{"product_id":"allen-bradley-1746-ia16-c-slc-500-digital-i-o-module","title":"Allen-Bradley 1746-IA16\/C SLC 500 Digital I\/O Module","description":"\u003ch1\u003eAllen-Bradley 1746-IA16\/C SLC 500 Digital I\/O Module\u003c\/h1\u003e\n\u003cp\u003eThe Allen-Bradley 1746-IA16\/C, also cataloged as the 1746-IA16 AC Input Module, operates as a dedicated hardware component for AC digital signal acquisition within the SLC 500 I\/O backplane system.\u003c\/p\u003e\n\u003cp\u003eThe module interfaces 85–132 V AC field signals into 16 discrete input channels and converts them into backplane-level digital states for controller scan execution. It is electrically designed for 47–63 Hz input frequency range and supports point-to-point AC sensing with defined inrush and off-state thresholds. Lifecycle status is discontinued as of Nov 24, 2022.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003cth class=\"last:pe-10\"\u003eParameter\u003c\/th\u003e\n\u003cth class=\"last:pe-10\"\u003eSpecification\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\u003e1746-IA16\/C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e0.085 A @ 5 VDC backplane\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Channels\u003c\/td\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e85–132 V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Frequency\u003c\/td\u003e\n\u003ctd\u003e47–63 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Current\u003c\/td\u003e\n\u003ctd\u003e12 mA @ 120 V AC nominal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOFF-State Voltage\u003c\/td\u003e\n\u003ctd\u003e30 V AC max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOFF-State Current\u003c\/td\u003e\n\u003ctd\u003e2 mA max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInrush Current\u003c\/td\u003e\n\u003ctd\u003e0.8 A max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Delay\u003c\/td\u003e\n\u003ctd\u003eON 35 ms \/ OFF 45 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTerminal Type\u003c\/td\u003e\n\u003ctd\u003eRemovable terminal block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eBackplane Bus Communication Characteristics (SLC 500 Architecture)\u003c\/h3\u003e\n\u003cp\u003eThe module exchanges input state data through the SLC 500 chassis backplane bus with cyclic scan synchronization. Backplane current draw is limited to 5 VDC logic rail consumption, with deterministic update behavior aligned to controller scan time. Channel mapping is fixed per 16-point architecture without field-configurable scaling.\u003c\/p\u003e\n\u003ch3\u003eAC Input Signal Conditioning and Threshold Behavior\u003c\/h3\u003e\n\u003cp\u003eInput circuitry uses internal impedance conditioning to stabilize 85–132 V AC field signals. OFF-state detection is governed by leakage current discrimination up to 2 mA, preventing false transitions under induced voltage conditions. Inrush tolerance up to 0.8 A supports relay and mechanical contact closure events without input latch distortion.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions (FAQ)\u003c\/h3\u003e\n\u003cp\u003eQ: Does the 1746-IA16\/C support hot-swap insertion in an energized SLC 500 chassis?\u003cbr\u003eA: The module is not designed for live insertion. Backplane power should be removed before module installation or replacement to avoid bus transient corruption.\u003c\/p\u003e\n\u003cp\u003eQ: What is the backplane current impact during full 16-channel activation?\u003cbr\u003eA: Backplane consumption remains fixed at 0.085 A @ 5 VDC, independent of input channel state transitions.\u003c\/p\u003e\n\u003cp\u003eQ: Is firmware upgrade or field reconfiguration supported?\u003cbr\u003eA: No firmware layer is implemented in this module class. Operation is hardware-defined via backplane mapping only.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eThe module shall be installed in a compatible SLC 500 chassis slot with backplane alignment verified prior to insertion. Terminal wiring must be performed using the removable terminal block with AC input segregation from low-voltage control wiring.\u003c\/p\u003e\n\u003cp\u003eShielding and grounding practices should ensure single-point earth reference for AC field wiring to minimize induced noise coupling. Conductors must be routed with adequate separation from high-frequency switching lines. Module replacement requires full system power isolation to maintain backplane integrity and prevent signal corruption during insertion or removal.\u003c\/p\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":43504101130330,"sku":"1746-IA16\/C","price":123.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/1746-IA161.jpg?v=1779171469","url":"https:\/\/www.plcmasters.com\/products\/allen-bradley-1746-ia16-c-slc-500-digital-i-o-module","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}