"# VisualHMI Modbus \u4e00\u4e3b\u591a\u4ece\uff1astart_read \u8f6e\u8be2\u3001cycle \u8c03\u5ea6\u4e0e\u8bfb\u5199\u4ece\u673a\n\n> 2026-08-04 | 2026-08-04\n> http:\/\/www.modbus.cn\/en\/51499.html\n\n**LUA \u811a\u672c, \u4e32\u53e3\u5c4f\/HMI \u5f00\u53d1**\n\n---\n\nHMI \u505a\u4e3b\u7ad9\uff08Modbus Master \/ FX2N \/ FX3U \u4e3b\u7ad9\u6a21\u5f0f\uff09\u65f6\uff0c\u7528 `start_read` \u505a\u540e\u53f0\u81ea\u52a8\u8f6e\u8be2\u8bfb\u4ece\u673a\uff0c\u7528 set_xxx \u5199\u4ece\u673a\u3002\u8fd9\u7bc7\u8bb2\u4e3b\u4ece\u6a21\u5f0f\u4e0b\u7684\u8bfb\u5199\u5957\u8def\uff0c\u4ee5\u53ca\u591a\u4ece\u7ad9\u600e\u4e48\u8c03\u5ea6\u3002\n\n## 1. start_read\uff1a\u540e\u53f0\u81ea\u52a8\u8f6e\u8be2\n\n```\nstart_read(index, vtype, addr, quantity, cycle, cycle_run, mode)\n-- index:    \u4efb\u52a1\u7d22\u5f15\u53f7 0~127, \u7528\u4e8e stop_read(index) \u505c\u6b62\n-- vtype:    \u6570\u636e\u7c7b\u578b VT_3x\/VT_4x\/VT_0x...\n-- addr:     \u8d77\u59cb\u5bc4\u5b58\u5668\u5730\u5740\n-- quantity: \u8bfb\u53d6\u6570\u91cf 1~120 \u4e2a\u5bc4\u5b58\u5668\n-- cycle:    \u8f6e\u8be2\u5468\u671f\u500d\u6570(\u9ed8\u8ba40=\u6bcf\u4e2a\u901a\u4fe1\u5468\u671f\u90fd\u8bfb)\n-- cycle_run:\u5468\u671f\u5185\u7b2c\u51e0\u6b21\u6267\u884c(0-based, \u9700 < cycle)\n-- mode:     0=\u6301\u7eed\u5468\u671f\u8bfb\u53d6(\u9ed8\u8ba4), 1=\u4ec5\u8bfb\u4e00\u6b21(\u9700\u5148 create_resp_que())\n```\n\n\u8c03\u7528\u540e HMI \u628a\u8be5\u4efb\u52a1\u52a0\u5165\u901a\u4fe1\u8c03\u5ea6\u961f\u5217\uff0c\u6bcf\u4e2a\u901a\u4fe1\u5468\u671f\u81ea\u52a8\u53d1 Modbus \u8bf7\u6c42\uff0c\u8fd4\u56de\u6570\u636e\u5199\u5165\u5185\u5b58\u955c\u50cf\u3002\u811a\u672c\u7528 `get_uint16(VT_4x, addr)` \u76f4\u63a5\u8bfb\u7f13\u5b58\uff0c**\u65e0\u901a\u4fe1\u5ef6\u8fdf**\u3002\n\n![\u4e00\u4e3b\u591a\u4ece\u914d\u7f6e](https:\/\/www.modbus.cn\/wp-content\/uploads\/2026\/08\/visualhmi\/lu003_1.png)\n\n## 2. cycle \u4e0e cycle_run\uff1a\u9ad8\u4f4e\u9891\u4efb\u52a1\u8c03\u5ea6\n\nHMI \u628a\u901a\u4fe1\u5468\u671f\u5212\u5206\u4e3a\u591a\u4e2a\u5b50\u5468\u671f\uff0c\u7528\u6765\u533a\u5206\u9ad8\u9891\/\u4f4e\u9891\u4efb\u52a1\uff1a\n\n\u8c03\u7528\u884c\u4e3astart_read(0, VT_4x, 0x1000, 10)\u6bcf\u4e2a\u901a\u4fe1\u5468\u671f\u90fd\u8bfb 4x1000~1009\uff08\u9ad8\u9891\uff09start_read(1, VT_4x, 0x2000, 10, 3, 2)\u6bcf 3 \u4e2a\u5468\u671f\u8bfb\u4e00\u6b21\uff0c\u4e14\u5728\u7b2c 3 \u4e2a\u5468\u671f\u6267\u884c\uff08\u4f4e\u9891\uff09\n\n\u8c03\u5ea6\u65f6\u5e8f\uff1a\u5468\u671f#0\uff080ms\uff09\u8bfb 