{"product_id":"beckhoff-ks4494-bus-terminal-analog-input-output-module","title":"Beckhoff KS4494 Bus Terminal Analog Input\/Output Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eInterfacing field instruments with standard PLC process control systems requires reliable, noise-resistant signal conversion. The \u003cstrong\u003eBeckhoff KS4494\u003c\/strong\u003e Bus Terminal integrates physical analog measurement and signal output capabilities into a single, space-saving 12 mm housing module. Operating directly on the standard K-bus backplane, this module provides dual-channel analog inputs and dual-channel analog outputs configured for bipolar \u003cstrong\u003e-10 to +10 V\u003c\/strong\u003e single-ended signaling. Its distinct pluggable wiring interface enables rapid, error-free wiring field assembly and hot-swappable terminal block replacements without disturbing permanent control cabinet wiring connections.\u003c\/p\u003e\n\n\u003ch3 style=\"color: #1a365d; border-bottom: 2px solid #2b6cb0; padding-bottom: 0.25rem;\"\u003eKey Technical Features\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; padding-left: 1.5rem; margin-bottom: 1.5rem;\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual-Function Assembly:\u003c\/strong\u003e Houses 2 analog inputs and 2 analog outputs within a unified physical terminal channel structure.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBipolar Voltage Range:\u003c\/strong\u003e Configured for high-precision -10 to +10 V signal ranges, optimizing control for actuators and bi-directional sensors.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePluggable Wiring Level:\u003c\/strong\u003e Tool-less terminal block detachment design simplifies on-site hardware maintenance cycles.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectrical Isolation:\u003c\/strong\u003e Features 500 V galvanic isolation between the internal K-bus and the field-side analog circuits.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEfficient Power Sourcing:\u003c\/strong\u003e Low typical current consumption of 70 mA directly from the K-bus internal logical supply line.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color: #1a365d; border-bottom: 2px solid #2b6cb0; padding-bottom: 0.25rem;\"\u003eIndustrial Applications\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; padding-left: 1.5rem; margin-bottom: 1.5rem;\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProportional Valve Control:\u003c\/strong\u003e Standard interfacing for industrial hydraulics and pneumatic positioners requiring bipolar signal drives.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClosed-Loop Speed Control:\u003c\/strong\u003e Synchronizing feedback from variable frequency drives (VFDs) and positioning tachometers.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOEM Machine Integration:\u003c\/strong\u003e Compact multi-channel signal routing inside standard manufacturing cells with restricted installation footprint.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHVAC Damper Actuation:\u003c\/strong\u003e Controlling electronic draft dampers and air handler systems using standard voltage loops.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"color: #1a365d; border-bottom: 2px solid #2b6cb0; padding-bottom: 0.25rem;\"\u003eTechnical Specifications Table\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; width: 100%; margin-bottom: 1.5rem;\"\u003e\n  \u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748; border: 1px solid #e2e8f0;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"border-bottom: 2px solid #2b6cb0; text-align: left;\"\u003e\n        \u003cth style=\"padding: 0.75rem; font-weight: bold;\"\u003eParameter Name\u003c\/th\u003e\n        \u003cth style=\"padding: 0.75rem; font-weight: bold;\"\u003eValue Specification\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eManufacturer\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eBeckhoff Automation GmbH \u0026amp; Co. KG\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eModel Designation\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eKS4494\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eTerminal Style\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003ePluggable connection level (KS Series)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eInput \/ Output Count\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e2 Analog Inputs \/ 2 Analog Outputs\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eAnalog Signal Type\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eSingle-ended, -10 to +10 V\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eResolution\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e12-bit binary\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eConversion Time\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e\u0026lt; 2 ms\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eOutput Error Margin\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e\u0026lt; +\/-0.3% (relative to full scale)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eInternal Input Resistance\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e\u0026gt; 130 kOhm\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eOutput Load Limit\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e\u0026gt; 5 kOhm (short-circuit proof)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eCurrent Draw (K-Bus)\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003etyp. 70 mA\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eIsolation Voltage\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e500 V (K-bus to signal potential)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eConductor Connection Type\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eSpring-actuated cage clamps\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eWire Cross-Section\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eSolid\/Stranded: 0.08...1.5 mm2 (AWG 28...16)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eHousing Material\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003ePolycarbonate, flame-retardant\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eOperating Temperature\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e0 to +55 degC\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eDimensions (W x H x D)\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e12 mm x 100 mm x 68 mm\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eNet Module Weight\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e0.055 kg\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eShipping Weight (Calculated)\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e2.00 kg (with reinforced industrial protective packaging)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eCountry of Origin\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eGermany\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3 