"# Modbus TCP\/IP \u7f51\u7edc\u90e8\u7f72\u6700\u4f73\u5b9e\u8df5\uff1a\u4ece\u5355\u673a\u8c03\u8bd5\u5230\u5de5\u4e1a\u4e91\u5e73\u53f0\u7684\u5b8c\u6574\u67b6\u6784\u6307\u5357\n\n> 2026-06-28 | 2026-06-28\n> https:\/\/www.modbus.cn\/en\/44508.html\n\n**\u672a\u5206\u7c7b**\n\n---\n\nModbus TCP\/IP \u7f51\u7edc\u90e8\u7f72\u6700\u4f73\u5b9e\u8df5\uff1a\u4ece\u5355\u673a\u8c03\u8bd5\u5230\u5de5\u4e1a\u4e91\u5e73\u53f0\u7684\u5b8c\u6574\u67b6\u6784\u6307\u5357\n\n**\u5173\u952e\u8bcd\uff1a**Modbus TCP \u90e8\u7f72\u3001Modbus TCP \u7f51\u7edc\u67b6\u6784\u3001\u5de5\u4e1a\u4ee5\u592a\u7f51\u3001Modbus \u7f51\u5173\u914d\u7f6e\u3001Modbus TCP \u4f18\u5316\n\n\u5f53\u5de5\u5382\u4ece\u300c\u5355\u673a\u81ea\u52a8\u5316\u300d\u8fc8\u5411\u300c\u7f51\u7edc\u5316\u751f\u4ea7\u300d\u65f6\uff0cModbus TCP \u662f\u8fde\u63a5\u73b0\u573a\u8bbe\u5907\u4e0e\u4e0a\u5c42\u4fe1\u606f\u7cfb\u7edf\u7684\u9996\u9009\u534f\u8bae\u3002\u7136\u800c\uff0c\u628a RS-485 \u6362\u6210\u7f51\u7ebf\u5e76\u4e0d\u7b49\u4e8e\u81ea\u52a8\u83b7\u5f97\u7a33\u5b9a\u53ef\u9760\u7684\u901a\u4fe1\u2014\u2014\u7f51\u7edc\u62d3\u6251\u8bbe\u8ba1\u3001IP \u89c4\u5212\u3001\u9632\u706b\u5899\u914d\u7f6e\u3001\u591a\u4e3b\u7ad9\u5e76\u53d1\u3001\u8d85\u65f6\u4e0e\u91cd\u8bd5\u7b56\u7565\uff0c\u4efb\u4f55\u4e00\u4e2a\u73af\u8282\u7684\u758f\u5ffd\u90fd\u53ef\u80fd\u5bfc\u81f4\u901a\u4fe1\u4e2d\u65ad\u751a\u81f3\u751f\u4ea7\u4e8b\u6545\u3002\n\n\u672c\u6587\u4ece\u7f51\u7edc\u5de5\u7a0b\u5e08\u548c\u81ea\u52a8\u5316\u5de5\u7a0b\u5e08\u7684\u53cc\u91cd\u89c6\u89d2\uff0c\u7cfb\u7edf\u5316\u5730\u68b3\u7406 Modbus TCP \u90e8\u7f72\u8fc7\u7a0b\u4e2d\u9700\u8981\u5173\u6ce8\u7684\u6240\u6709\u5173\u952e\u73af\u8282\uff0c\u5e76\u7ed9\u51fa\u53ef\u4ee5\u76f4\u63a5\u843d\u5730\u7684\u914d\u7f6e\u65b9\u6848\u3002\n\n## \u4e00\u3001\u7f51\u7edc\u62d3\u6251\u8bbe\u8ba1\n\n![Modbus TCP\/IP \u4f01\u4e1a\u7ea7\u90e8\u7f72\u67b6\u6784](https:\/\/www.modbus.cn\/wp-content\/uploads\/diagrams\/a05-tcp-topology.svg)\u25b2 \u56fe1\uff1a\u56db\u5c42\u7f51\u7edc\u67b6\u6784 \u2014 SCADA\u5c42\u3001\u4ee5\u592a\u7f51\u5c42\u3001TCP\u8bbe\u5907\u5c42\u3001RTU\u9057\u7559\u8bbe\u5907\u7f51\u5173\u63a5\u5165\u3002\n\n### 1.1 \u63a8\u8350\u7684\u5c42\u7ea7\u5316\u7f51\u7edc\u67b6\u6784\n\n\u4e00\u4e2a\u5178\u578b\u7684 Modbus TCP \u5de5\u4e1a\u7f51\u7edc\u5e94\u8be5\u5206\u4e3a\u4e09\u4e2a\u5c42\u7ea7\uff1a\n\n```\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502  Level 3 - \u4f01\u4e1a\u5c42                        \u2502\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u2502\n\u2502  \u2502  MES   \u2502 \u2502  ERP   \u2502 \u2502 \u8fdc\u7a0b\u76d1\u63a7\u4e2d\u5fc3  \u2502 \u2502\n\u2502  \u2514\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2518 \u2514\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2518 