{"product_id":"allen-bradley-1771-noc-n-series-analog-i-o-module","title":"Allen-Bradley 1771-NOC N-Series Analog I\/O Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1771-NOC\u003c\/strong\u003e is an \u003cstrong\u003eN-Series 8-channel isolated analog current output module\u003c\/strong\u003e for PLC-5 systems. It provides high-resolution \u003cstrong\u003e0–25 mA current sourcing\u003c\/strong\u003e outputs with \u003cstrong\u003e14-bit resolution (3.20 µA\/bit)\u003c\/strong\u003e, making it ideal for precise control of pneumatic positioners, valve actuators, and legacy 4–20 mA instrumentation loops in process control applications.\u003c\/p\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModule Type:\u003c\/strong\u003e N-Series Analog Output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Outputs:\u003c\/strong\u003e 8 isolated current outputs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Type:\u003c\/strong\u003e Current sourcing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Range:\u003c\/strong\u003e 0–25 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResolution:\u003c\/strong\u003e 3.20 µA\/bit (approximately 14-bit)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Impedance:\u003c\/strong\u003e \u0026gt;1 MΩ\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackplane Current:\u003c\/strong\u003e 2.9 A (at 20 mA\/output); 3.3 A (at 25 mA\/output)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Dissipation:\u003c\/strong\u003e 5.5 W at 5 VDC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eData Format:\u003c\/strong\u003e BCD or natural binary\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUpdate Time:\u003c\/strong\u003e 25 ms maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOffset Drift:\u003c\/strong\u003e ±1 µA\/°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGain Drift:\u003c\/strong\u003e ±50 ppm\/°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Overvoltage Protection:\u003c\/strong\u003e 140 VAC RMS continuous\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRTP Compatibility:\u003c\/strong\u003e 1771-RTP3 (fused) \/ 1771-RTP4 (unfused)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring Arm:\u003c\/strong\u003e 1771-WH\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e 0–60 °C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStorage Temperature:\u003c\/strong\u003e −40–85 °C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHumidity:\u003c\/strong\u003e 5–95% non-condensing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFeatures \u0026amp; Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtended 0–25 mA Range:\u003c\/strong\u003e Supports standard 4–20 mA loops plus extended range for specific pneumatic positioners and legacy devices\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh 14-Bit Resolution:\u003c\/strong\u003e 3.20 µA\/bit enables smooth, step-free control signals minimizing valve hunting\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolated Outputs:\u003c\/strong\u003e Channel-to-channel isolation reduces ground loops and improves measurement integrity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProgrammable Reset Values:\u003c\/strong\u003e Each channel configurable for safe shutdown conditions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible RTP Options:\u003c\/strong\u003e Compatible with fused (1771-RTP3) or unfused (1771-RTP4) remote terminal blocks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobust Protection:\u003c\/strong\u003e 140 VAC RMS continuous overvoltage protection safeguards output circuitry\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePneumatic valve positioner control\u003c\/li\u003e\n\u003cli\u003eAnalog loop current instrumentation\u003c\/li\u003e\n\u003cli\u003eProportional control in process industries\u003c\/li\u003e\n\u003cli\u003eVariable speed drive analog references\u003c\/li\u003e\n\u003cli\u003eDamper and actuator positioning\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Power Verification:\u003c\/strong\u003e Ensure the 1771 chassis power supply can deliver \u003cstrong\u003e3.3A at 5VDC\u003c\/strong\u003e for full-load operation. This is a high-current module.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRTP Selection:\u003c\/strong\u003e Choose \u003cstrong\u003e1771-RTP3 (fused)\u003c\/strong\u003e for applications requiring individual channel fuse protection, or \u003cstrong\u003e1771-RTP4 (unfused)\u003c\/strong\u003e for simplified wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModule Installation:\u003c\/strong\u003e Insert the 1771-NOC into the 1771 chassis slot. Attach the 1771-WH wiring arm for field connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField Wiring:\u003c\/strong\u003e Connect current loop devices to the RTP terminals. Verify loop impedance is compatible with the \u0026gt;1 MΩ output impedance specification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Set data format (BCD or natural binary) and programmable reset values per application requirements via PLC-5 programming software.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibration Check:\u003c\/strong\u003e Verify output accuracy across the 0–25 mA range using a calibrated current meter before commissioning.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can the 1771-NOC output voltage signals?\u003c\/strong\u003e\u003cbr\u003e\nA: No. The 1771-NOC is strictly a current sourcing module (0–25 mA). For voltage output (e.g., 0–10V), select a different 1771-N series module rated for voltage output.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Why does this module draw so much backplane current?\u003c\/strong\u003e\u003cbr\u003e\nA: The 1771-NOC sources current directly from the backplane to drive field loads. At full 25 mA per channel, it draws up to 3.3A. Ensure your power supply is adequately sized.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between 1771-RTP3 and 1771-RTP4?\u003c\/strong\u003e\u003cbr\u003e\nA: 1771-RTP3 includes individual channel fuses for protection; 1771-RTP4 is unfused for applications where external protection is provided.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is the 0–25 mA range compatible with standard 4–20 mA devices?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes. The 0–25 mA range fully encompasses the 4–20 mA standard. Program your output scaling accordingly in the PLC-5 processor.\u003c\/p\u003e\n\n\u003ch3\u003eSelection Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCritical:\u003c\/strong\u003e Verify chassis power supply capacity (3.3A at 5VDC max) before installing this module\u003c\/li\u003e\n\u003cli\u003eConfirm field devices accept 0–25 mA current signals; some devices are limited to 4–20 mA\u003c\/li\u003e\n\u003cli\u003eSelect fused RTP (1771-RTP3) for safety-critical applications\u003c\/li\u003e\n\u003cli\u003eConsider loop impedance and cable length to ensure signal integrity\u003c\/li\u003e\n\u003cli\u003eFor new installations, evaluate ControlLogix 1756-OF8I or CompactLogix analog output modules\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":53803390206136,"sku":"1771-NOC","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/1771-OBDr180.png?v=1784796363","url":"https:\/\/www.globalpetroparts.com\/products\/allen-bradley-1771-noc-n-series-analog-i-o-module","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}