0x1000\uff08\u9ad8\u9891\u4efb\u52a1\uff09\uff1b\u5468\u671f#1 \u518d\u8bfb 0x1000\uff1b\u5468\u671f#2 \u8bfb 0x1000 + 0x2000\uff08\u4f4e\u9891\u4efb\u52a1\u5230\u70b9\uff09\u3002\u8fd9\u6837\u628a\u4e0d\u540c\u5b9e\u65f6\u6027\u8981\u6c42\u7684\u6570\u636e\u9519\u5f00\uff0c\u907f\u514d\u603b\u7ebf\u62e5\u5835\u3002\n\n## 3. \u8bfb\u5199\u4ece\u673a\u5bc4\u5b58\u5668\n\n### 3.1 \u8bfb\uff08\u7f13\u5b58\u76f4\u8bfb\uff09\n\n```\nlocal v = get_uint16(VT_4x, 0x1000)   -- \u8bfb\u4fdd\u6301\u5bc4\u5b58\u5668\nlocal f = get_float(VT_4x, 0x1002)    -- \u8bfb\u5355\u7cbe\u5ea6\u6d6e\u70b9(\u53602\u5bc4\u5b58\u5668)\n```\n\n### 3.2 \u5199\n\n```\nset_uint16(VT_4x, 0x1000, 100)        -- \u5199\u4fdd\u6301\u5bc4\u5b58\u5668(\u529f\u80fd\u780106)\nset_uint16_ex(VT_4x, 0x1010, 1,2,3,4) -- \u6279\u91cf\u5199(\u529f\u80fd\u780110)\n```\n\n### 3.3 \u6279\u91cf\u5199\u5bc4\u5b58\u5668\n\n```\nlocal tb = {1, 2, 3, 4, 5}\nset_array(VT_4x, 0x1010, tb)          -- \u8868\u65b9\u5f0f\u6279\u91cf\u5199\n```\n\n## 4. \u591a\u4ece\u7ad9\uff08\u4e00\u4e3b\u591a\u4ece\uff09\n\n\u9879\u76ee\u521b\u5efa\u4e24\u4e2a\u4ece\u7ad9\uff0c\u7ad9\u53f7 10 \u548c 20\u3002\u8bfb\u5199\u524d\u7528 `select_slave()` \u5207\u6362\u5f53\u524d\u4ece\u673a\uff0c\u6216\u7528 `set_slave_site()` \u5efa\u7acb\u7d22\u5f15\u5230\u7ad9\u53f7\u7684\u6620\u5c04\uff1a\n\n```\nset_slave_site(0, 10)   -- \u7d22\u5f150 = \u7ad9\u53f710\nset_slave_site(1, 20)   -- \u7d22\u5f151 = \u7ad9\u53f720\nselect_slave(0)         -- \u5207\u5230\u4ece\u7ad910\nset_uint16(VT_4x, 0x0000, 1)\nselect_slave(1)         -- \u5207\u5230\u4ece\u7ad920\nlocal v = get_uint16(VT_4x, 0x1000)\n```\n\n![\u591a\u4ece\u7ad9\u8bfb\u5199](https:\/\/www.modbus.cn\/wp-content\/uploads\/2026\/08\/visualhmi\/lu003_2.png)\n\n\u4e00\u4e3b\u591a\u4ece\u7684\u5173\u952e\uff1a**\u2460start_read \u7684 index \u662f\u4efb\u52a1\u7d22\u5f15\u4e0d\u662f\u7ad9\u53f7\uff0c\u505c\u6b62\u7528 stop_read(index)\uff1b\u2461\u4ece\u7ad9\u5207\u6362\u540e\u8bfb\u5199\u8981\u91cd\u65b0 select_slave\uff1b\u2462\u9ad8\u9891\u6570\u636e\u7528\u77ed\u5468\u671f\u3001\u4f4e\u9891\u6570\u636e\u7528 cycle \u500d\u6570\u9519\u5f00\uff0c\u4e0d\u7136\u603b\u7ebf\u4e0a\u5168\u662f HMI \u7684\u8bf7\u6c42\u5e27**\u3002\n\n\u6574\u7406\u81ea \u5e7f\u5dde\u5927\u5f69\u79d1\u6280 VisualHMI \u5f00\u53d1\u6587\u6863\uff08hmi-doc.gz-dc.com\uff09LUA \u6559\u7a0b\u300cModbus \u4e00\u4e3b\u591a\u4ece\u300d\uff0c\u7248\u6743\u5f52\u5927\u5f69\u79d1\u6280\u6240\u6709\u3002\n\n---\n*modbus.cn*\n"