{"product_id":"siemens-7mh4138-6aa00-0ba0-siwarex-wp321-st-weighing-module","title":"Siemens 7MH4138-6AA00-0BA0 SIWAREX WP321 ST Weighing Module","description":"\u003ch2\u003eSiemens 7MH4138-6AA00-0BA0 SIWAREX WP321 ST Weighing Module\u003c\/h2\u003e\n\u003cp\u003eConfigured for precision load cell interface execution in SIMATIC ET 200SP platforms, the \u003cstrong\u003eSiemens 7MH4138-6AA00-0BA0\u003c\/strong\u003e (\u003cstrong\u003e7MH4138-6AA00-0BA0\u003c\/strong\u003e SIWAREX WP321 ST Weighing Module) provides direct physical\/electrical execution. This single-channel electronic module directly processes signals from analog strain gauge full bridges (1-4 mV\/V) with high measurement resolution across industrial process control loops. The unit mounts on ET 200SP BaseUnit Type A0 racks, transmitting digitized weight values across the backplane bus while offering an RS485 port for direct configuration or diagnostic monitoring.\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\u003e7MH4138-6AA00-0BA0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSiemens\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eGermany\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.20 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e15 x 73 x 58 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-25 to +60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e24 VDC backplane bus supply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Series\u003c\/td\u003e\n\u003ctd\u003eSIWAREX WP321 ST\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Compatibility\u003c\/td\u003e\n\u003ctd\u003eSIMATIC ET 200SP (BaseUnit Type A0)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMeasurement Resolution\u003c\/td\u003e\n\u003ctd\u003eUp to +\/- 2 million parts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface Ports\u003c\/td\u003e\n\u003ctd\u003e1 x RS485, 1 x Load Cell Input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eSiemens Drive \u0026amp; Control System Characteristics\u003c\/h3\u003e\n\u003cp\u003eThe 7MH4138-6AA00-0BA0 leverages direct backplane integration within the ET 200SP I\/O system to eliminate external signal conversion delays and maintain high control loop determinism. To ensure tight integration with SIMATIC CPUs, the module features:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBackplane bus communication velocity optimization for rapid transfer of digitized weight and status register data to host logic controllers.\u003c\/li\u003e\n\u003cli\u003eNative firmware flash compatibility across SIMATIC S7 controllers via TIA Portal and Step 7 configuration libraries.\u003c\/li\u003e\n\u003cli\u003eDense I\/O density scaling on standard 15 mm BaseUnits without requiring dedicated external weighing transmitters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Which BaseUnit footprint is required for mounting the SIWAREX WP321 ST?\u003c\/p\u003e\n\u003cp\u003eA: The module requires an ET 200SP BaseUnit Type A0, which provides the integrated terminal connections for load cell wiring and internal backplane power routing.\u003c\/p\u003e\n\u003cp\u003eQ: Can engineers calibrate the SIWAREX WP321 ST without applying physical test weights?\u003c\/p\u003e\n\u003cp\u003eA: Yes. Theoretical calibration can be executed via SIWATOOL configuration software by keying in the characteristic output ratings (mV\/V) and nominal load cell parameters.\u003c\/p\u003e\n\u003cp\u003eQ: How many individual load cells can wire into a single WP321 ST module input channel?\u003c\/p\u003e\n\u003cp\u003eA: Up to four 350-ohm analog strain gauge load cells can connect in parallel to the single input channel using an external junction box.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003ePerform all installation and terminal wiring work under complete power isolation. Disconnect the main supply and confirm that all 24 VDC backplane power feeds to the ET 200SP rack are de-energized.\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eVerify that the targeted rack position contains a standard BaseUnit Type A0 before inserting the module.\u003c\/li\u003e\n\u003cli\u003eAlign the 7MH4138-6AA00-0BA0 with the BaseUnit guide slot and press firmly until the mechanical locking latch engages.\u003c\/li\u003e\n\u003cli\u003eRoute load cell wiring through shielded cables, landing individual conductors on the BaseUnit spring-clamp terminals according to the terminal diagram.\u003c\/li\u003e\n\u003cli\u003eConnect the cable shield directly to the ET 200SP shield connection element to minimize common-mode noise on delicate strain gauge signals.\u003c\/li\u003e\n\u003cli\u003eApply power to the ET 200SP assembly and initiate parameter setup via TIA Portal or SIWATOOL over the RS485 interface.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":43914613129315,"sku":"7MH4138-6AA00-0BA0","price":400.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/5246\/8067\/files\/84._08427f38-b535-48e3-a434-1f9bc68bbf6d.jpg?v=1766624186","url":"https:\/\/www.autocontrolglobal.com\/products\/siemens-7mh4138-6aa00-0ba0-siwarex-wp321-st-weighing-module","provider":"AutoControl Global","version":"1.0","type":"link"}