{"product_id":"6es5155-3ua21-rack-unit-siemens-simatic-s5","title":"Siemens 6ES5155-3UA21 Simatic S5 Rack Unit","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\u003cp\u003eThe Siemens 6ES5155-3UA21 is a 21-slot rack unit designed for the Simatic S5-135\/155 automation series. This centralized housing system serves as the structural and electrical backbone for industrial controllers, providing a stable, modular environment for CPU, I\/O, and communication modules. It is engineered for large-scale applications in heavy industry sectors, including steel production, automotive assembly, and chemical refining. The robust mechanical design minimizes vibrational stress on internal components, while the expansive slot configuration facilitates complex, multi-processor automation tasks and simplifies maintenance through modular component accessibility.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e21-slot capacity for high-density module integration\u003c\/li\u003e\n\u003cli\u003eDesigned for Simatic S5-135\/155 controller architecture\u003c\/li\u003e\n\u003cli\u003eRobust chassis for industrial environments\u003c\/li\u003e\n\u003cli\u003eOptimized for thermal dissipation within control cabinets\u003c\/li\u003e\n\u003cli\u003eIntegrated backplane bus for 5 VDC logic and 24 VDC peripheral power distribution\u003c\/li\u003e\n\u003cli\u003eSupports redundant and distributed control strategies\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eApplications\u003c\/h3\u003e\u003cp\u003eThis rack unit is intended for use in large-scale industrial automation systems requiring high-density I\/O and multi-processor configurations. It is a critical component for maintaining legacy Simatic S5 control infrastructures in sectors such as chemical processing, automotive manufacturing, and heavy metal production.\u003c\/p\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable border=\"1\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e6ES5155-3UA21\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Family\u003c\/td\u003e\n\u003ctd\u003eSimatic S5-135\/155\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSlot Capacity\u003c\/td\u003e\n\u003ctd\u003e21 Slots\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBus Voltage\u003c\/td\u003e\n\u003ctd\u003e5 VDC and 24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Current Rating\u003c\/td\u003e\n\u003ctd\u003e40 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to 60 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply Compatibility\u003c\/td\u003e\n\u003ctd\u003eExternal 24 VDC input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEnsure the rack is mounted in a clean, dry environment within an industrial control cabinet.\u003c\/li\u003e\n\u003cli\u003eMaintain adequate clearance around the unit to allow for proper airflow and thermal dissipation.\u003c\/li\u003e\n\u003cli\u003eVerify that the power supply is disconnected before inserting or removing any modules from the rack.\u003c\/li\u003e\n\u003cli\u003eEnsure all modules are fully seated and secured to the backplane to prevent intermittent connections.\u003c\/li\u003e\n\u003cli\u003eFollow standard ESD (Electrostatic Discharge) precautions when handling modules to prevent damage to sensitive electronic components.\u003c\/li\u003e\n\u003cli\u003eRoute signal and power cables separately to minimize electromagnetic interference (EMI).\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch3\u003eWhat is the primary function of the 6ES5155-3UA21 rack?\u003c\/h3\u003e\u003cp\u003eThe rack serves as the physical and electrical mounting chassis for Siemens Simatic S5-135\/155 series modules, providing the necessary backplane communication and power distribution for the controller system.\u003c\/p\u003e\u003ch3\u003eIs this rack compatible with other S5 series?\u003c\/h3\u003e\u003cp\u003eThis unit is specifically designed for the S5-135\/155 series. Please verify your specific controller model requirements before installation.\u003c\/p\u003e\u003ch3\u003eWhat is the maximum current capacity of the backplane?\u003c\/h3\u003e\u003cp\u003eThe backplane is rated for a maximum current of 40 A, supporting the power requirements of high-density module configurations.\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":50969379963132,"sku":"6ES5155-3UA21","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/wm_1_ec81e051-b6a4-44ff-a96c-44830413dd62.jpg?v=1786502340","url":"https:\/\/www.electronicplc.com\/products\/6es5155-3ua21-rack-unit-siemens-simatic-s5","provider":"Electronic PLC","version":"1.0","type":"link"}