{"product_id":"siemens-simatic-s5-6es5-946-3ua21-cpu-module","title":"Siemens 6ES5946-3UA21 Simatic S5 CPU 946 Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\u003cp\u003eThe Siemens 6ES5946-3UA21 (CPU 946) is a high-performance central processing unit designed for the Simatic S5-135U and S5-155U programmable logic controller systems. Engineered for demanding industrial applications, this module provides robust logic execution, efficient instruction processing, and support for complex multi-processing configurations. It is widely utilized in large-scale automation environments, including power generation, chemical processing, and heavy industrial manufacturing, where deterministic control and high reliability are critical for maintaining continuous production cycles.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eHigh-speed processing architecture optimized for sub-millisecond instruction execution.\u003c\/li\u003e\n\u003cli\u003e128 KB of integrated RAM for program storage and data management.\u003c\/li\u003e\n\u003cli\u003eDesigned for seamless integration into S5-135U and S5-155U multiprocessor backplane environments.\u003c\/li\u003e\n\u003cli\u003eOnboard LED diagnostic indicators for real-time monitoring of RUN, STOP, and HALT operational states.\u003c\/li\u003e\n\u003cli\u003eAdvanced bus driver technology for enhanced noise immunity in high-EMI industrial environments.\u003c\/li\u003e\n\u003cli\u003eSupports complex closed-loop control algorithms and extensive I\/O addressing.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e6ES5946-3UA21\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eSimatic S5-135U \/ S5-155U\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMemory\u003c\/td\u003e\n\u003ctd\u003e128 KB Integrated RAM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstruction Speed\u003c\/td\u003e\n\u003ctd\u003eApprox 0.1 ms per 1000 instructions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e18.0 W (via backplane)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 to 70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelative Humidity\u003c\/td\u003e\n\u003ctd\u003e5 to 95% non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEnsure the PLC rack is powered down before inserting or removing the CPU module to prevent electrical damage.\u003c\/li\u003e\n\u003cli\u003eVerify that the module is correctly seated in the designated CPU slot of the S5 backplane to ensure proper bus contact.\u003c\/li\u003e\n\u003cli\u003eMaintain adequate ventilation around the rack to keep operating temperatures within the specified 0 to 60 deg C range.\u003c\/li\u003e\n\u003cli\u003eUse shielded communication cables where applicable to minimize electromagnetic interference.\u003c\/li\u003e\n\u003cli\u003eHandle the module using standard ESD (Electrostatic Discharge) protection practices to prevent damage to internal circuitry.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch3\u003eWhat is the primary function of the 6ES5946-3UA21?\u003c\/h3\u003e\u003cp\u003eThis module acts as the central processor for Siemens S5-135U and S5-155U systems, managing logic execution, I\/O communication, and complex control algorithms.\u003c\/p\u003e\u003ch3\u003eIs this module compatible with other S5 series PLCs?\u003c\/h3\u003e\u003cp\u003eThe CPU 946 is specifically designed for the S5-135U and S5-155U series. It is not intended for use in smaller S5 series racks.\u003c\/p\u003e\u003ch3\u003eWhat should I do if the CPU indicates a system error?\u003c\/h3\u003e\u003cp\u003eCheck the onboard diagnostic LEDs to identify the specific error state. Ensure the backplane connection is secure and that the power supply voltage is stable within the required parameters.\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":51008972226812,"sku":"6ES5946-3UA21","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/wm_1_593ba8c3-8f04-4a66-8567-2bf6a967a735.jpg?v=1787594121","url":"https:\/\/www.electronicplc.com\/products\/siemens-simatic-s5-6es5-946-3ua21-cpu-module","provider":"Electronic PLC","version":"1.0","type":"link"}