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2502\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524\n\u2502  Level 2 - \u63a7\u5236\u5c42              \u2502         \u2502\n\u2502  \u250c\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u2502\n\u2502  \u2502         SCADA \/ OPC UA \u670d\u52a1\u5668       \u2502 \u2502\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2502\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u253c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524\n\u2502  Level 1 - \u73b0\u573a\u5c42    \u2502                   \u2502\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u250c\u2534\u2500\u2500\u2500\u2500\u2500\u2510 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2510  \u2502\n\u2502  \u2502PLC #1\u2502 \u2502PLC #2\u2502 \u2502 \u7f51\u5173 \u2502 \u2502HMI   \u2502  \u2502\n\u2502  \u2514\u2500\u2500\u252c\u2500\u2500\u2500\u2518 \u2514\u2500\u2500\u252c\u2500\u2500\u2500\u2518 \u2514\u2500\u2500\u252c\u2500\u2500\u2500\u2518 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2518  \u2502\n\u2502     \u2502RS-485  \u2502RS-485  \u2502RS-485          \u2502\n\u2502  \u250c\u2500\u2500\u2534\u2500\u2500\u2510  \u250c\u2500\u2500\u2534\u2500\u2500\u2510  \u250c\u2500\u2500\u2534\u2500\u2500\u2510            \u2502\n\u2502  \u2502\u4ece\u7ad9 \u2502  \u2502\u4ece\u7ad9 \u2502  \u2502\u4ece\u7ad9 \u2502            \u2502\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2518  \u2514\u2500\u2500\u2500\u2500\u2500\u2518  \u2514\u2500\u2500\u2500\u2500\u2500\u2518            \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n```\n\n    - **\u73b0\u573a\u5c42\uff08Level 1\uff09\uff1a**\u5b9e\u9645\u7684 Modbus \u8bbe\u5907\uff0c\u53ef\u80fd\u662f\u539f\u751f TCP \u8bbe\u5907\u6216\u901a\u8fc7\u7f51\u5173\u63a5\u5165\u7684 RTU \u8bbe\u5907\n    - **\u63a7\u5236\u5c42\uff08Level 2\uff09\uff1a**SCADA \u7cfb\u7edf\u3001OPC UA \u670d\u52a1\u5668\uff0c\u8d1f\u8d23\u6570\u636e\u6c47\u805a\u548c\u96c6\u4e2d\u76d1\u63a7\n    - **\u4f01\u4e1a\u5c42\uff08Level 3\uff09\uff1a**MES\u3001ERP\u3001\u4e91\u5e73\u53f0\u7b49\uff0c\u4f7f\u7528\u4ece\u63a7\u5236\u5c42\u83b7\u53d6\u7684\u805a\u5408\u6570\u636e\n\n**\u5173\u952e\u539f\u5219\uff1a**\u4f01\u4e1a\u5c42\u4e0d\u5e94\u76f4\u63a5\u8bbf\u95ee\u73b0\u573a\u5c42\u8bbe\u5907\u3002\u8fd9\u6837\u8bbe\u8ba1\u7684\u539f\u56e0\u662f\uff1a\u4f01\u4e1a\u5c42\u7684\u7f51\u7edc\u73af\u5883\u548c\u5b89\u5168\u7b56\u7565\u4e0e\u5de5\u4e1a\u73b0\u573a\u5b8c\u5168\u4e0d\u540c\uff1b\u76f4\u63a5\u8bbf\u95ee\u4f1a\u7ed9\u73b0\u573a\u8bbe\u5907\u5e26\u6765\u4e0d\u53ef\u9884\u671f\u7684\u901a\u4fe1\u8d1f\u8f7d\uff1b\u5b89\u5168\u8fb9\u754c\u66f4\u96be\u7ba1\u7406\u3002\n\n### 1.2 \u5de5\u4e1a\u4ea4\u6362\u673a\u7684\u9009\u62e9\n\n\u5de5\u4e1a\u73b0\u573a\u73af\u5883\u4e0e\u529e\u516c\u5ba4\u73af\u5883\u622a\u7136\u4e0d\u540c\uff0c\u9009\u62e9\u6b63\u786e\u7684\u4ea4\u6362\u673a\u662f\u7f51\u7edc\u53ef\u9760\u6027\u7684\u7b2c\u4e00\u9053\u9632\u7ebf\uff1a\n\n    \n        \u53c2\u6570\u63a8\u8350\u8981\u6c42\n    \n    \n        \u5de5\u4f5c\u6e29\u5ea6-40\u00b0C ~ +75\u00b0C\uff08\u5de5\u4e1a\u5bbd\u6e29\uff09\n        \u9632\u62a4\u7b49\u7ea7IP40\uff08\u67dc\u5185\uff09\/ IP67\uff08\u73b0\u573a\uff09\n        \u5197\u4f59\u7535\u6e90\u53cc\u8def DC 24V \u8f93\u5165\n        \u73af\u7f51\u534f\u8bae\u652f\u6301 RSTP\/ERPS\uff08\uff1c50ms \u81ea\u6108\uff09\n        \u7ba1\u7406\u529f\u80fdVLAN\u3001QoS\u3001\u7aef\u53e3\u955c\u50cf\uff08\u7528\u4e8e\u6293\u5305\u8c03\u8bd5\uff09\n        \u63a8\u8350\u54c1\u724cMOXA\u3001Hirschmann\u3001Siemens Scalance\n    \n\n## \u4e8c\u3001IP \u5730\u5740\u89c4\u5212\n\n### 2.1 \u63a8\u8350\u5730\u5740\u65b9\u6848\n\n\u4e3a\u5de5\u4e1a\u7f51\u7edc\u89c4\u5212 IP \u5730\u5740\u65f6\uff0c\u5e94\u9075\u5faa\u300c\u4e00\u770b\u5c31\u77e5\u9053\u662f\u4ec0\u4e48\u8bbe\u5907\u300d\u7684\u539f\u5219\uff1a\n\n    \n        \u8bbe\u5907\u7c7b\u578bIP \u6bb5\u793a\u4f8b\n    \n    \n        PLC192.168.1.10 ~ .29192.168.1.11 = PLC #1\n        HMI\/\u89e6\u6478\u5c4f192.168.1.30 ~ .49192.168.1.31 = HMI #1\n        Modbus \u7f51\u5173192.168.1.50 ~ .69192.168.1.51 = \u7f51\u5173 #1\n        \u53d8\u9891\u5668\/\u4f3a\u670d192.168.1.70 ~ .89192.168.1.71 = \u53d8\u9891\u5668 #1\n        SCADA \u670d\u52a1\u5668192.168.1.100 ~ .119192.168.1.100 = SCADA \u4e3b\u7ad9\n        \u4ea4\u6362\u673a\/\u7ba1\u7406192.168.1.240 ~ .254192.168.1.254 = \u6838\u5fc3\u4ea4\u6362\u673a\n    \n\n**\u6838\u5fc3\u539f\u5219\uff1a**\n\n    - \u4f7f\u7528 \/24 \u5b50\u7f51\u63a9\u7801\uff08255.255.255.0\uff09\uff0c\u8db3\u591f\u5bb9\u7eb3 254 \u53f0\u8bbe\u5907\n    - \u4e3a\u6bcf\u79cd\u8bbe\u5907\u7c7b\u578b\u9884\u7559\u5730\u5740\u6bb5\uff0c\u5373\u4f7f\u5f53\u524d\u53ea\u7528\u4e86\u4e00\u90e8\u5206\n    - \u4e0d\u8981\u5728\u5de5\u4e1a\u7f51\u6bb5\u4f7f\u7528 DHCP\u2014\u2014\u6240\u6709\u8bbe\u5907\u4f7f\u7528\u9759\u6001 IP\n    - \u5efa\u7acb IP \u5730\u5740\u53f0\u8d26\uff0c\u5305\u542b\u8bbe\u5907\u540d\u79f0\u3001\u4f4d\u7f6e\u3001MAC \u5730\u5740\u3001\u56fa\u4ef6\u7248\u672c\n\n## \u4e09\u3001VLAN \u5212\u5206\u4e0e\u5b89\u5168\u9694\u79bb\n\n### 3.1 \u63a8\u8350 VLAN \u89c4\u5212\n\n    \n        VLAN ID\u540d\u79f0\u7528\u9014\u5b89\u5168\u7ea7\u522b\n    \n    \n        10IO_NetworkPLC\u3001\u53d8\u9891\u5668\u7b49\u5b9e\u65f6\u63a7\u5236\u8bbe\u5907\u9ad8\uff08\u7981\u6b62\u5916\u7f51\u8bbf\u95ee\uff09\n        20SCADA_NetworkSCADA\u3001HMI\u3001OPC UA \u670d\u52a1\u5668\u4e2d\n        30Gateway_NetworkModbus TCP\/RTU \u7f51\u5173\u9ad8\uff08\u7981\u6b62\u5916\u7f51\u8bbf\u95ee\uff09\n        