{"product_id":"1734-ob8-allen-bradley-1734-point-i-o-output-module","title":"1734-OB8 Allen-Bradley 1734 POINT I\/O Output Module","description":"\u003ch3\u003e\u003cstrong\u003eAllen-Bradley 1734-OB8 | Eight-Point DC Output for Distributed Control\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1734-OB8\u003c\/strong\u003e is an eight-channel digital output module in the \u003cstrong\u003ePOINT I\/O 1734 series\u003c\/strong\u003e. It provides discrete DC control signals for distributed automation architectures, allowing a controller to operate compatible field devices through a compact I\/O platform.\u003c\/p\u003e\n\n\u003cp\u003eFor system integrators and maintenance engineers, selection should focus on more than the nominal 24V DC supply. Verify the load's operating current, channel grouping, total module current, inrush demand, and output behavior during controller startup or communication loss before commissioning.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003e01 | Output Capability at a Glance\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct family\u003c\/td\u003e\n\u003ctd\u003ePOINT I\/O 1734 series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e1734-OB8\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule type\u003c\/td\u003e\n\u003ctd\u003e8-point DC digital output module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal on-state voltage\u003c\/td\u003e\n\u003ctd\u003e24V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOn-state voltage range\u003c\/td\u003e\n\u003ctd\u003e10–28.8V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum on-state voltage drop\u003c\/td\u003e\n\u003ctd\u003e0.2V DC (provided specification; confirm against the applicable manual)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum on-state current\u003c\/td\u003e\n\u003ctd\u003e1.0mA per channel (provided specification; confirm against the applicable manual)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum off-state leakage\u003c\/td\u003e\n\u003ctd\u003e0.5mA at 28.8V DC (provided specification; confirm against the applicable manual)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput current rating\u003c\/td\u003e\n\u003ctd\u003eProvided data states 1.0A per output and 2.0A maximum; verify channel-group and module limits before use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurge current\u003c\/td\u003e\n\u003ctd\u003eProvided data states 2A for 10ms, repeatable every 3 seconds; verify permitted conditions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput signal delay\u003c\/td\u003e\n\u003ctd\u003eProvided data states a maximum of 0.1ms; verify the official timing specification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIndicators\u003c\/td\u003e\n\u003ctd\u003e8 yellow output-status indicators and 2 green\/red module\/network indicators, as provided\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation voltage\u003c\/td\u003e\n\u003ctd\u003eProvided data states 50V continuous; verify the applicable isolation rating and test conditions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eListed weight\u003c\/td\u003e\n\u003ctd\u003e0.31lb (approximately 0.14kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e10612598310279 (as provided; verify before catalog publication)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003e\u003cstrong\u003e02 | Load Matching: Check the Circuit Before Wiring\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eA digital output must match the electrical characteristics of its connected load. A nominal 24V DC rating alone does not establish compatibility with every relay, solenoid, indicator, or electronic input.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterposing relays:\u003c\/strong\u003e Check the relay coil's pickup current, steady-state current, and suppression requirements. Confirm that the output can switch the coil reliably without exceeding its permitted load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolenoid valves:\u003c\/strong\u003e Evaluate coil inrush, continuous current, switching frequency, and inductive-energy suppression. Use a suitable interface device when the load exceeds the module's verified rating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContactors:\u003c\/strong\u003e Confirm the coil's DC rating and switching characteristics. Do not assume that a contactor coil is compatible solely because its label specifies 24V DC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal lamps and electronic loads:\u003c\/strong\u003e Check startup current and minimum load requirements. Low-current loads may behave unexpectedly if their electrical characteristics interact with off-state leakage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePLC interface circuits:\u003c\/strong\u003e Verify the receiving device's input polarity, common reference, and voltage thresholds before connecting outputs to another controller or interface module.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eEngineering note:\u003c\/strong\u003e Calculate the simultaneous load current under the intended operating condition. Keep the design within the module's verified channel, group, and overall current limits, including startup transients.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003e03 | Where the Module Fits in an Automation System\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eThe \u003cstrong\u003e1734-OB8\u003c\/strong\u003e can be considered for distributed control applications that require discrete DC switching. Final suitability depends on the complete POINT I\/O assembly, controller architecture, power arrangement, wiring accessories, and load specifications.