{"product_id":"fanuc-from-sram-module-for-16i-18i-21i-a20b-3900-0180","title":"Fanuc FROM\/SRAM module for 16i\/ 18i\/ 21i A20B-3900-0180","description":"\u003cp data-start=\"76\" data-end=\"343\"\u003e\u003cstrong data-start=\"76\" data-end=\"94\"\u003eA20B-3900-0180\u003c\/strong\u003e is an \u003cstrong data-start=\"101\" data-end=\"140\"\u003einternal memory board (FROM + SRAM)\u003c\/strong\u003e used in various FANUC CNC controllers. It stores essential system firmware and battery-backed runtime\/parameter data that the controller needs to operate correctly. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-start=\"345\" data-end=\"364\"\u003e📌 What It Is\u003c\/h3\u003e\n\u003cul data-start=\"365\" data-end=\"822\"\u003e\n\u003cli data-start=\"365\" data-end=\"402\"\u003e\n\u003cp data-start=\"367\" data-end=\"402\"\u003e\u003cstrong data-start=\"367\" data-end=\"383\"\u003ePart Number:\u003c\/strong\u003e \u003cem data-start=\"384\" data-end=\"400\"\u003eA20B-3900-0180\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"403\" data-end=\"450\"\u003e\n\u003cp data-start=\"405\" data-end=\"450\"\u003e\u003cstrong data-start=\"405\" data-end=\"414\"\u003eType:\u003c\/strong\u003e \u003cstrong data-start=\"415\" data-end=\"448\"\u003eFROM\/SRAM memory module (PCB)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"451\" data-end=\"685\"\u003e\n\u003cp data-start=\"453\" data-end=\"472\"\u003e\u003cstrong data-start=\"453\" data-end=\"470\"\u003eMemory Specs:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"475\" data-end=\"685\"\u003e\n\u003cli data-start=\"475\" data-end=\"562\"\u003e\n\u003cp data-start=\"477\" data-end=\"562\"\u003e\u003cstrong data-start=\"477\" data-end=\"498\"\u003eFROM (Flash ROM):\u003c\/strong\u003e 16 MB — contains the CNC controller’s core software\/firmware.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"565\" data-end=\"685\"\u003e\n\u003cp data-start=\"567\" data-end=\"685\"\u003e\u003cstrong data-start=\"567\" data-end=\"576\"\u003eSRAM:\u003c\/strong\u003e 256 KB — battery-backed memory that retains parameters and settings. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"686\" data-end=\"822\"\u003e\n\u003cp data-start=\"688\" data-end=\"822\"\u003e\u003cstrong data-start=\"688\" data-end=\"707\"\u003eProduct Series:\u003c\/strong\u003e FANUC \u003cstrong data-start=\"714\" data-end=\"727\"\u003eA20B-3900\u003c\/strong\u003e family of memory boards used in CNC control electronics. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"824\" data-end=\"860\"\u003e🧠 Function in CNC Controllers\u003c\/h3\u003e\n\u003cp data-start=\"861\" data-end=\"1111\"\u003eThis module sits inside the CNC controller electronics and provides both \u003cstrong data-start=\"934\" data-end=\"979\"\u003enon-volatile storage (FLASH) for firmware\u003c\/strong\u003e and \u003cstrong data-start=\"984\" data-end=\"1061\"\u003evolatile (but battery-backed) RAM for machine parameters and runtime data\u003c\/strong\u003e. Without it (or if it fails), the controller may:\u003c\/p\u003e\n\u003cul data-start=\"1112\" data-end=\"1271\"\u003e\n\u003cli data-start=\"1112\" data-end=\"1140\"\u003e\n\u003cp data-start=\"1114\" data-end=\"1140\"\u003eFail to boot up properly\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1141\" data-end=\"1190\"\u003e\n\u003cp data-start=\"1143\" data-end=\"1190\"\u003eLose machine configuration and parameter data\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1191\" data-end=\"1271\"\u003e\n\u003cp data-start=\"1193\" data-end=\"1271\"\u003eDisplay memory-related alarms on startup \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"1273\" data-end=\"1300\"\u003e🛠 Installation \u0026amp; Use\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli style=\"list-style-type: none;\"\u003e\n\u003cul data-start=\"1301\" data-end=\"1629\"\u003e\n\u003cli data-start=\"1301\" data-end=\"1421\"\u003e\n\u003cp data-start=\"1303\" data-end=\"1421\"\u003eIt typically \u003cstrong data-start=\"1316\" data-end=\"1386\"\u003eplugs into a memory slot on the main controller board or backplane\u003c\/strong\u003e alongside other control modules.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1422\" data-end=\"1629\"\u003e\n\u003cp data-start=\"1424\" data-end=\"1629\"\u003eWhen replacing this module, it’s important to \u003cstrong data-start=\"1470\" data-end=\"1514\"\u003erestore FROM files and parameter backups\u003c\/strong\u003e to the controller afterward; otherwise factory\/old parameters might be lost.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JJAutomation","offers":[{"title":"New","offer_id":44837698273416,"sku":"A20B-3900-0180","price":0.0,"currency_code":"INR","in_stock":true},{"title":"Used \/ Refurbished","offer_id":46109847289992,"sku":"A20B-3900-0180","price":0.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0660\/1903\/3224\/files\/WhatsAppImage2025-10-18at1.47.49PM-2026-02-25T124612.526.jpg?v=1772003780","url":"https:\/\/jjautomation.in\/products\/fanuc-from-sram-module-for-16i-18i-21i-a20b-3900-0180","provider":"JJAutomation","version":"1.0","type":"link"}