{"product_id":"allen-bradley-1746-int4-slc-500-thermocouple-input-module","title":"Allen-Bradley 1746-INT4 SLC 500 Thermocouple Input Module","description":"\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 1746-INT4\/C\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e1746INT4\u003c\/strong\u003e Thermocouple Input Module, operates as a dedicated hardware component for low-level millivolt and temperature signal acquisition within SLC 500 programmable controller systems.\u003c\/p\u003e\n\u003ch3\u003eCatalog Suffix Matrix\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBase Model: 1746-INT4\u003c\/li\u003e\n\u003cli\u003eRevision Suffixes: 1746-INT4\/B, 1746-INT4\/C\u003c\/li\u003e\n\u003cli\u003ePlatform Series: SLC 500\u003c\/li\u003e\n\u003cli\u003eFunction Class: Isolated Analog Input\u003c\/li\u003e\n\u003c\/ul\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\u003e1746-INT4\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\u003eUnited States\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.4 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Dimensions\u003c\/td\u003e\n\u003ctd\u003e12.7 cm x 5.1 cm x 15.2 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 deg C to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e110 mA at 5 VDC, 85 mA at 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Range\u003c\/td\u003e\n\u003ctd\u003e-50 to 50 MVDC, -100 to 100 MVDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eNetwork Backplane Communication and I\/O Scaling\u003c\/h3\u003e\n\u003cp\u003eThe module communicates via the proprietary chassis backplane bus, utilizing established communication velocity licenses to interface directly with the CPU. It handles discrete channel inputs through high-density scaling algorithms while supporting firmware flash compatibility across standard SLC 500 rack environments. Real-time data updates synchronize with the controller scan cycle to maintain deterministic loop performance.\u003c\/p\u003e\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 1746-INT4 Thermocouple Input Module unit\u003c\/li\u003e\n\u003cli\u003e1 Removable terminal block connector interface\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003ePhysical Installation Procedures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eChassis Slot Placement: Insert the module into any available I\/O slot of an SLC 500 modular chassis, ensuring the backplane connector aligns securely without forcing.\u003c\/li\u003e\n\u003cli\u003eWiring Shielding: Terminate all thermocouple extension wire shields to a dedicated ground bus to mitigate electromagnetic interference and common-mode voltage spikes.\u003c\/li\u003e\n\u003cli\u003eTerminal Torquing: Secure all field input wires within the removable terminal block using proper screwdriver torque limits to prevent intermittent electrical connections.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eQ: Does the 1746-INT4 module support live hot-swapping inside a powered chassis?\u003c\/li\u003e\n\u003cli\u003eA: No. Power to the chassis rack must be completely disconnected before inserting or removing the module to prevent electrical damage to the backplane bus.\u003c\/li\u003e\n\u003cli\u003eQ: What is the primary function of the voltage input ranges supported?\u003c\/li\u003e\n\u003cli\u003eA: The module accepts low-level millivolt signals ranging from -50 to 50 MVDC and -100 to 100 MVDC, suitable for direct thermocouple transducer interfacing.\u003c\/li\u003e\n\u003cli\u003eQ: How is operating power supplied to internal module circuitry?\u003c\/li\u003e\n\u003cli\u003eA: Power is drawn directly from the chassis power supply through the backplane, consuming 110 mA at 5 VDC and 85 mA at 24 VDC.\u003c\/li\u003e\n\u003cli\u003eQ: Are input channels electrically isolated?\u003c\/li\u003e\n\u003cli\u003eA: Yes, the module features built-in channel isolation to protect against ground loops and common-mode voltage transients across industrial measurement points.\u003c\/li\u003e\n\u003cli\u003eQ: Can this module interface with modern ControlLogix controllers directly?\u003c\/li\u003e\n\u003cli\u003eA: No. It is physically and logically engineered exclusively for the legacy Allen-Bradley SLC 500 modular hardware rack architecture.\u003c\/li\u003e\n\u003cli\u003eQ: What indicates a normal operational state on the front faceplate?\u003c\/li\u003e\n\u003cli\u003eA: Operational status is communicated via diagnostic LED indicators that display hardware health and active communication states with the processor.\u003c\/li\u003e\n\u003cli\u003eQ: What gauge of wire should be used for terminal connections?\u003c\/li\u003e\n\u003cli\u003eA: Use twisted-pair copper thermocouple extension wires sized between 22 AWG and 14 AWG for optimal signal integrity.\u003c\/li\u003e\n\u003cli\u003eQ: Is field calibration required during initial deployment?\u003c\/li\u003e\n\u003cli\u003eA: Factory calibration is preset, but software configuration scaling within the programming environment must match the specific thermocouple type attached.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen-Bradley","offers":[{"title":"Default Title","offer_id":46066404819117,"sku":"1746-INT4","price":199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/1613\/9181\/files\/1746-INT433.jpg?v=1785143435","url":"https:\/\/www.maxwellplc.com\/ga\/products\/allen-bradley-1746-int4-slc-500-thermocouple-input-module","provider":"Maxwell PLC Ltd","version":"1.0","type":"link"}