{"product_id":"yokogawa-amm42t-2-wire-transmitter-input-multiplexer-module","title":"Yokogawa AMM42T 2-Wire Transmitter Input Multiplexer Module","description":"\u003cp\u003eThe Yokogawa \u003cstrong\u003eAMM42T \u003c\/strong\u003eis a specialized 2-wire transmitter input multiplexer module designed for the CENTUM CS and CENTUM VP distributed control systems. It addresses the critical need for high-density analog signal acquisition by allowing a single input channel to sequentially monitor multiple 4 to 20 mA DC loops. This module is essential for process industries where space is limited and loop density is high, offering a streamlined solution for connecting standard 2-wire transmitters while providing the necessary loop power (24 V DC) directly from the module.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eThe AMM42T is engineered to handle standard analog current loops with precise multiplexing capabilities.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003cth align=\"left\"\u003eParameter\u003c\/th\u003e\n\u003cth align=\"left\"\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e2-Wire Transmitter Input Multiplexer Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eModel Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003eAMM42T\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eCompatible Systems\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003eCENTUM CS, CENTUM VP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eInput Signal\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e4 to 20 mA DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eAllowable Input Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e40 mA or less\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eTransmitter Power Supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e23.5 to 24.5 V DC (Output power limit: 60 mA or less)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eInput Resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e250 Ω (Can be changed to 70 Ω when connected to barrier)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eSignal Isolation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003eNo isolation between system\/field or between channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eData Update Period\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e1 second\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eCurrent Consumption\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e4 A or less (5.0 V DC internal bus)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd align=\"left\"\u003e\u003cstrong\u003eShipping Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"left\"\u003e1 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eModel Code Interpretation\u003c\/h3\u003e\n\u003cp\u003eFor Yokogawa modules, the suffix code is critical as it defines the physical interface (connector vs. terminal) and the specific channel configuration.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAMM42T\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAMM42-AXX\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eA (Suffix -T):\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIndicates the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eTerminal Type\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e-T\u003c\/strong\u003e: Denotes that this module features screw terminals for direct field wiring. This allows for easy connection of transmitter wires without the need for specialized mating connectors or cable assemblies.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cem\u003eNote: This is distinct from the \"-C\" (Connector) version, which would require a specific cable harness.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation and Wiring Guidelines\u003c\/h3\u003e\n\u003cp\u003eTo ensure reliable operation and accurate current loop measurement, follow these installation practices:\u003c\/p\u003e\n\u003col class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCarrier Compatibility:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe AMM42T is designed to mount into specific I\/O carrier boxes (such as the AMN34). Ensure the module is fully inserted into the slot and the locking mechanism is engaged to secure the connection to the backplane.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eLoop Power Configuration:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe module provides a 24 V DC supply (23.5 to 24.5 V DC) to power the 2-wire transmitters. Ensure that the total current draw of the connected transmitters does not exceed the output power limit of 60 mA.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eInput Resistance Setting:\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eThe standard input resistance is\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e250 Ω\u003c\/strong\u003e, which converts the 4-20 mA current signal into a 1-5 V voltage signal for the system.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIf you are connecting the module to an intrinsic safety barrier, you may need to change the resistance setting to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e70 Ω\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eto ensure proper loop operation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eGrounding and Isolation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eNote that there is\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eno isolation\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ebetween the system and the field, nor between channels. This means all connected transmitters must share a common ground reference. Failure to observe this can result in ground loops or signal errors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the primary function of the AMM42T?\u003c\/strong\u003eA: The AMM42T acts as a multiplexer for 2-wire transmitters. It allows the control system to monitor multiple 4-20 mA loops using a single analog input channel, significantly reducing the hardware footprint.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does the AMM42T provide power to the transmitters?\u003c\/strong\u003eA: Yes, the module supplies\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e24 V DC\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(nominal) to power the connected 2-wire transmitters, eliminating the need for external power supplies for the field devices.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the AMM42T compatible with CENTUM VP?\u003c\/strong\u003eA: Yes, the AMM42T is fully compatible with both CENTUM CS and the newer CENTUM VP systems, allowing for seamless integration and hardware upgrades.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this module for isolated inputs?\u003c\/strong\u003eA: No. The technical specifications state there is\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eno isolation\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ebetween the system and field or between channels. If channel-to-channel isolation is required, you should consider using individual input modules or a different multiplexer architecture.\u003c\/p\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":52522851500341,"sku":"AMM42T","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/AMM42T1.jpg?v=1775035814","url":"https:\/\/www.5gplc.com\/products\/yokogawa-amm42t-2-wire-transmitter-input-multiplexer-module","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}