\u003c\/p\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eEquipment or application\u003c\/th\u003e\n\u003cth\u003eTypical control task\u003c\/th\u003e\n\u003cth\u003ePre-installation check\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackaging machinery\u003c\/td\u003e\n\u003ctd\u003eSwitching compatible indicators, relays, and discrete actuators\u003c\/td\u003e\n\u003ctd\u003eConfirm cycle frequency and simultaneous output demand\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConveyor systems\u003c\/td\u003e\n\u003ctd\u003eControlling interface relays and selected DC control devices\u003c\/td\u003e\n\u003ctd\u003eCheck startup sequences and output behavior during faults\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial-handling equipment\u003c\/td\u003e\n\u003ctd\u003eOperating compatible solenoid and relay circuits\u003c\/td\u003e\n\u003ctd\u003eVerify coil suppression and total current requirements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcess skids\u003c\/td\u003e\n\u003ctd\u003eDriving discrete control interfaces for auxiliary equipment\u003c\/td\u003e\n\u003ctd\u003eReview cabinet temperature, power quality, and grounding\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMachine control panels\u003c\/td\u003e\n\u003ctd\u003eSwitching pilot devices and downstream control interfaces\u003c\/td\u003e\n\u003ctd\u003eConfirm terminal accessories, wiring diagrams, and load polarity\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDistributed I\/O stations\u003c\/td\u003e\n\u003ctd\u003eProviding discrete outputs near field equipment\u003c\/td\u003e\n\u003ctd\u003eVerify network configuration and module compatibility\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eThis module should not be treated as a direct replacement for a safety-rated output or a dedicated motor power stage. Applications involving safety functions, large inductive loads, or high starting currents require the appropriate certified or rated interface equipment.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003e04 | Installation and Commissioning Sequence\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfirm the assembly:\u003c\/strong\u003e Check the catalog number, POINT I\/O adapter, mounting base, terminal arrangement, and installation documentation. Do not assume that a matching series number guarantees compatibility with every accessory.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolate the power:\u003c\/strong\u003e Apply the site's lockout\/tagout procedure and verify the absence of hazardous voltage before wiring or replacing the module.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInspect field wiring:\u003c\/strong\u003e Confirm the 24V DC supply, polarity, common connections, conductor condition, and terminal tightness against the applicable wiring diagram.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReview load demand:\u003c\/strong\u003e Measure or obtain the load's steady-state and inrush current. Check the verified channel and group limits before connecting multiple loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValidate controller configuration:\u003c\/strong\u003e Confirm the correct module identity, I\/O mapping, controller program, and network configuration where applicable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest outputs individually:\u003c\/strong\u003e Command each channel under controlled conditions. Compare the software command, indicator state, terminal voltage, and actual field-device response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest abnormal conditions:\u003c\/strong\u003e Where the risk assessment permits, verify recovery behavior after a communication interruption, power cycle, or controller fault. Confirm the configured fault-state behavior rather than assuming outputs always turn off.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003e\u003cstrong\u003e05 | Field Diagnostics: Separate Logic, Wiring, and Load Faults\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eWhen a field device does not respond, use a structured diagnostic sequence instead of replacing the output module immediately. The indicator state provides useful evidence, but it does not independently prove that the load circuit works correctly.\u003c\/p\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eObserved symptom\u003c\/th\u003e\n\u003cth\u003ePossible cause\u003c\/th\u003e\n\u003cth\u003eRecommended diagnostic action\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput command is ON, but the device remains inactive\u003c\/td\u003e\n\u003ctd\u003eOpen field wiring, missing load supply, incorrect polarity, defective load, or an output-channel problem\u003c\/td\u003e\n\u003ctd\u003eMeasure the output circuit under the actual load condition and inspect the wiring path\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput indicator remains OFF despite an ON command\u003c\/td\u003e\n\u003ctd\u003eIncorrect I\/O mapping, controller logic conditions, configuration issues, or a module fault\u003c\/td\u003e\n\u003ctd\u003eCompare the controller tag, commanded state, module status, and configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLoad activates intermittently\u003c\/td\u003e\n\u003ctd\u003eLoose terminals, unstable supply voltage, excessive inrush, or an intermittent field device\u003c\/td\u003e\n\u003ctd\u003eInspect terminals and record supply voltage during switching; compare with load specifications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLoad remains energized after the command turns OFF\u003c\/td\u003e\n\u003ctd\u003eIncorrect wiring, an external backfeed path, a failed output device, or load-specific behavior\u003c\/td\u003e\n\u003ctd\u003eIsolate the circuit safely and measure voltage with the load disconnected where appropriate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMultiple channels fail at the same time\u003c\/td\u003e\n\u003ctd\u003eShared supply or common wiring problems, group-current overload, or a module-level issue\u003c\/td\u003e\n\u003ctd\u003eCheck shared power distribution, common connections, load totals, and module diagnostics\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProblems occur during startup or simultaneous switching\u003c\/td\u003e\n\u003ctd\u003eTransient current demand, supply dip, or a mismatch between actual and permitted load conditions\u003c\/td\u003e\n\u003ctd\u003eMeasure startup current and supply voltage; compare the results with verified module limits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eDiagnostic caution:\u003c\/strong\u003e Follow the product manual's LED definitions and fault-handling instructions. Do not interpret an indicator color as a specific fault code without confirming its meaning for the installed hardware and firmware.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003e06 | Maintenance and Reliability Considerations\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003eRecord the module catalog number and the connected load list in the cabinet documentation.\u003c\/li\u003e\n\u003cli\u003eInspect terminals, conductors, and field-device connections during scheduled maintenance, following site isolation procedures.\u003c\/li\u003e\n\u003cli\u003eReview current demand after adding actuators or changing a machine sequence. A previously acceptable load group may exceed its limits after an upgrade.