{"product_id":"fanuc-from-sram-module-for-16i-18i-21i-a20b-3900-0161","title":"Fanuc FROM\/SRAM module for 16i\/ 18i\/ 21i A20B-3900-0161","description":"\u003cp data-start=\"0\" data-end=\"261\"\u003e\u003cstrong data-start=\"0\" data-end=\"41\"\u003e\u003cspan class=\"inline align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003e\u003cspan class=\"hover:entity-accent entity-underline cursor-pointer\"\u003eFANUC A20B‑3900‑0161\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e is a \u003cstrong data-start=\"47\" data-end=\"84\"\u003ememory module (FROM + SRAM board)\u003c\/strong\u003e used in industrial \u003cstrong data-start=\"104\" data-end=\"129\"\u003eFANUC CNC controllers\u003c\/strong\u003e — it’s part of the controller’s internal electronics that stores essential firmware and data. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-start=\"263\" data-end=\"298\"\u003e📌 What \u003cstrong data-start=\"275\" data-end=\"293\"\u003eA20B‑3900‑0161\u003c\/strong\u003e Is\u003c\/h3\u003e\n\u003cul data-start=\"299\" data-end=\"1101\"\u003e\n\u003cli data-start=\"299\" data-end=\"610\"\u003e\n\u003cp data-start=\"301\" data-end=\"610\"\u003e\u003cstrong data-start=\"301\" data-end=\"333\"\u003eMemory Module (FROM + SRAM):\u003c\/strong\u003e This printed circuit board contains \u003cstrong data-start=\"370\" data-end=\"412\"\u003e16 MB of Flash Read‑Only Memory (FROM)\u003c\/strong\u003e and \u003cstrong data-start=\"417\" data-end=\"446\"\u003e2 MB of Static RAM (SRAM)\u003c\/strong\u003e. This combination allows the CNC controller to hold core firmware, configuration, and runtime data necessary for operation. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"611\" data-end=\"910\"\u003e\n\u003cp data-start=\"613\" data-end=\"910\"\u003e\u003cstrong data-start=\"613\" data-end=\"633\"\u003eRole in the CNC:\u003c\/strong\u003e It plugs into the controller’s main board (master control PCB) and works alongside CPU boards, servo\/axis cards, and I\/O modules to make the controller function properly. When missing or faulty, the CNC may fail to boot or run reliably. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"911\" data-end=\"1101\"\u003e\n\u003cp data-start=\"913\" data-end=\"1101\"\u003e\u003cstrong data-start=\"913\" data-end=\"939\"\u003eTypical Compatibility:\u003c\/strong\u003e Used in FANUC \u003cstrong data-start=\"954\" data-end=\"978\"\u003ei‑Series controllers\u003c\/strong\u003e such as \u003cem data-start=\"987\" data-end=\"992\"\u003e16i\u003c\/em\u003e, \u003cem data-start=\"994\" data-end=\"999\"\u003e18i\u003c\/em\u003e, and \u003cem data-start=\"1005\" data-end=\"1010\"\u003e21i\u003c\/em\u003e models where this kind of memory module is required. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"1103\" data-end=\"1131\"\u003e🧠 Key Characteristics\u003c\/h3\u003e\n\u003cul data-start=\"1132\" data-end=\"1663\"\u003e\n\u003cli data-start=\"1132\" data-end=\"1245\"\u003e\n\u003cp data-start=\"1134\" data-end=\"1245\"\u003e🧾 \u003cstrong data-start=\"1137\" data-end=\"1158\"\u003eFROM (Flash ROM):\u003c\/strong\u003e Stores essential firmware and system programs. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1246\" data-end=\"1358\"\u003e\n\u003cp data-start=\"1248\" data-end=\"1358\"\u003e⚡ \u003cstrong data-start=\"1250\" data-end=\"1259\"\u003eSRAM:\u003c\/strong\u003e Provides working memory for data during machine operation. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1359\" data-end=\"1498\"\u003e\n\u003cp data-start=\"1361\" data-end=\"1498\"\u003e🔌 \u003cstrong data-start=\"1364\" data-end=\"1383\"\u003ePlug‑in Module:\u003c\/strong\u003e Typically connects to the controller’s main PCB via a socket or backplane. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1499\" data-end=\"1663\"\u003e\n\u003cp data-start=\"1501\" data-end=\"1663\"\u003e🛠️ \u003cstrong data-start=\"1505\" data-end=\"1525\"\u003eInterchangeable:\u003c\/strong\u003e Often available as new, refurbished, or repaired units from third‑party industrial parts suppliers. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"1665\" data-end=\"1689\"\u003e📍 Practical Notes\u003c\/h3\u003e\n\u003cul data-start=\"1690\" data-end=\"2203\"\u003e\n\u003cli data-start=\"1690\" data-end=\"1841\"\u003e\n\u003cp data-start=\"1692\" data-end=\"1841\"\u003eThis part is \u003cstrong data-start=\"1705\" data-end=\"1730\"\u003ediscontinued by FANUC\u003c\/strong\u003e, but still widely used as a replacement or spare in older CNC systems. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1842\" data-end=\"2037\"\u003e\n\u003cp data-start=\"1844\" data-end=\"2037\"\u003eIf replacing it, make sure you have \u003cstrong data-start=\"1880\" data-end=\"1930\"\u003ebackups of machine parameters and program data\u003c\/strong\u003e, as swapping memory modules can lead to loss of stored settings. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2038\" data-end=\"2203\"\u003e\n\u003cp data-start=\"2040\" data-end=\"2203\"\u003eMany suppliers offer \u003cstrong data-start=\"2061\" data-end=\"2099\"\u003erepair or remanufacturing services\u003c\/strong\u003e to restore a faulty board to working condition with a warranty. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JJAutomation","offers":[{"title":"New","offer_id":44832928071816,"sku":"A20B-3900-0161","price":0.0,"currency_code":"INR","in_stock":true},{"title":"Used \/ Refurbished","offer_id":46109847126152,"sku":"A20B-3900-0161","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-2026-02-24T141333.204.jpg?v=1771922621","url":"https:\/\/jjautomation.in\/products\/fanuc-from-sram-module-for-16i-18i-21i-a20b-3900-0161","provider":"JJAutomation","version":"1.0","type":"link"}