{"product_id":"allen-bradley-1756-of8h-hart-analog-output-module-controllogix","title":"Allen-Bradley 1756-OF8H HART Analog Output Module-ControlLogix","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eWhen your process demands precise analog output control with HART communication, the Allen-Bradley 1756-OF8H delivers. This ControlLogix module provides eight differential voltage or current output channels with a single Highway Addressable Remote Transducer (HART) modem. It fits seamlessly into any 1756 chassis, occupying a single slot, and operates as a local or remote I\/O module.\u003c\/p\u003e\u003cp\u003eEach channel on the 1756-OF8H is configurable for 0-20 mA or 4-20 mA current loops, as well as ±10 VDC voltage outputs. The module's 15-16 bit resolution ensures fine-grained control across all signal ranges. With its R-Ladder DAC conversion method, you get monotonicity with no missing codes, guaranteeing reliable performance in demanding applications.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e1756-OF8H\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\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eControlLogix\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003eAnalog Output Module with HART capability\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Outputs\u003c\/td\u003e\n\u003ctd\u003e8 Differential\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Signal\u003c\/td\u003e\n\u003ctd\u003eCurrent: 0-20 mA; 4-20 mA; Voltage: ±10 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e15-16 Bits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003e50 Volts Continuous\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOvervoltage Protection\u003c\/td\u003e\n\u003ctd\u003e±24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccuracy\u003c\/td\u003e\n\u003ctd\u003eVoltage: 0.1% of range; Current: 0.5% of range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Format\u003c\/td\u003e\n\u003ctd\u003eInteger mode (left justified, 2's complement); IEEE 32-bit floating point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Conversion Method\u003c\/td\u003e\n\u003ctd\u003eR-Ladder DAC, monotonicity with no missing codes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Draw\u003c\/td\u003e\n\u003ctd\u003e230 mA @ 5.1 VDC and 230 mA @ 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRemovable Terminal Blocks\u003c\/td\u003e\n\u003ctd\u003e1756-TBNH, 1756-TBSH, 1756-TBCH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHART Communication:\u003c\/strong\u003e Integrated HART modem allows digital process data overlay on analog signals, enhancing diagnostics and maintenance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Outputs:\u003c\/strong\u003e Each channel supports both current and voltage signals, reducing inventory and simplifying system design.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Resolution:\u003c\/strong\u003e 15-16 bit resolution provides precise control for critical loops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen Circuit Detection:\u003c\/strong\u003e For current outputs set below 0.1 mA, the module detects open circuits, improving fault visibility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField-Replaceable Terminal Blocks:\u003c\/strong\u003e Supports 1756-TBNH, 1756-TBSH, and 1756-TBCH for easy wiring and maintenance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eIndustry Applications\u003c\/h2\u003e\u003cp\u003eIn process industries such as oil and gas, chemical, and water treatment, the Allen-Bradley 1756-OF8H excels. Use it to drive valve positioners, variable frequency drives, or chart recorders with 4-20 mA loops. The HART capability lets you retrieve device diagnostics from smart transmitters, reducing downtime. In discrete manufacturing, the module handles ±10 VDC signals for servo drives and analog actuators. Its 50V continuous isolation and ±24V overvoltage protection safeguard the module in harsh electrical environments.\u003c\/p\u003e\u003ch2\u003eInstallation \u0026amp; Setup\u003c\/h2\u003e\u003cp\u003eInstall the 1756-OF8H into any ControlLogix chassis slot. Ensure the chassis power supply can handle the module's current draw of 230 mA @ 5.1 VDC and 230 mA @ 24 VDC. Use the removable terminal block (RTB) that suits your wiring: 1756-TBNH for single or double wires (0.33-2.1 mm² \/ 22-14 AWG single, 0.33-1.3 mm² \/ 22-16 AWG double), or 1756-TBSH for single wire only (0.33-1.3 mm² \/ 22-16 AWG). Configure each channel via the ControlLogix programming software, selecting current or voltage mode and scaling as needed. For HART, connect the modem to the appropriate terminals.\u003c\/p\u003e\u003ch2\u003eMaintenance \u0026amp; Reliability\u003c\/h2\u003e\u003cp\u003eRegularly inspect the module for dust buildup and ensure proper airflow. Check that terminal block screws are tight to avoid loose connections. The module's open-style enclosure requires a clean environment; if installed in a dusty area, use a filtered cabinet. Calibration accuracy is 0.1% (voltage) and 0.5% (current) without HART, and Rockwell recommends a 12-month calibration interval. With proper care, the 1756-OF8H provides years of reliable service, minimizing total cost of ownership.\u003c\/p\u003e\u003ch2\u003eCompatibility \u0026amp; Integration\u003c\/h2\u003e\u003cp\u003eThe 1756-OF8H is part of the ControlLogix family and works with any 1756 chassis and compatible ControlLogix controllers. It supports both local and remote I\/O configurations. The module communicates over the backplane, so no external network configuration is needed for basic operation. For HART, the module integrates with Rockwell's FactoryTalk software for device management.\u003c\/p\u003e\u003ch2\u003eBuying Guide\u003c\/h2\u003e\u003cp\u003eBefore purchasing, verify that the 1756-OF8H matches your required output count and signal types. Confirm your chassis slot availability and power budget. Choose the correct removable terminal block (1756-TBNH, 1756-TBSH, or 1756-TBCH) for your wiring needs. PLC Source PRO offers genuine Allen-Bradley products with fast shipping and competitive pricing. Trust PLC Source PRO as your reliable supplier for industrial automation spares.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default","offer_id":44435891650659,"sku":"1756-OF8H","price":276.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0678\/8635\/0435\/files\/1756-2WS_ee838bb3-82fc-4734-add0-504a692e9adc.jpg?v=1785790105","url":"https:\/\/www.plcsourcepro.com\/products\/allen-bradley-1756-of8h-hart-analog-output-module-controllogix","provider":"PLC Source PRO","version":"1.0","type":"link"}