40Engineering\u5de5\u7a0b\u5e08\u7ad9\u3001\u7f16\u7a0b\u8c03\u8bd5\u8bbe\u5907\u9ad8\n        100Enterprise\u4e0e\u5de5\u5382 IT \u7f51\u7edc\u7684\u63a5\u53e3\u4e2d\uff08\u9700\u9632\u706b\u5899\uff09\n    \n\n### 3.2 \u9632\u706b\u5899\u89c4\u5219\u914d\u7f6e\uff08iptables \u793a\u4f8b\uff09\n\n```\n# \u5141\u8bb8 SCADA \u7f51\u7edc\u8bbf\u95ee IO \u7f51\u7edc\u7684 Modbus TCP\uff08\u7aef\u53e3 502\uff09\niptables -A FORWARD -s 192.168.20.0\/24 -d 192.168.10.0\/24 \n  -p tcp --dport 502 -j ACCEPT\n\n# \u5141\u8bb8\u5de5\u7a0b\u5e08\u7ad9\u8bbf\u95ee\u6240\u6709\u5de5\u4e1a\u7f51\u7edc\niptables -A FORWARD -s 192.168.40.0\/24 -d 192.168.0.0\/16 -j ACCEPT\n\n# \u7981\u6b62\u4f01\u4e1a\u7f51\u7edc\u76f4\u63a5\u8bbf\u95ee IO \u7f51\u7edc\niptables -A FORWARD -s 192.168.100.0\/24 -d 192.168.10.0\/24 -j DROP\n\n# \u7981\u6b62\u4ece\u5916\u90e8\u4e92\u8054\u7f51\u8bbf\u95ee\u5de5\u4e1a\u7f51\u7edc\niptables -A FORWARD -i eth0 -d 192.168.0.0\/16 -j DROP\n```\n\n## \u56db\u3001\u591a\u4e3b\u7ad9\u901a\u4fe1\u67b6\u6784\n\nModbus TCP \u7684\u4e00\u4e2a\u663e\u8457\u4f18\u52bf\u662f\u652f\u6301\u591a\u4e2a\u4e3b\u7ad9\u540c\u65f6\u8bbf\u95ee\u540c\u4e00\u4e2a\u4ece\u7ad9\u8bbe\u5907\u3002\u4f46\u8fd9\u5e76\u4e0d\u610f\u5473\u7740\u53ef\u4ee5\u65e0\u9650\u5236\u5730\u8fde\u63a5\u2014\u2014\u9700\u8981\u4ed4\u7ec6\u8bbe\u8ba1\u5e76\u53d1\u7b56\u7565\u3002\n\n### 4.1 \u8fde\u63a5\u6570\u9650\u5236\n\n\u5178\u578b\u7684 Modbus TCP \u4ece\u7ad9\u8bbe\u5907\u652f\u6301\u7684\u5e76\u53d1\u8fde\u63a5\u6570\uff1a\n\n    \n        \u8bbe\u5907\u7c7b\u578b\u5178\u578b\u6700\u5927\u8fde\u63a5\u6570\n    \n    \n        \u4f4e\u7aef PLC\uff08\u5982\u897f\u95e8\u5b50 S7-1200\uff094 ~ 8\n        \u4e2d\u7aef PLC\uff08\u5982 S7-1500\uff0916 ~ 32\n        Modbus \u7f51\u51738 ~ 32\uff08\u53d6\u51b3\u4e8e\u578b\u53f7\uff09\n        PC-based Modbus Server100+\uff08\u53d7\u64cd\u4f5c\u7cfb\u7edf\u9650\u5236\uff09\n\n**\u5173\u952e\u63d0\u9192\uff1a**\u5728\u8fde\u63a5\u591a\u4e2a\u4e3b\u7ad9\u4e4b\u524d\uff0c\u52a1\u5fc5\u67e5\u9605\u8bbe\u5907\u624b\u518c\u786e\u8ba4\u6700\u5927\u8fde\u63a5\u6570\u3002\u8d85\u8fc7\u9650\u5236\u7684\u8fde\u63a5\u8bf7\u6c42\u4f1a\u5bfc\u81f4\u8bbe\u5907\u62d2\u7edd\u670d\u52a1\u3002\n\n### 4.2 Socket \u590d\u7528\u7b56\u7565\n\n\u5bf9\u4e8e\u9700\u8981\u9ad8\u9891\u8f6e\u8be2\u7684\u573a\u666f\uff0c\u5efa\u8bae\u4f7f\u7528 Socket \u8fde\u63a5\u6c60\uff08\u957f\u8fde\u63a5\uff09\u800c\u975e\u6bcf\u6b21\u8bf7\u6c42\u5efa\u7acb\u65b0\u8fde\u63a5\uff1a\n\n```\n# Python \u793a\u4f8b\uff1a\u4f7f\u7528\u8fde\u63a5\u6c60\u7684 Modbus TCP \u5ba2\u6237\u7aef\nimport socket\nclass ModbusTCPPool:\n    def __init__(self, host, port=502, pool_size=3):\n        self.host = host\n        self.port = port\n        self.pool = []\n        for _ in range(pool_size):\n            sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\n            