the module, rotate the keyswitch on the terminal base unit clockwise to position 7. Do not alter this keyswitch setting once wiring configuration is finished.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexBus Setup\u003c\/strong\u003e: Ensure that the FlexBus connector is pushed completely to the left toward the neighboring base unit or adapter before trying to insert the module; execution is blocked unless fully extended.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePin Alignment and Seating\u003c\/strong\u003e: Verify all bottom connection pins are straight, align the module's alignment bar with the alignment groove on the base, and press down firmly until the latching mechanism securely locks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntrinsically Safe Separation\u003c\/strong\u003e: Only join intrinsically safe terminal bases to other intrinsically safe system modules\/adapters to secure backplane integrity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShielding and Grounding\u003c\/strong\u003e: All I\/O wiring must use high-quality shielded wire. All wire shields must be terminated strictly external to the module using dedicated bus bars or shield-terminating feed-through points.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrostatic Prevention\u003c\/strong\u003e: The entire system must be protected against electrostatic charges. Install a highly visible warning sign in immediate proximity stating: \"WARNING Avoid electrostatic charging\".\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Restrictions\u003c\/strong\u003e: The system must be powered exclusively by an intrinsically safe power supply. Never allow nonintrinsically safe signals to be applied to the module, as doing so permanently invalidates its intrinsic safety status.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLive Insertion Rules\u003c\/strong\u003e: Although the module supports removal and insertion under power, an electrical arc can occur if the underlying terminal base is unseated or wired while field power is live, posing an explosion risk in hazardous areas. Ensure power is fully isolated or that the environment is verified nonhazardous before handling.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eComplianceandCertifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCENELEC\u003c\/strong\u003e: II (1) 2G Ex ib[ia] IIC T4, II (1) D [Ex iaD]\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUL, C-UL\u003c\/strong\u003e: Certified for Class I, Groups A, B, C, D; Class II, Groups E, F, G; Class III Hazardous Locations; Class I, Zone 1, AEx ib[ia] IIC T4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFM\u003c\/strong\u003e: Intrinsically Safe Class I, Div 1, Groups A, B, C, D, T4; Associated Apparatus with intrinsically safe connections Class I, II, III, Div 1, Groups A-G; Class I, Zone 1, AEx ib[ia] IIC T4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eINMETRO\u003c\/strong\u003e: BR-Ex ia\/ib BB\/IIC T4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIECEx\u003c\/strong\u003e: [Zone 0] Ex ib[ia] IIC T4 [Ex iaD] (Reference Certificate: IECEx BVS 09.0024X)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eATEX\u003c\/strong\u003e: Reference Certificate Number DMT 02 ATEX E 040 X complying with EN 60079-0, EN 60079-11, and EN 61241 series\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCE Mark Directives\u003c\/strong\u003e: Approved for installation within the EU and EEA regions under EMC Directive 2014\/30\/EU applying EN 61000-6-4:2007, EN 61000-6-2:2005, and EN 61326-1:2013\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat terminal bases are compatible with the 1797-OB4D module?\u003c\/strong\u003e \u003c\/p\u003e\n\u003cp\u003eThe module must be used exclusively with the 1797-TB3 or 1797-TB3S intrinsically safe terminal base units.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does a solid red status LED indicate on the front panel?\u003c\/strong\u003e \u003c\/p\u003e\n\u003cp\u003eA solid red indicator means the module did not pass its power-up check routine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this module be repaired if a single channel fails?\u003c\/strong\u003e \u003c\/p\u003e\n\u003cp\u003eNo, this module is not field-repairable. Attempting to open the enclosure voids the factory warranty and its intrinsic safety certifications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the default operation state of the outputs upon initial power-up?\u003c\/strong\u003e \u003c\/p\u003e\n\u003cp\u003eAt system power-up, the Output Enable bit is default set to 0, which keeps all outputs forced off until initialized to 1 via the application program.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat range of field load resistance is supported for normal operation?\u003c\/strong\u003e \u003c\/p\u003e\n\u003cp\u003eThe normal load range per channel is defined as 30 to 5000 Ohm.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the module signal a wire-off or channel overload fault?\u003c\/strong\u003e \u003c\/p\u003e\n\u003cp\u003eFaults are signaled via the internal data table fault bits and by the corresponding channel LED flashing red at a 1 Hz frequency.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it safe to use this module with standard non-intrinsically safe signals?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e No, you must never apply non-intrinsically safe signals. The module cannot be reused in an intrinsically safe environment once exposed to non-intrinsically safe signals.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat happens if I wire field devices to the unused terminals of the base?\u003c\/strong\u003e \u003c\/p\u003e\n\u003cp\u003eUsing unused terminals as supporting terminals can cause severe physical damage to the module, unintended system operations, or both.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the maximum signal propagation delay time for channel state changes?\u003c\/strong\u003e \u003c\/p\u003e\n\u003cp\u003eThe maximum output delay time for both OFF-to-ON and ON-to-OFF transitions is less than 1.2 ms.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre the output channels isolated from each other?\u003c\/strong\u003e \u003c\/p\u003e\n\u003cp\u003eNo, the channels in this module are non-isolated and are electrically connected to each other.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan this module be inserted into a live terminal base while the backplane is powered?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e Yes, it is designed for hot-swapping, but field-side power must be removed or the area verified nonhazardous to avoid an explosion from an electrical arc.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the purpose of the Latch Alarms configuration parameter?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e It dictates whether a wire-off or overload fault bit remains locked until manually cleared by a Reset Alarms transition, ensuring short-duration faults are captured.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat threshold guarantees a wire-off fault is reported?\u003c\/strong\u003e \u003c\/p\u003e\n\u003cp\u003eA wire-off condition is guaranteed to be flagged and reported for field loads greater than 75 kOhm, regardless of output state.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow are the fault alarm filters configured in software?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Alarm Filter bits allow setting the time constant across a range of binary options: 0.25 ms, 0.5 ms, 1 ms, 2 ms, 4 ms, 8 ms, 16 ms, or 32 ms.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":52695186276715,"sku":"1797-OB4D","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/allen-bradley-1797-ob4d-flex-ex-output-module-ypckzr4pmqv_a421cd76-3e00-41b5-8d36-58b761919b51.jpg?v=1766114473","url":"https:\/\/www.plcprotech.com\/products\/allen-bradley-1797-ob4d-flex-ex-i-o-24v-dc-4-non-isolated-source-output-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}