{"product_id":"1756-of4-allen-bradley-controllogix-4-channel-analog-output-module","title":"1756-OF4 Allen-Bradley ControlLogix 4-Channel Analog Output Module","description":"\u003ch3\u003e\u003cstrong\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003e1756-OF4 Allen-Bradley\u003c\/strong\u003e\u003c\/span\u003e \u003ca href=\"https:\/\/www.plcsparehub.com\/collections\/allen-bradley-1756-controllogix\"\u003eControlLogix\u003c\/a\u003e Analog Output Module delivers 4 individually configurable high-precision voltage\/current outputs for closed-loop industrial process control. Designed for seamless integration within the ControlLogix 1756 chassis backplane, this high-performance module supports ±10V DC and 4–20 mA current loops with 15-bit conversion resolution. Featuring Removal and Insertion Under Power (RIUP), onboard channel alarm diagnostics, scaling to engineering units, and selectable floating-point or integer data formats, the unit provides fast settling times (\u0026lt;2 ms to 95%) and reliable command transmission to modulating field devices.\u003c\/p\u003e\n\u003ch3\u003eControl Architecture \u0026amp; System Integration\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eAllen-Bradley ControlLogix 1756 Platform\u003c\/strong\u003e\u003c\/span\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnalog Output Hardware [1756-OF4]:\u003c\/strong\u003e 4-Channel Non-Isolated Analog Output Engine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal Output Configuration:\u003c\/strong\u003e Independently Selectable ±10V DC Voltage or 0–20 mA \/ 4–20 mA Current Channels\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConversion Resolution:\u003c\/strong\u003e 15-Bit across 10.5V (320 µV\/bit) \/ 15-Bit across 21 mA (650 nA\/bit)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemovable Terminal Block (RTB) Options:\u003c\/strong\u003e Requires 1756-TBNH (20-Pin NEMA) or 1756-TBSH (20-Pin Spring Clamp)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackplane Current Draw:\u003c\/strong\u003e 150 mA @ 5.1 Vdc \/ 120 mA @ 24 Vdc (Total Backplane Power: 5.8 W)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExecution Scan Time:\u003c\/strong\u003e 8 ms Integer Format \/ 12 ms IEEE 32-Bit Floating-Point Format\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEngineering Specifications \u0026amp; Electrical Limits\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eTechnical Parameter\u003c\/th\u003e\n\u003cth\u003eField Specification Detail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer Name\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eAllen-Bradley \/ Rockwell Automation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCatalog Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003e1756-OF4\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Series\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003eControlLogix Analog Module\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChannel Count\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 Voltage\/Current Outputs (Non-Isolated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVoltage Load Drive Capability\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026gt; 2000 Ω (Resistive Drive)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCurrent Load Drive Capability\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0 to 750 Ω (Resistive Load)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum Power Dissipation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.25 W (4-Channel Current Mode) \/ 4.9 W Maximum @ 60°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThermal Heat Dissipation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10.91 BTU\/hr Output Rating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIsolation Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e250V Continuous Isolation (Tested at 1350V AC for 2 Seconds)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShort-Circuit \u0026amp; Open Detection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCurrent Limited to ≤21 mA \/ Open Circuit Detection for Current Outputs (\u0026gt;0.1 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCalibrated Accuracy\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.15% Voltage Range Error \/ 0.3% Current Range Error\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eOperational Applications \u0026amp; Field Deployments\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTarget Field Equipment:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eVariable Frequency Drives (VFDs) requiring 0–10V or 4–20 mA speed reference commands.\u003c\/li\u003e\n\u003cli\u003eModulating control valves, dampers, louvers, and electro-pneumatic positioners in PID control loops.\u003c\/li\u003e\n\u003cli\u003eSignal retransmission to paper chart recorders, external indicators, remote data loggers, and supervisory DCS systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustry Deployment Scenarios:\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003ePrecision chemical dosing skids and flow rate regulation in water processing plants.