\u003c\/li\u003e\n\u003cli\u003eInvestigate repeated channel failures by checking inductive suppression, short circuits, load inrush, and power quality before installing a replacement.\u003c\/li\u003e\n\u003cli\u003eKeep a verified spare available when unplanned downtime carries a high production cost. Confirm the complete assembly and configuration requirements before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003e07 | Global PLC Spare HUB's Insight\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003eFor maintenance teams, the key selection issue is not simply whether a module supports 24V DC. The more important question is whether its verified output limits match the actual field load and the installation's operating conditions.\u003c\/p\u003e\n\n\u003cp\u003eBefore purchasing the \u003cstrong\u003e1734-OB8\u003c\/strong\u003e, compare the existing module's full catalog number, installed POINT I\/O hardware, wiring arrangement, controller configuration, and load requirements. If the module operates solenoid valves or relay coils, document both steady-state and startup current, along with the suppression method.\u003c\/p\u003e\n\n\u003cp\u003eWhen diagnosing a suspected failure, compare the output command with the module indicator, terminal voltage, and field-device response. This approach helps distinguish controller logic issues from supply, wiring, load, and channel faults, reducing unnecessary component replacement.\u003c\/p\u003e\n\n\u003cp\u003eGlobal PLC Spare HUB can help buyers review the requested model and clarify purchasing details. Confirm the exact catalog number, condition, availability, and delivery arrangements before placing an order.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003e08 | Ordering, Warranty, and Shipping\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct:\u003c\/strong\u003e Allen-Bradley POINT I\/O DC output module\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e 1734-OB8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 12-month warranty, subject to the seller's written warranty terms and coverage conditions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping options:\u003c\/strong\u003e FedEx, UPS, or DHL, subject to destination, service availability, and order arrangements\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStock and lead time:\u003c\/strong\u003e Confirm current availability and dispatch timing when requesting a quotation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBefore ordering:\u003c\/strong\u003e Provide the full catalog number and any relevant photos or nameplate details to help verify the requested item\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003e09 | Packaging and Supply Checklist\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e1734-OB8 output module, according to the confirmed order\u003c\/li\u003e\n\u003cli\u003ePackaging as specified in the quotation or order confirmation\u003c\/li\u003e\n\u003cli\u003eApplicable product identification and shipping documentation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eMounting bases, adapters, terminal accessories, cables, and other POINT I\/O components should be confirmed separately. Do not assume that accessories are included unless the quotation explicitly lists them.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003e10 | Professional FAQs\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ1: What should I verify before replacing an installed 1734-OB8 with a spare?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eCompare the full catalog number, installed base and adapter, wiring layout, controller configuration, and load requirements. During maintenance, record the existing wiring and configuration before removal. Confirm the replacement's compatibility against the applicable Rockwell Automation documentation rather than relying on appearance alone.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ2: How can I tell whether a failed output channel or a field device causes the problem?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eFirst confirm that the controller issues the intended command. Then compare the output indicator, supply voltage, terminal measurements, and field-device response. If the command and indicator agree but the load does not operate, inspect the field circuit and load. Perform electrical tests using approved procedures and appropriate instruments.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ3: Is the module suitable for switching a 24V DC solenoid valve directly?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eNot every 24V DC solenoid is a suitable direct load. Check the coil's steady-state current, inrush demand, inductive characteristics, switching frequency, and required suppression. Compare these values with the official module ratings and applicable channel-group limits. Use an appropriately rated interposing interface if the load exceeds those limits.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ4: What information helps identify the correct spare when the original module label is damaged?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eCollect clear photos of the remaining label, the POINT I\/O station, the mounting base, terminal wiring, and the controller's module configuration. Record the adapter model and any available inventory records. Ask the supplier to verify the identification before ordering; do not select a replacement from the series name alone.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ5: Which details should I include when requesting a quotation?\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eProvide the exact model number, required quantity, preferred condition, delivery country, and target delivery date. Include any compatibility questions, required documentation, and photos of the existing unit. Ask the supplier to confirm stock status, warranty terms, shipping options, and whether the quoted scope includes accessories.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eRequest a quotation for the Allen-Bradley 1734-OB8.\u003c\/strong\u003e Share your required quantity, delivery destination, and existing hardware details to help confirm the correct item and shipping arrangement.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":67644143370422,"sku":"1734-OB8","price":106.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/1734-OB8-1.jpg?v=1792045384","url":"https:\/\/www.plcsparehub.com\/products\/1734-ob8-allen-bradley-1734-point-i-o-output-module","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}