{"product_id":"8121-di-dc-01-mtl-discrete-input-module","title":"8121-DI-DC-01 | MTL | Discrete Input Module","description":"\u003ch3\u003e\u003cstrong\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eMTL 8121-DI-DC-01\u003c\/strong\u003e is a 16-channel discrete input module for the Emerson PAC8000 I\/O system (MTL Instruments). It supports dry-contact inputs and configurable functions such as pulse counting, input filtering, and latching. Engineered for general-purpose use and for Class I, Division 2 \/ Zone 2 hazardous environments, it delivers fast and reliable digital signal acquisition for industrial automation and process control.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Channels:\u003c\/strong\u003e 16 (non-isolated, internally commoned return)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Type:\u003c\/strong\u003e Dry contact switches (source type)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Voltage Range:\u003c\/strong\u003e 18–30 V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWetting Voltage:\u003c\/strong\u003e 24 V DC (provided on high side)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eON Current Threshold:\u003c\/strong\u003e \u0026gt; 1.2 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOFF Current Threshold:\u003c\/strong\u003e \u0026lt; 0.3 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWetting Current:\u003c\/strong\u003e 2.8 mA typical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum Pulse Width:\u003c\/strong\u003e 5 ms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Frequency (Pulse Mode):\u003c\/strong\u003e 100 Hz (no debounce)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolation:\u003c\/strong\u003e 250 VAC channel-to-Railbus\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResponse Time:\u003c\/strong\u003e ≤ 5 ms (field event to Railbus update)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Filter Options:\u003c\/strong\u003e Fast, Slow, or user-defined (0–512 ms in 2 ms steps)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLatch Inputs:\u003c\/strong\u003e Enable \/ Disable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLatch Polarity:\u003c\/strong\u003e Latch on high \/ Latch on low\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePulse Counting:\u003c\/strong\u003e Enable \/ Disable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRailbus Power Consumption:\u003c\/strong\u003e 90 mA typical, 135 mA max\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eField Power Requirement:\u003c\/strong\u003e 60 mA @ 18–30 V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModule Width:\u003c\/strong\u003e 42 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 210 g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModule Key Code:\u003c\/strong\u003e E1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e DIN rail or flat panel via PAC8000 carrier\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Field Terminal:\u003c\/strong\u003e 8617-FT-NI (recommended for Class I, Div 2 \/ Zone 2)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety Compliance:\u003c\/strong\u003e FM non-incendive field wiring parameters (Voc = 30 V, Isc = 3.5 mA, Ca = 0.12 μF, La = 1000 mH)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Environment:\u003c\/strong\u003e Suitable for safe area or Class I, Div 2 \/ Zone 2 hazardous area deployment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eInstallation \u0026amp; Safety Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMust be mounted in a PAC8000 carrier approved for hazardous locations.\u003c\/li\u003e\n\u003cli\u003eUse external fusing on the field power supply to protect wiring.\u003c\/li\u003e\n\u003cli\u003eEnsure proper grounding and shielding for optimal signal integrity.\u003c\/li\u003e\n\u003cli\u003eObserve spacing and segregation requirements per SCI control drawings and local installation standards.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MTL","offers":[{"title":"Default Title","offer_id":42529524744259,"sku":"8121-DI-DC-01","price":233.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/5810\/3107\/files\/8121-DI-DC-01.png?v=1756197644","url":"https:\/\/www.plcdcspro.com\/products\/8121-di-dc-01-mtl-discrete-input-module","provider":"PLC DCS Pro Ltd.","version":"1.0","type":"link"}