{"product_id":"emerson-8121-di-dc-05-discrete-input-module","title":"Emerson 8121-DI-DC-05 Discrete Input Module","description":"\u003cp\u003eThe \u003cstrong\u003eEmerson 8121-DI-DC-05\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e8121-DI\u003c\/strong\u003e Discrete Input Module, operates as a dedicated hardware component for sensing discrete field contact states within PAC8000 I\/O systems. It interfaces 16 sourcing digital inputs directly with the system backplane across general-purpose and Zone 2 \/ Division 2 hazardous locations.\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\u003e8121-DI-DC-05\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eEmerson\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBase Model\u003c\/td\u003e\n\u003ctd\u003e8121-DI\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\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eApprox. 0.20 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard PAC8000 Module Width\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to 70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eSystem Current: 50 mA; Field Current: 190 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Channels\u003c\/td\u003e\n\u003ctd\u003e16-point sourcing inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e18 to 30 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreshold Current\u003c\/td\u003e\n\u003ctd\u003eON state: \u0026gt; 1.2 mA; OFF state: \u0026lt; 0.3 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResponse Time\u003c\/td\u003e\n\u003ctd\u003eSelectable from 2 ms to 512 ms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHazardous Area Rating\u003c\/td\u003e\n\u003ctd\u003eClass I, Div 2 \/ Zone 2 compliant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFeature Options\u003c\/td\u003e\n\u003ctd\u003eDirect field wiring termination, pulse counting capabilities\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 8121-DI-DC-05 operates within high-density PAC8000 carrier node configurations alongside analog instrumentation links. Galvanic isolation between field input circuits and the backplane logic bus prevents ground loop interference and protects control electronics from external voltage spikes. Internal filtering and optical isolation enable clean digital status execution without degrading adjacent 4-20 mA HART loop protocol signaling paths on shared node carriers.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How is input channel filtering configured on the 8121-DI-DC-05?\u003c\/p\u003e\n\u003cp\u003eA: Input channel response times are software-selectable across a range of 2 ms to 512 ms, allowing engineers to filter contact bounce and field line noise based on loop requirements.\u003c\/p\u003e\n\u003cp\u003eQ: Can the 8121-DI-DC-05 handle pulse input signals?\u003c\/p\u003e\n\u003cp\u003eA: Yes. The module includes specialized onboard pulse counting capabilities on designated input channels for totalizing high-speed discrete events.\u003c\/p\u003e\n\u003cp\u003eQ: What are the threshold current requirements for ON and OFF state detection?\u003c\/p\u003e\n\u003cp\u003eA: An input channel transitions to an ON state when current exceeds 1.2 mA, and drops to an OFF state when loop current falls below 0.3 mA.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eMount the module firmly onto the PAC8000 node carrier slot until the mechanical retention latch clicks completely into position.\u003c\/li\u003e\n\u003cli\u003eWire field contact leads directly to the carrier terminal block without requiring interposing external junction terminals.\u003c\/li\u003e\n\u003cli\u003eVerify the external field power supply falls within the specified 18 to 30 VDC operating range before energizing input loops.\u003c\/li\u003e\n\u003cli\u003eSeparate field discrete wiring from high-voltage AC lines and switching motor leads to eliminate capacitive crosstalk.\u003c\/li\u003e\n\u003cli\u003eConnect the carrier grounding bar directly to local protective earth (PE) using a low-impedance conductor to ensure compliance with Zone 2 \/ Division 2 hazardous area requirements.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"EMERSON","offers":[{"title":"Default Title","offer_id":53328077455669,"sku":"8121-DI-DC-05","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0973\/7630\/5461\/files\/8121-DI-DC-05.png?v=1787106535","url":"https:\/\/www.5gplc.com\/products\/emerson-8121-di-dc-05-discrete-input-module","provider":"High Five PLC Solution Limited","version":"1.0","type":"link"}