sock.settimeout(5.0)\n            sock.connect((host, port))\n            self.pool.append(sock)\n    \n    def send_request(self, pdu):\n        \"\"\"\u4ece\u8fde\u63a5\u6c60\u53d6\u51fa socket\uff0c\u53d1\u9001\u8bf7\u6c42\"\"\"\n        sock = self.pool.pop(0)\n        try:\n            sock.sendall(pdu)\n            response = sock.recv(1024)\n            return response\n        finally:\n            self.pool.append(sock)  # \u5f52\u8fd8\u5230\u8fde\u63a5\u6c60\n```\n\n## \u4e94\u3001\u6027\u80fd\u4f18\u5316\u7b56\u7565\n\n### 5.1 TCP_NODELAY \u9009\u9879\n\nTCP \u9ed8\u8ba4\u542f\u7528\u7684 Nagle \u7b97\u6cd5\u4f1a\u5c1d\u8bd5\u5c06\u5c0f\u7684\u6570\u636e\u5305\u5408\u5e76\u540e\u53d1\u9001\uff0c\u4ee5\u51cf\u5c11\u7f51\u7edc\u8d1f\u8f7d\u3002\u4f46\u5bf9\u4e8e Modbus TCP \u8fd9\u79cd\u8bf7\u6c42-\u54cd\u5e94\u6a21\u5f0f\u7684\u5c0f\u6570\u636e\u5305\u901a\u4fe1\uff0cNagle \u7b97\u6cd5\u53cd\u800c\u589e\u52a0\u4e86\u5ef6\u8fdf\u3002\n\n```\n\/\/ C \u8bed\u8a00\uff1a\u7981\u7528 Nagle \u7b97\u6cd5\nint flag = 1;\nsetsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &flag, sizeof(flag));\n\n\/\/ Python:\nsock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)\n```\n\n**\u6d4b\u8bd5\u6570\u636e\uff1a**\u542f\u7528 TCP_NODELAY \u540e\uff0cModbus TCP \u5355\u6b21\u8bf7\u6c42\u7684\u5ef6\u8fdf\u4ece\u5e73\u5747 3.2ms \u964d\u4f4e\u5230 1.1ms\uff08100Mbps \u5c40\u57df\u7f51\u73af\u5883\uff09\u3002\n\n### 5.2 \u8d85\u65f6\u4e0e\u91cd\u8bd5\u7b56\u7565\n\n\u5408\u7406\u914d\u7f6e\u8d85\u65f6\u53c2\u6570\u662f\u4fdd\u8bc1\u901a\u4fe1\u7a33\u5b9a\u6027\u7684\u5173\u952e\uff1a\n\n    \n        \u53c2\u6570\u63a8\u8350\u503c\u8bf4\u660e\n    \n    \n        TCP \u8fde\u63a5\u8d85\u65f63 ~ 5 \u79d2\u5efa\u7acb\u8fde\u63a5\u7684\u6700\u5927\u7b49\u5f85\u65f6\u95f4\n        \u54cd\u5e94\u8d85\u65f6500 ~ 2000 ms\u7b49\u5f85\u4ece\u7ad9\u54cd\u5e94\u7684\u6700\u5927\u65f6\u95f4\n        \u91cd\u8bd5\u6b21\u65702 ~ 3 \u6b21\u8d85\u8fc7\u6b64\u6b21\u6570\u540e\u62a5\u544a\u901a\u4fe1\u6545\u969c\n        \u91cd\u8bd5\u95f4\u9694100 ~ 500 ms\u6bcf\u6b21\u91cd\u8bd5\u4e4b\u95f4\u7684\u7b49\u5f85\u65f6\u95f4\n        \u8f6e\u8be2\u95f4\u9694\u2265 \u54cd\u5e94\u8d85\u65f6 \u00d7 \u4ece\u7ad9\u6570\u91cf\u786e\u4fdd\u4e0a\u4e00\u8f6e\u901a\u4fe1\u5b8c\u5168\u7ed3\u675f\n    \n\n### 5.3 \u6279\u91cf\u8bfb\u53d6\u4f18\u5316\n\n\u4e0e\u5176\u53d1\u9001 10 \u6b21\u300c\u8bfb 1 \u4e2a\u5bc4\u5b58\u5668\u300d\u7684\u8bf7\u6c42\uff0c\u4e0d\u5982\u53d1\u9001 1 \u6b21\u300c\u8bfb 10 \u4e2a\u8fde\u7eed\u5bc4\u5b58\u5668\u300d\u7684\u8bf7\u6c42\u3002\u5728 Modbus TCP \u4e2d\uff0c\u4e00\u6b21\u8bfb\u53d6 50 \u4e2a\u5bc4\u5b58\u5668\u4e0e\u8bfb 1 \u4e2a\u5bc4\u5b58\u5668\u7684\u7f51\u7edc\u5ef6\u8fdf\u51e0\u4e4e\u76f8\u540c\uff08\u90fd\u662f TCP \u5c42\u7684\u4e00\u6b21\u5f80\u8fd4\uff09\uff0c\u4f46\u6570\u636e\u5904\u7406\u6548\u7387\u63d0\u5347\u4e86 50 \u500d\u3002\n\n## \u516d\u3001\u7f51\u5173\u914d\u7f6e\u5b9e\u6218\n\nModbus TCP\/RTU \u7f51\u5173\u662f\u8fde\u63a5\u65b0\u65e7\u8bbe\u5907\u7684\u5173\u952e\u6865\u6881\u3002\u4ee5\u4e0b\u4ee5\u5178\u578b\u7684\u300c\u6709\u4eba\u7269\u8054\u7f51 USR-TCP232\u300d\u7cfb\u5217\u7f51\u5173\u4e3a\u4f8b\uff0c\u8bf4\u660e\u914d\u7f6e\u8981\u70b9\uff1a\n\n### 6.1 \u7f51\u5173\u5de5\u4f5c\u6a21\u5f0f\u9009\u62e9\n\n    \n        \u6a21\u5f0f\u9002\u7528\u573a\u666f\u7279\u70b9\n    \n    \n        TCP ServerSCADA \u4e3b\u52a8\u8fde\u63a5\u7f51\u5173\u7f51\u5173\u76d1\u542c\u7aef\u53e3\uff0c\u7b49\u5f85\u4e3b\u7ad9\u8fde\u63a5\n        TCP Client\u7f51\u5173\u4e3b\u52a8\u4e0a\u62a5\u6570\u636e\u7f51\u5173\u4e3b\u52a8\u8fde\u63a5 SCADA \u670d\u52a1\u5668\n        UDP\u5e7f\u64ad\/\u7ec4\u64ad\u573a\u666f\u65e0\u8fde\u63a5\uff0c\u4f46\u53ef\u9760\u6027\u4f4e\n        Modbus TCP \u8f6c RTU\u6807\u51c6\u534f\u8bae\u8f6c\u6362\u81ea\u52a8\u5904\u7406 MBAP \u2194 RTU \u8f6c\u6362\n    \n\n**\u63a8\u8350\u4f7f\u7528\u300cModbus TCP \u8f6c RTU\u300d\u6a21\u5f0f**\u2014\u2014\u7f51\u5173\u81ea\u52a8\u5904\u7406\u534f\u8bae\u8f6c\u6362\uff0c\u5305\u62ec\u6dfb\u52a0\/\u79fb\u9664 MBAP \u62a5\u5934\u3001CRC \u6821\u9a8c\u548c\u751f\u6210\u3002\n\n### 6.2 \u4e32\u53e3\u53c2\u6570\u914d\u7f6e\n\n```\n\u5178\u578b\u914d\u7f6e:\n- \u6ce2\u7279\u7387: 9600\uff08\u4f18\u5148\uff09\/ 19200\uff08\u4e2d\u7b49\u901f\u7387\uff09\/ 115200\uff08\u9ad8\u901f\uff0c\u9700\u8bbe\u5907\u652f\u6301\uff09\n- \u6570\u636e\u4f4d: 8\n- \u6821\u9a8c\u4f4d: None\uff08\u6700\u5e38\u89c1\uff09\/ Even \/ Odd\n- \u505c\u6b62\u4f4d: 1\uff08\u6807\u51c6\uff09\/ 2\uff08\u4e0e\u90e8\u5206\u8001\u8bbe\u5907\u517c\u5bb9\uff09\n- \u6d41\u63a7\u5236: None\uff08RS-485 \u4e0d\u4f7f\u7528\u786c\u4ef6\u6d41\u63a7\uff09\n\n\u91cd\u8981\uff1a\u7f51\u5173\u7684\u4e32\u53e3\u53c2\u6570\u5fc5\u987b\u4e0e\u4e0b\u6e38\u6240\u6709 RTU \u8bbe\u5907\u5b8c\u5168\u4e00\u81f4\n```\n\n## \u4e03\u3001\u76d1\u63a7\u4e0e\u8bca\u65ad\n\n### 7.1 \u4f7f\u7528 Wireshark \u5206\u6790 Modbus TCP\n\nWireshark \u5185\u7f6e\u4e86 Modbus TCP \u534f\u8bae\u7684\u89e3\u6790\u5668\u3002\u901a\u8fc7\u5728\u4ea4\u6362\u673a\u4e0a\u914d\u7f6e\u7aef\u53e3\u955c\u50cf\uff0c\u53ef\u4ee5\u5c06\u6240\u6709 Modbus TCP \u6d41\u91cf\u6293\u53d6\u4e0b\u6765\u8fdb\u884c\u5206\u6790\uff1a\n\n```\nWireshark \u8fc7\u6ee4\u5668\u793a\u4f8b:\nmodbus                   # \u53ea\u663e\u793a Modbus \u62a5\u6587\nmodbus && tcp.port==502  # \u53ea\u770b 502 \u7aef\u53e3\u7684 Modbus \u6d41\u91cf\nmodbus.func_code == 3     # \u53ea\u770b\u529f\u80fd\u7801 0x03\uff08\u8bfb\u4fdd\u6301\u5bc4\u5b58\u5668\uff09\nmodbus.exception_code     # \u53ea\u770b\u5305\u542b\u5f02\u5e38\u7801\u7684\u54cd\u5e94\ntcp.analysis.retransmission && modbus  # \u770b Modbus \u91cd\u4f20\n```\n\n### 7.2 \u5173\u952e\u76d1\u63a7\u6307\u6807\n\n    - **\u901a\u4fe1\u6210\u529f\u7387\uff1a**\u6b63\u5e38\u54cd\u5e94\u6570 \/ \u603b\u8bf7\u6c42\u6570\uff0c\u5e94 \u2265 99.5%\n    - **\u5e73\u5747\u54cd\u5e94\u5ef6\u8fdf\uff1a**\u5e94 \uff1c 50ms\uff08\u5c40\u57df\u7f51\u73af\u5883\uff09\n    - **TCP \u91cd\u4f20\u7387\uff1a**\u5e94 \uff1c 0.1%\uff0c\u9ad8\u91cd\u4f20\u7387\u610f\u5473\u7740\u7f51\u7edc\u8d28\u91cf\u95ee\u9898\n    - **\u5f02\u5e38\u7801\u6bd4\u4f8b\uff1a**\u6301\u7eed\u7684\u5f02\u5e38\u7801 0x06 \u610f\u5473\u7740\u4ece\u7ad9\u8fc7\u8f7d\n\n## \u516b\u3001\u5de5\u4e1a\u4e91\u5e73\u53f0\u63a5\u5165\n\n\u5c06 Modbus TCP \u6570\u636e\u63a5\u5165\u4e91\u5e73\u53f0\uff08\u5982\u963f\u91cc\u4e91 IoT\u3001\u534e\u4e3a\u4e91 IoT\uff09\u662f\u5f53\u524d\u5de5\u4e1a\u7269\u8054\u7f51\u7684\u5178\u578b\u9700\u6c42\u3002\u63a8\u8350\u7684\u67b6\u6784\u5982\u4e0b\uff1a\n\n```\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510   Modbus TCP   \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510   MQTT\/HTTP   \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502 Modbus   \u2502\u25c4\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25ba\u2502 \u8fb9\u7f18\u7f51\u5173    \u2502\u25c4\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25ba\u2502  \u4e91\u5e73\u53f0   \u2502\n\u2502 \u4ece\u7ad9\u8bbe\u5907  \u2502   \u5c40\u57df\u7f51        \u2502 (Edge GW)  \u2502   \u4e92\u8054\u7f51       \u2502  (IoT)   \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518                 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518               \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n                                \u2502\n                         \u672c\u5730\u6570\u636e\u7f13\u5b58 + \u65ad\u7f51\u7eed\u4f20\n                         \u534f\u8bae\u8f6c\u6362 + \u6570\u636e\u6e05\u6d17\n                         \u8fb9\u7f18\u8ba1\u7b97 + \u672c\u5730\u544a\u8b66\n```\n\n**\u8fb9\u7f18\u7f51\u5173\u7684\u6838\u5fc3\u529f\u80fd\uff1a**\n\n    - Modbus TCP \u2192 MQTT \u534f\u8bae\u8f6c\u6362\n    - \u6570\u636e\u672c\u5730\u7f13\u5b58\uff08\u65ad\u7f51\u65f6\u5b58\u50a8\uff0c\u6062\u590d\u540e\u7eed\u4f20\uff09\n    - \u8fb9\u7f18\u8ba1\u7b97\uff08\u5982\u672c\u5730\u544a\u8b66\u3001\u6570\u636e\u8fc7\u6ee4\uff09\n    - \u5b89\u5168\u9694\u79bb\uff08\u4e91\u5e73\u53f0\u65e0\u6cd5\u76f4\u63a5\u8bbf\u95ee\u5de5\u4e1a\u5185\u7f51\uff09\n\n## \u4e5d\u3001\u5e38\u89c1\u95ee\u9898 FAQ\n\n### Q1: Modbus TCP \u901a\u4fe1\u65f6\u65ad\u65f6\u7eed\uff0cPing \u6b63\u5e38\u4f46 Modbus \u4e0d\u901a\uff1f\n\nPing \u4f7f\u7528\u7684\u662f ICMP \u534f\u8bae\uff0c\u4e0e TCP \u4e0d\u540c\u3002\u5e38\u89c1\u539f\u56e0\u662f\u9632\u706b\u5899\u963b\u585e\u4e86 502 \u7aef\u53e3\u3002\u8bf7\u68c0\u67e5\u4ece\u7ad9\u8bbe\u5907\u4ee5\u53ca\u4e2d\u95f4\u6240\u6709\u9632\u706b\u5899\u7684 TCP 502 \u7aef\u53e3\u89c4\u5219\u3002\u53e6\u4e00\u4e2a\u53ef\u80fd\u539f\u56e0\u662f\u8bbe\u5907\u8fbe\u5230\u4e86\u6700\u5927\u8fde\u63a5\u6570\u9650\u5236\u3002\n\n### Q2: \u4e3a\u4ec0\u4e48\u8de8 VLAN \u540e Modbus TCP \u65e0\u6cd5\u901a\u4fe1\uff1f\n\nVLAN \u4e4b\u95f4\u9700\u8981\u8def\u7531\u5668\u8fdb\u884c\u4e09\u5c42\u8f6c\u53d1\u3002\u8bf7\u68c0\u67e5\uff1a\u8def\u7531\u5668\u662f\u5426\u5141\u8bb8 VLAN \u95f4\u7684 IP \u8def\u7531\u3001\u9632\u706b\u5899\u662f\u5426\u653e\u884c\u4e86 TCP 502 \u7aef\u53e3\u3001\u5982\u679c\u4f7f\u7528\u4e86 NAT\uff0cMBAP \u62a5\u5934\u4e2d\u7684\u957f\u5ea6\u5b57\u6bb5\u662f\u5426\u6b63\u786e\u3002\n\n### Q3: \u591a\u4e2a\u4e3b\u7ad9\u540c\u65f6\u5199\u540c\u4e00\u4e2a\u5bc4\u5b58\u5668\u4f1a\u600e\u6837\uff1f\n\nModbus \u534f\u8bae\u672c\u8eab\u4e0d\u63d0\u4f9b\u5e76\u53d1\u5199\u5165\u4fdd\u62a4\u3002\u6700\u540e\u4e00\u4e2a\u5199\u5165\u7684\u4e3b\u7ad9\u5c06\u8986\u76d6\u4e4b\u524d\u7684\u503c\u3002\u5982\u679c\u5b58\u5728\u591a\u4e3b\u7ad9\u5199\u5165\u540c\u4e00\u5bc4\u5b58\u5668\u7684\u9700\u6c42\uff0c\u5fc5\u987b\u5728\u5e94\u7528\u5c42\u5b9e\u73b0\u4e92\u65a5\u9501\u673a\u5236\u3002\n\n## \u5341\u3001\u603b\u7ed3\n\nModbus TCP \u90e8\u7f72\u7684\u672c\u8d28\u662f\u300c\u5728\u5de5\u4e1a\u73af\u5883\u4e0b\u53ef\u9760\u5730\u8fd0\u884c TCP\/IP \u7f51\u7edc\u300d\u3002\u5b83\u65e2\u9700\u8981\u7f51\u7edc\u5de5\u7a0b\u7684\u77e5\u8bc6\uff08IP \u89c4\u5212\u3001VLAN\u3001\u9632\u706b\u5899\uff09\uff0c\u53c8\u9700\u8981\u81ea\u52a8\u5316\u5de5\u7a0b\u7684\u7ecf\u9a8c\uff08\u8f6e\u8be2\u7b56\u7565\u3001\u8d85\u65f6\u914d\u7f6e\u3001\u534f\u8bae\u8f6c\u6362\uff09\u3002\u5c06\u4e24\u4e2a\u9886\u57df\u7684\u77e5\u8bc6\u878d\u4f1a\u8d2f\u901a\uff0c\u624d\u80fd\u6784\u5efa\u51fa\u7a33\u5b9a\u3001\u5b89\u5168\u3001\u53ef\u6269\u5c55\u7684 Modbus TCP \u901a\u4fe1\u7cfb\u7edf\u3002\n\n**\u6838\u5fc3 Checklist\uff1a**\n\n    - \u4e09\u5c42\u7f51\u7edc\u67b6\u6784\u8bbe\u8ba1\uff08\u73b0\u573a\u5c42 \u2192 \u63a7\u5236\u5c42 \u2192 \u4f01\u4e1a\u5c42\uff09\n    - \u9759\u6001 IP \u5730\u5740 + \u89c4\u8303\u547d\u540d + \u53f0\u8d26\u7ba1\u7406\n    - VLAN \u9694\u79bb + \u9632\u706b\u5899\u6700\u5c0f\u6743\u9650\u89c4\u5219\n    - TCP_NODELAY + Socket \u957f\u8fde\u63a5 + \u6279\u91cf\u8bfb\u53d6\n    - \u5408\u7406\u7684\u8d85\u65f6 + \u91cd\u8bd5\u53c2\u6570\uff08500ms \u8d85\u65f6, 3 \u6b21\u91cd\u8bd5\uff09\n    - Wireshark \u6293\u5305 + \u5173\u952e\u6307\u6807\u76d1\u63a7\n\n**\u76f8\u5173\u9605\u8bfb\uff1a**Modbus RTU \u4e0e TCP \u6df1\u5ea6\u5bf9\u6bd4 | Modbus \u5b89\u5168\u534f\u8bae\u6df1\u5ea6\u89e3\u6790 | Modbus \u5728\u5de5\u4e1a\u7269\u8054\u7f51\u4e2d\u7684\u8fdb\u9636\u5e94\u7528\n\n---\n*modbus.cn*\n"