style=\"color: #1a365d; border-bottom: 2px solid #2b6cb0; padding-bottom: 0.25rem;\"\u003eConnections and Interfaces\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; width: 100%; margin-bottom: 1.5rem;\"\u003e\n  \u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748; border: 1px solid #e2e8f0;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"border-bottom: 2px solid #2b6cb0; text-align: left;\"\u003e\n        \u003cth style=\"padding: 0.75rem; font-weight: bold;\"\u003eTerminal Contact Point\u003c\/th\u003e\n        \u003cth style=\"padding: 0.75rem; font-weight: bold;\"\u003eSignal Assignment\u003c\/th\u003e\n        \u003cth style=\"padding: 0.75rem; font-weight: bold;\"\u003eFunctional Circuit Details\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eContact 1\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eInput 1 (+)\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eAnalog input channel 1 signal line (-10 to +10 V)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eContact 2\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eOutput 1 (+)\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eAnalog output channel 1 control line (-10 to +10 V)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eContact 3\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e0 V (Input 1 Ref)\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eCommon reference return path for Input 1\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eContact 4\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e0 V (Output 1 Ref)\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eCommon reference return path for Output 1\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eContact 5\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eInput 2 (+)\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eAnalog input channel 2 signal line (-10 to +10 V)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eContact 6\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eOutput 2 (+)\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eAnalog output channel 2 control line (-10 to +10 V)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eContact 7\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e0 V (Input 2 Ref)\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eCommon reference return path for Input 2\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.75rem; font-weight: bold;\"\u003eContact 8\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003e0 V (Output 2 Ref)\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.75rem;\"\u003eCommon reference return path for Output 2\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3 style=\"color: #1a365d; border-bottom: 2px solid #2b6cb0; padding-bottom: 0.25rem;\"\u003eEmpirical Engineering Insights\u003c\/h3\u003e\n\u003ch4 style=\"color: #2b6cb0; margin-top: 1rem; margin-bottom: 0.5rem;\"\u003eAlternative Models \u0026amp; Compatibility\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eThe KS4494 serves as the direct physical drop-in equivalent to the standard Beckhoff KL4494 bus terminal block. While the KL4494 utilizes static cage clamps, the KS4494 integrates a split, multi-pin pluggable front interface. Both terminals share the exact same TwinCAT XML device description (GSDML\/EDS configurations) and use identical 2 x 16-bit input and 2 x 16-bit output process images, requiring zero modifications to controller logic during hardware modernization programs.\u003c\/p\u003e\n\n\u003ch4 style=\"color: #2b6cb0; margin-top: 1rem; margin-bottom: 0.5rem;\"\u003eApplication Pitfalls \u0026amp; Engineering Notes\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eBecause this module utilizes a single-ended signal configuration with internal reference ground links, field instrumentation sharing common paths can introduce signal skewing. When routing cables across long industrial enclosures, ground loops might compromise the 12-bit ADC digitization stability. Ensure external transmitters and current loads share a zero-volt potential close to the terminal group or deploy isolation barriers if signal noise spikes are detected in TwinCAT Scope.\u003c\/p\u003e\n\n\u003ch4 style=\"color: #2b6cb0; margin-top: 1rem; margin-bottom: 0.5rem;\"\u003eCommissioning \u0026amp; Wiring Tips\u003c\/h4\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1.5rem;\"\u003eUse a standard 3.0 mm flat-head terminal screwdriver to actuate the spring contacts. We highly recommend using shielded twisted pair (STP) cabling for all -10 to +10 V connections, grounding the shield exclusively at the cabinet side's main grounding busbar. During initial startup, map variables within TwinCAT to monitor the raw register values, where standard hexadecimal limits represent the bipolar physical boundaries.\u003c\/p\u003e\n\n\u003ch3 style=\"color: #1a365d; border-bottom: 2px solid #2b6cb0; padding-bottom: 0.25rem;\"\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cdiv style=\"background-color: #fff5f5; border-left: 4px solid #c53030; padding: 1rem; margin-bottom: 1.5rem;\"\u003e\n  \u003cp style=\"color: #9b2c2c; font-weight: bold; margin: 0 0 0.5rem 0;\"\u003eCRITICAL SYSTEM INTEGRITY WARNING\u003c\/p\u003e\n  \u003cp style=\"color: #9b2c2c; margin: 0; font-size: 0.95rem;\"\u003eAlways isolate all field-side and logic-side power supplies before mounting, dismounting, or inserting\/extracting the pluggable terminal blocks. Failure to de-energize the K-bus backplane can lead to physical arc damage or disrupt adjacent backplane communications, triggering a bus controller watchdog shutdown.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"display: flex; flex-direction: column; gap: 1rem; color: #2d3748;\"\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; flex-shrink: 0;\"\u003e1\u003c\/div\u003e\n    \u003cdiv\u003eAlign the slide-and-key guide mechanism on the side panel of the KS4494 with the adjacent bus terminal of your installation layout.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; flex-shrink: 0;\"\u003e2\u003c\/div\u003e\n    \u003cdiv\u003ePress down firmly on the DIN rail carrier until the lock clip securely engages with the 35 mm mounting rail (conforming to EN 60715).\u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; gap: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; width: 28px; height: 28px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; flex-shrink: 0;\"\u003e3\u003c\/div\u003e\n    \u003cdiv\u003eInsert the pre-wired pluggable wiring block into the front socket interface of the module until it clicks securely into place.\u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"BECKHOFF","offers":[{"title":"Default Title","offer_id":53106527011179,"sku":"KS4494","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/ks4494-vwcjojfaf5u.png?v=1776245326","url":"https:\/\/www.plcprotech.com\/id\/products\/beckhoff-ks4494-bus-terminal-analog-input-output-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}