{"id":51499,"date":"2026-08-04T20:18:11","date_gmt":"2026-08-04T12:18:11","guid":{"rendered":"https:\/\/www.modbus.cn\/51499.html"},"modified":"2026-08-04T20:18:11","modified_gmt":"2026-08-04T12:18:11","slug":"visualhmi-modbus-%e4%b8%80%e4%b8%bb%e5%a4%9a%e4%bb%8e%ef%bc%9astart_read-%e8%bd%ae%e8%af%a2%e3%80%81cycle-%e8%b0%83%e5%ba%a6%e4%b8%8e%e8%af%bb%e5%86%99%e4%bb%8e%e6%9c%ba","status":"publish","type":"post","link":"http:\/\/www.modbus.cn\/en\/51499.html","title":{"rendered":"VisualHMI Modbus \u4e00\u4e3b\u591a\u4ece\uff1astart_read \u8f6e\u8be2\u3001cycle \u8c03\u5ea6\u4e0e\u8bfb\u5199\u4ece\u673a"},"content":{"rendered":"

HMI \u505a\u4e3b\u7ad9\uff08Modbus Master \/ FX2N \/ FX3U \u4e3b\u7ad9\u6a21\u5f0f\uff09\u65f6\uff0c\u7528 start_read<\/code> \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<\/p>\n

1. start_read\uff1a\u540e\u53f0\u81ea\u52a8\u8f6e\u8be2<\/h2>\n
start_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())<\/pre>\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)<\/code> \u76f4\u63a5\u8bfb\u7f13\u5b58\uff0c\u65e0\u901a\u4fe1\u5ef6\u8fdf<\/strong>\u3002<\/p>\n
\"VisualHMI<\/p>\n
2. cycle \u4e0e cycle_run\uff1a\u9ad8\u4f4e\u9891\u4efb\u52a1\u8c03\u5ea6<\/h2>\n
HMI \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<\/p>\n\n\n\n\n
\u8c03\u7528<\/th>\n\u884c\u4e3a<\/th>\n<\/tr>\n
start_read(0, VT_4x, 0x1000, 10)<\/td>\n\u6bcf\u4e2a\u901a\u4fe1\u5468\u671f\u90fd\u8bfb 4×1000~1009\uff08\u9ad8\u9891\uff09<\/td>\n<\/tr>\n
start_read(1, VT_4x, 0x2000, 10, 3, 2)<\/td>\n\u6bcf 3 \u4e2a\u5468\u671f\u8bfb\u4e00\u6b21\uff0c\u4e14\u5728\u7b2c 3 \u4e2a\u5468\u671f\u6267\u884c\uff08\u4f4e\u9891\uff09<\/td>\n<\/tr>\n<\/table>\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<\/p>\n
3. \u8bfb\u5199\u4ece\u673a\u5bc4\u5b58\u5668<\/h2>\n
3.1 \u8bfb\uff08\u7f13\u5b58\u76f4\u8bfb\uff09<\/h3>\n
local 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)<\/pre>\n
3.2 \u5199<\/h3>\n
set_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)<\/pre>\n
3.3 \u6279\u91cf\u5199\u5bc4\u5b58\u5668<\/h3>\n
local tb = {1, 2, 3, 4, 5}\nset_array(VT_4x, 0x1010, tb)          -- \u8868\u65b9\u5f0f\u6279\u91cf\u5199<\/pre>\n
4. \u591a\u4ece\u7ad9\uff08\u4e00\u4e3b\u591a\u4ece\uff09<\/h2>\n
\u9879\u76ee\u521b\u5efa\u4e24\u4e2a\u4ece\u7ad9\uff0c\u7ad9\u53f7 10 \u548c 20\u3002\u8bfb\u5199\u524d\u7528 select_slave()<\/code> \u5207\u6362\u5f53\u524d\u4ece\u673a\uff0c\u6216\u7528 set_slave_site()<\/code> \u5efa\u7acb\u7d22\u5f15\u5230\u7ad9\u53f7\u7684\u6620\u5c04\uff1a<\/p>\n
set_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)<\/pre>\n
\"VisualHMI<\/p>\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<\/strong>\u3002<\/div>\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<\/p>\n<\/span>","protected":false},"excerpt":{"rendered":"
HMI \u505a\u4e3b\u7ad9\uff08Modbus Master \/ FX2N \/…<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[3131,3126],"tags":[1083,3146,3147,3134,3145,1597,1644],"class_list":["post-51499","post","type-post","status-publish","format-standard","hentry","category-hmi-lua","category-hmi-dev","tag-modbus","tag-select_slave","tag-start_read","tag-visualhmi","tag-3145","tag-1597","tag-1644"],"_links":{"self":[{"href":"http:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/posts\/51499","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/comments?post=51499"}],"version-history":[{"count":0,"href":"http:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/posts\/51499\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/media?parent=51499"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/categories?post=51499"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/tags?post=51499"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}