{"product_id":"yokogawa-ncu4-a-network-control-unit","title":"Yokogawa NCU4*A Network Control Unit","description":"\u003cp\u003eThe \u003cstrong\u003eYokogawa NCU4*A\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eNCU4\u003c\/strong\u003e Network Control Unit, operates as a dedicated hardware component for multi-protocol field signal acquisition and control network interfacing within Yokogawa DCS platforms. The module executes signal processing across 8 digital inputs, 8 digital outputs, 4 analog inputs, 2 analog outputs, and 2 pulse input channels. Physical connection channels transmit analog (+\/-10 V, +\/-20 mA) and digital (24 VDC) signals, establishing real-time communication across Modbus RTU, PROFIBUS DP, and Yokogawa proprietary fieldbus networks.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eCode Element\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification \/ Description\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNCU4\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBase model designation for network control unit series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e*\u003cstrong\u003eA\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003ctd\u003eStyle code Revision A specifying circuit board layout, terminal arrangement, and hardware revision\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eNCU4*A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eYokogawa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.2 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e100 mm x 100 mm x 50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-25 deg C to 70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e24 VDC nominal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDigital Inputs \/ Outputs\u003c\/td\u003e\n\u003ctd\u003e8 inputs (24 VDC) \/ 8 outputs (24 VDC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog Inputs \/ Outputs\u003c\/td\u003e\n\u003ctd\u003e4 inputs (+\/-10 V, +\/-20 mA) \/ 2 outputs (+\/-10 V, +\/-20 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePulse Inputs\u003c\/td\u003e\n\u003ctd\u003e2 channels (24 VDC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003e1500 Vrms between I\/O circuits and power supply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommunication Protocols\u003c\/td\u003e\n\u003ctd\u003eModbus RTU, PROFIBUS DP, Yokogawa proprietary protocol\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003ePROFIBUS DP Connectivity and Multi-Signal Isolation\u003c\/h3\u003e\n\u003cp\u003eThe NCU4*A network control unit integrates field instrumentation into central DCS controller logic via PROFIBUS DP, Modbus RTU, and Yokogawa proprietary bus architectures. To maintain signal fidelity across mixed analog (+\/-10 V, +\/-20 mA) and 24 VDC digital\/pulse loops, internal galvanic isolation barriers provide 1500 Vrms protection between field-side I\/O circuitry and the internal logic power supply. This isolation structure suppresses common-mode ground noise and prevents electrical surge propagation across connected controller subracks.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What isolation protection is provided between the field I\/O terminals and internal logic circuitry on the NCU4*A?\u003c\/p\u003e\n\u003cp\u003eA: The module provides 1500 Vrms galvanic isolation between the input\/output channels and the primary power supply rails to prevent electrical noise and ground loop currents.\u003c\/p\u003e\n\u003cp\u003eQ: What signal types are supported on the analog input and output channels of the NCU4*A?\u003c\/p\u003e\n\u003cp\u003eA: Both analog inputs (4 channels) and analog outputs (2 channels) accept and generate bipolar voltage signals (+\/-10 V) or current loop signals (+\/-20 mA).\u003c\/p\u003e\n\u003cp\u003eQ: How are the pulse input channels utilized within the module architecture?\u003c\/p\u003e\n\u003cp\u003eA: The two pulse input channels operate at 24 VDC nominal levels to capture frequency-based flowmeter or speed sensor signals, converting pulse counts directly into system register values.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical Mounting:\u003c\/strong\u003e Secure the 100 mm x 100 mm x 50 mm module onto a grounded mounting rail or chassis slot. Ensure mechanical latches lock fully to prevent vibration-induced displacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal \u0026amp; Bus Wiring:\u003c\/strong\u003e Separate 24 VDC power wiring, communication cables (PROFIBUS DP \/ Modbus RTU), and analog I\/O conductors into dedicated wire trays to avoid inductive noise coupling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShield Grounding:\u003c\/strong\u003e Connect communication and analog signal cable drain wires directly to the cabinet functional earth (FE) bus bar at a single termination point.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Spacing:\u003c\/strong\u003e Maintain a minimum clearance of 30 mm above and below the module housing to enable natural convection cooling and ensure ambient operating temperatures remain within -25 deg C to 70 deg C.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":53281401045301,"sku":"NCU4*A","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/NCU4A.png?v=1786687160","url":"https:\/\/www.5gplc.com\/products\/yokogawa-ncu4-a-network-control-unit","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}