\u003c\/li\u003e\n\u003cli\u003eTurbine governor valve position control and burner management airflow regulation.\u003c\/li\u003e\n\u003cli\u003eHVAC air handling unit damper positioning and temperature control loops.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDiagnostic \u0026amp; Predictive Monitoring Features\u003c\/h3\u003e\n\u003cp\u003eThe \u003cspan style=\"color: #0056b3;\"\u003e\u003cstrong\u003e1756-OF4 Allen-Bradley\u003c\/strong\u003e\u003c\/span\u003e module incorporates extensive channel-level diagnostics that report health status directly to the Logix owner controller via producer\/consumer implicit messaging. Integrated open-circuit detection immediately alerts operators if field wiring to a 4–20 mA actuator breaks (when output \u0026gt;0.1 mA). Internal current-limiting hardware restricts output short-circuits to 21 mA, preventing board destruction. Additionally, rolling timestamps and status tags allow commissioning technicians to track transient ground loops, channel saturation, and module calibration drift without stopping rack operations.\u003c\/p\u003e\n\u003ch3\u003eGlobal PLC Spare HUB's Insight\u003c\/h3\u003e\n\u003cp\u003eDuring a boiler feed pump overhaul, field technicians reported that a newly installed replacement module failed to move a 4–20 mA modulating control valve, holding the output at 0 mA despite valid PLC program tags. Our engineers identified that while backplane power was healthy, the output channels were left uncalibrated after a firmware flash, causing the card to trigger an internal fault bit. Performing an offset calibration pass via RSLogix 5000 \/ Studio 5000 and confirming the 1756-TBNH wiring terminal seating immediately restored precise 4–20 mA loop control. Always verify that calibration parameters align with your analog field device range during annual maintenance shutdowns.\u003c\/p\u003e\n\u003ch3\u003eWarranty, Packaging \u0026amp; Courier Logistics\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Condition:\u003c\/strong\u003e 100% Brand New and Genuine Factory Original Hardware\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty Policy:\u003c\/strong\u003e Comprehensive 12-Month Quality Guarantee from dispatch date\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Dispatch Window:\u003c\/strong\u003e Immediate handling with order processing in 24 to 48 hours\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGlobal Delivery Network:\u003c\/strong\u003e Express door-to-door air delivery through FedEx, UPS, and DHL\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEngineering Selection \u0026amp; Operational FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I choose between the 1756-TBNH and 1756-TBSH removable terminal blocks for wiring this output card?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 1756-TBNH utilizes traditional screw-clamp terminals suited for solid wire, while the 1756-TBSH features spring-clamp terminals ideal for high-vibration environments and multi-strand wire with ferrules. Both 20-pin housings are fully compatible with this chassis module.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat occurs to the channel outputs if communication with the primary controller is unexpectedly lost?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYou can program each individual channel's fault behavior in Studio 5000 to either Hold Last State, Go to Low Limit (-10V\/0mA), or Go to High Limit (+10V\/21mA). This prevents dangerous uncontrolled valve travel during network interruptions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs field calibration necessary prior to putting a newly unboxed card into active service?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEvery unit comes factory calibrated. However, Rockwell recommends a field calibration check every 12 months using a high-accuracy digital multimeter (better than 0.05% accuracy) to maintain tight analog loop tolerances over aging components.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan voltage and current output modes be mixed across different channels on the same board?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. Channel configuration is completely independent. For example, Channel 0 can drive a 4–20 mA VFD reference, while Channel 1 provides a ±10V signal to a proportional valve inside the same chassis assembly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the primary operational difference between integer mode and floating-point data mode?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eInteger mode offers faster scan times (8 ms) by using raw bit counts (-32768 to 32767), while floating-point mode (12 ms scan) allows direct engineering units (e.g., 0–100% or GPM) to be written straight to module tags, eliminating manual scaling logic in PLC code.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":45013810053302,"sku":"1756-OF4","price":120.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/1756-OF4_2.jpg?v=1787734726","url":"https:\/\/www.plcsparehub.com\/products\/1756-of4-allen-bradley-controllogix-4-channel-analog-output-module","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}