{"product_id":"allen-bradley-1756-ob8-controllogix-dc-output-module","title":"Allen-Bradley 1756-OB8 ControlLogix DC Output Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\u003cp\u003eThe 1756-OB8 is a high-integrity direct current (DC) digital source output module engineered for the Allen-Bradley ControlLogix 1756 chassis platform. This chassis-based I\/O component functions as a solid-state electrical control switch, managing up to 8 independent field-side actuator channels. It delivers continuous, low-latency switching control across intensive industrial networks, including chemical processing, water treatment, automotive assembly, and power distribution systems. By routing logic-level system instructions into high-current sourcing circuits, this unit effectively drives external DC field loads—such as solenoids, relays, pilot lamps, and contactor coils—while shielding backplane microprocessors from electrical noise and voltage spikes.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e8-point digital DC sourcing output configuration.\u003c\/li\u003e\n\u003cli\u003eOrganized into two isolated groups of 4 channels each, allowing for separate field power distribution loops.\u003c\/li\u003e\n\u003cli\u003eCompatible with 1756-TBNH and 1756-TBSH 20-pin Removable Terminal Blocks (RTB).\u003c\/li\u003e\n\u003cli\u003eSupports hot-swappable module replacement to minimize system downtime.\u003c\/li\u003e\n\u003cli\u003eProgrammable fault and program mode states (Hold Last State, ON, or OFF).\u003c\/li\u003e\n\u003cli\u003eUser-defined mechanical keying to prevent incorrect module insertion.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eApplications\u003c\/h3\u003e\u003cp\u003eThe 1756-OB8 is designed for demanding industrial environments requiring reliable DC load switching. Typical applications include:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eAutomotive manufacturing and assembly lines.\u003c\/li\u003e\n\u003cli\u003eMunicipal water and wastewater treatment facilities.\u003c\/li\u003e\n\u003cli\u003eChemical and petrochemical processing plants.\u003c\/li\u003e\n\u003cli\u003ePower generation and distribution substations.\u003c\/li\u003e\n\u003cli\u003eGeneral machine control and factory automation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable border=\"1\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e1756-OB8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutputs\u003c\/td\u003e\n\u003ctd\u003e8 Points (2 isolated groups of 4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Range\u003c\/td\u003e\n\u003ctd\u003e10 to 30 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Current Per Point\u003c\/td\u003e\n\u003ctd\u003e2 A @ 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Current Per Module\u003c\/td\u003e\n\u003ctd\u003e8 A @ 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMin Load Current\u003c\/td\u003e\n\u003ctd\u003e2 mA per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBackplane Power (5.1V)\u003c\/td\u003e\n\u003ctd\u003e165 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Dissipation\u003c\/td\u003e\n\u003ctd\u003e2.5 Watts @ 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003e250 V continuous\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEnsure the ControlLogix chassis is powered down before inserting or removing the module.\u003c\/li\u003e\n\u003cli\u003eUse appropriate mechanical keying on the RTB to prevent incorrect module-to-wiring matches.\u003c\/li\u003e\n\u003cli\u003eEnsure field power supply is within the 10-30 VDC range and properly fused for the connected load.\u003c\/li\u003e\n\u003cli\u003eMaintain proper grounding practices for the chassis to minimize EMI\/RFI interference.\u003c\/li\u003e\n\u003cli\u003eVerify that the RTB is securely latched to the module housing to ensure reliable electrical contact.\u003c\/li\u003e\n\u003cli\u003eKeep the module clear of high-heat sources and ensure adequate ventilation within the cabinet.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eCan I replace the 1756-OB8 while the system is running?\u003c\/strong\u003e Yes, this module supports Removal and Insertion Under Power (RIUP) when installed in a ControlLogix chassis, provided the hazardous area requirements are met.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the 1756-TBNH and 1756-TBSH terminals?\u003c\/strong\u003e The 1756-TBNH is a standard cage clamp terminal block, while the 1756-TBSH is a spring clamp terminal block. Both are compatible with the 1756-OB8.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":50980925636860,"sku":"1756-OB8","price":77.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/wm_1_d72374da-9a3a-4383-9349-00813adca9f4.jpg?v=1786731822","url":"https:\/\/www.electronicplc.com\/es\/products\/allen-bradley-1756-ob8-controllogix-dc-output-module","provider":"Electronic PLC","version":"1.0","type":"link"}