{"product_id":"honeywell-621-4350r-digital-input-module","title":"Honeywell 621-4350R Digital Input Module","description":"\u003cp\u003eConfigured for high-speed signal acquisition in industrial control platforms, the \u003cstrong\u003eHoneywell 621-4350R\u003c\/strong\u003e (\u003cstrong\u003e621-4350R\u003c\/strong\u003e Input Module) provides direct physical\/electrical execution of 5 V TTL (Transistor-Transistor Logic) signal sensing across 16 discrete channels.\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\u003e621-4350R\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eHoneywell\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\u003e1.10 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard PLC module form factor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003eIndustrial control environment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eBackplane dependent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eI\/O Type\u003c\/td\u003e\n\u003ctd\u003e16 Point, 5 V TTL Digital Input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eIndustrial Control and Drive Characteristics\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackplane bus communication velocity:\u003c\/strong\u003e The module maintains deterministic timing with the PLC backplane to ensure rapid propagation of TTL signal transitions into the controller memory, essential for high-speed counter or interrupt-driven applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfinet \/ EtherNet\/IP deterministic networks:\u003c\/strong\u003e The input stage is engineered to maintain TTL logic level integrity, supporting stable signal transmission in systems requiring precise input state synchronization.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI\/O density scaling:\u003c\/strong\u003e The 16-point configuration provides a high-density footprint for interfacing with low-voltage logic devices, encoders, or proximity sensors compatible with standard TTL levels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFirmware flash compatibility:\u003c\/strong\u003e The module is designed for full hardware-level compatibility with standard PLC rack backplane communication protocols, ensuring seamless recognition during system initialization.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Is this module compatible with standard 24 VDC industrial sensors?\u003c\/p\u003e\n\u003cp\u003eA: No. The 621-4350R is specifically rated for 5 V TTL logic levels. Connection to 24 VDC sources will exceed the input voltage threshold and cause irreversible damage to the module logic gates and input circuitry.\u003c\/p\u003e\n\u003cp\u003eQ: What is the recommended cable length for TTL input signals?\u003c\/p\u003e\n\u003cp\u003eA: Due to the low voltage and potential for signal degradation, keep cable runs for TTL signals as short as possible. Use shielded, twisted-pair cabling to minimize crosstalk and induced noise, as TTL signals are sensitive to electromagnetic interference.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Seat the module firmly into the designated PLC rack slot, ensuring the backplane connector is fully seated. Lock the module into place to ensure physical stability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrounding:\u003c\/strong\u003e Verify a low-impedance ground connection between the module and the cabinet protective earth (PE) bus. A stable reference is mandatory for the precise detection of TTL threshold voltage levels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring:\u003c\/strong\u003e Maintain strict segregation between TTL signal cabling and high-power conduits to prevent inductive noise injection. Ensure proper signal return paths are established to avoid common-mode noise issues between the source device and the PLC input logic.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":48157252452542,"sku":"621-4350R","price":560.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/screenshot_2026-07-13_15-54-28_956d7788-c865-40d1-8f12-08763fd82d5e.png?v=1783935084","url":"https:\/\/www.autooiltech.com\/ar\/products\/honeywell-621-4350r-digital-input-module","provider":"AutoOilTech Limited","version":"1.0","type":"link"}