{"product_id":"alu4-d-modular-i-o-system-yokogawa","title":"ALU4*D Modular I\/O System | Yokogawa","description":"\u003ch2\u003eYokogawa ALU4*D Modular I\/O System\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eYokogawa AAI141\u003c\/strong\u003e, also cataloged as the \u003ci\u003eALU4D\u003c\/i\u003e* Analog Input Module, operates as a dedicated hardware component for 4-20 mA DC signal acquisition within Yokogawa CENTUM VP and CENTUM CS 3000 distributed control systems.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel Brand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYokogawa ALU4*D Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.2 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard DIN-rail mount modular width\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0 to 60 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Consumption\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e310 mA @ 5 VDC, 450 mA @ 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNumber of Input Channels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16, non-isolated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Signal Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 to 20 mA DC, 1 to 5 V DC, -10 to 10 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAllowable Common Mode Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e±1 V or less\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Resistance (Power ON)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e400 Ohm @ 20 mA, 1000 Ohm @ 4 mA, 1 MOhm or larger\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Resistance (Power OFF)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e500 kOhm or larger, 340 kOhm or larger, 660 kOhm or larger\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAccuracy\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e±16 uA, ±4 mV, ±20 mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eData Update Period\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStep Response Time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTransmitter Power Supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14.8 V or higher @ 20 mA, 26.4 V or less @ 0 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Current Limit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e27 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003e4-20 mA HART Loop Protocol Handling\u003c\/h3\u003e\n\u003cp\u003eChannel-level configuration pins define 2-wire or 4-wire transmitter excitation sourcing. The module supplies a regulated 24 VDC loop power rail to active field devices. The input circuitry tolerates a maximum common mode voltage of ±1 V DC. Transmitter supply voltage regulation maintains output above 14.8 V DC under full 20 mA load conditions. The input resistance profile scales inversely with current magnitude, presenting 400 Ohm at 20 mA and rising to 1000 Ohm at 4 mA. This characteristic requires verification against field transmitter load drive capability specifications.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the ALU4*D support hot-swapping while the CENTUM VP node is operational?\u003c\/p\u003e\n\u003cp\u003eA: Yes, the module supports online replacement. The system backplane maintains communication integrity during the exchange procedure. Verify that the replacement unit matches the existing I\/O assignment configuration prior to insertion.\u003c\/p\u003e\n\u003cp\u003eQ: What is the impact of non-isolated channel design on wiring practices?\u003c\/p\u003e\n\u003cp\u003eA: All 16 input channels share a common reference potential. Field wiring must ensure that external sensor grounds do not introduce ground loops exceeding the ±1 V common mode limit. Use isolated barrier devices if field device grounding conflicts occur.\u003c\/p\u003e\n\u003cp\u003eQ: How does temperature drift affect calibration intervals?\u003c\/p\u003e\n\u003cp\u003eA: Accuracy drift is specified at ±16 uA per 10 degC. For applications requiring sustained high precision, perform field calibration checks when ambient temperature variations exceed 30 degC from the initial calibration environment.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eMount the module onto the dedicated Yokogawa baseplate assembly. Use the pressure clamp terminal blocks for field wiring termination. Ensure that the shield drain wire connects directly to the designated earth ground point on the baseplate to maintain signal integrity. Torque terminal screws to the manufacturer-specified value to prevent thermal expansion loosening. Verify that the KS cable or MIL connector routing avoids parallel runs with high-voltage power conductors to minimize electromagnetic interference pickup.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":44209091805272,"sku":"ALU4*D","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/2039\/0488\/files\/ALU4D-2.jpg?v=1780976504","url":"https:\/\/www.industriaxplc.com\/products\/alu4-d-modular-i-o-system-yokogawa","provider":"IndustriaX Limited","version":"1.0","type":"link"}