{"product_id":"yokogawa-amm42-s4-multiplexer-input-module","title":"Yokogawa AMM42 S4 Multiplexer Input Module","description":"\u003cp\u003eConfigured for high-density field signal acquisition in Field Control Station (FCS) architectures, the \u003cstrong\u003eYokogawa AMM42 S4\u003c\/strong\u003e (\u003cstrong\u003eAMM42\u003c\/strong\u003e Multiplexer Input Module) provides direct physical\/electrical execution. It handles signal multiplexing across non-isolated field channels, routing sensor data directly over the Yokogawa DCS backplane interface.\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\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\u003eAMM42 S4\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\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to 55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eBackplane system powered\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTransmitter Power Supply\u003c\/td\u003e\n\u003ctd\u003e23.5 to 24.5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Power Limit\u003c\/td\u003e\n\u003ctd\u003e60 mA or less\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Resistance\u003c\/td\u003e\n\u003ctd\u003e250 ohm (modifiable to 70 ohm with barrier connection)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Isolation\u003c\/td\u003e\n\u003ctd\u003eNon-isolated (system to field and channel-to-channel)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRedundancy Architecture\u003c\/td\u003e\n\u003ctd\u003ePair and Spare fully redundant configuration\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 and Channel Isolation\u003c\/h3\u003e\n\u003cp\u003eThe AMM42 S4 operates using a Pair and Spare fault-tolerant architecture to deliver deterministic data acquisition without a single point of failure. The module directly interfaces with 4-20 mA current loops, providing an internal loop transmitter power supply rated from 23.5 to 24.5 VDC with an output current limit of 60 mA. Featuring an internal input resistance of 250 ohm (adjustable to 70 ohm when interfaced through intrinsic safety barriers), the board prioritizes high-speed multiplexing across non-isolated signal lines, relying on external cabinet isolation barriers or single-point grounding schemes to suppress common-mode line interference before processing field signals into system memory.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How does the Pair and Spare configuration function on the AMM42 S4 module?\u003c\/p\u003e\n\u003cp\u003eA: The architecture runs dual redundant hardware pairs simultaneously to compare calculation outputs, allowing immediate switchover without interrupting control execution if a hardware error is detected.\u003c\/p\u003e\n\u003cp\u003eQ: Can the internal 250 ohm input resistance be altered for barrier loops?\u003c\/p\u003e\n\u003cp\u003eA: Yes, the module input circuit can be modified to 70 ohm to accommodate impedance requirements when wired through external safety barriers.\u003c\/p\u003e\n\u003cp\u003eQ: Are individual channels on the AMM42 S4 galvanically isolated from one another?\u003c\/p\u003e\n\u003cp\u003eA: No, the module design features non-isolated signal channels both between individual field channels and between the system backplane and field terminals.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eESD Protection:\u003c\/strong\u003e Attach a grounded anti-static wrist strap prior to handling the printed circuit card to protect onboard surface-mount components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRack Mounting:\u003c\/strong\u003e Slide the card along the sub-rack guide rails until the rear edge-connector seats fully into the backplane, then tighten all faceplate retaining screws.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal Isolation:\u003c\/strong\u003e Because channels lack internal galvanic isolation, ensure external isolation barriers or signal conditioners are used where channel cross-talk or ground loop risks exist.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring Separation:\u003c\/strong\u003e Route low-voltage analog input leads in dedicated shielded channels away from AC power lines and high-current switching devices.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":53312608239925,"sku":"AMM42 S4","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/AMM42_8ee16b47-2632-4855-bbb7-38052a1f5764.jpg?v=1786945438","url":"https:\/\/www.5gplc.com\/products\/yokogawa-amm42-s4-multiplexer-input-module","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}