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Description: vc程序与modbus进行通讯源码， 可以与plc控制的下位机通讯，可以了解到通讯编码规则-vc program source code to communicate with modbus, plc control with the next bit machine communications, coding rules can understand communication
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Size: 31744 |
Author: 尹洪革 |
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Description: Modbus 通信規約基本上是遵循Master and Slave 的通信步驟，有一方扮演Master 角色採取主動詢問方式，送出Query Message 給Slave 方，然後由Slave 方依據接到的Query Message 內容準備Response Message 回傳給Master。即使目前硬體通信已經可以達到雙方互相主動通信的能力，但是於Modbus 通信規約的規定，必須一方為Master，另一方為Slave 不能互換角色。一般使用上，監控系統(HMI)都為Master，PLC、電表、儀表等都為Slave，HMI 系統一直Polling Slave 的各種elay and register 最新數值，然後做顯示及各種邏輯計算及控制調整等處理。-Modbus communication protocol is basically follow the Master and Slave communication procedure, one party to take proactive role to play Master asks way, sending Query Message to the Slave side, and then received by the Slave side based content preparation Query Message Response Message back to the Master. Even if the current hardware communication initiative can already achieve mutual communication abilities, but the provisions of the Modbus communication protocol must be one of the Master, the other as Slave can not swap roles. General use, the monitoring system (HMI) are Master, PLC, meter, meters so as Slave, HMI systems have been Polling Slave various elay and register the latest values, and then do the show, and various logic calculation and control adjustments, etc. Managers.
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Size: 114688 |
Author: Kai |
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Description: 基于modbus协议的PC与PLC通讯程序-Modbus connection between PC and PLC communication program
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Size: 15360 |
Author: LJF |
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Description: modbus plc communication
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Size: 19456 |
Author: rthqua |
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Description: modbus plc communication
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Size: 19456 |
Author: equences |
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Description: 这是plc与单片机用modbus进行通讯的源码，可控制继电器。-This is PLC and single-chip microcomputer with modbus communication source code, can control relay.
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Size: 60416 |
Author: 王小龙 |
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Description: 为什么要移植Freemodbus，这个问题需要从两个方面来回答。第一，modbus是一个非常好的应用层协议，它很简洁也相对完善。对于还没有接触过modbus的朋友来说，我非常不建议直接移植freemodbus，应该耐心的从modbus文档入手，并充分把握身边的所有资源，例如PLC的中modbus部分。第二，其实嵌入式系统的通信协议可以自己制定，但是通过实践发现自己定制的协议漏洞百出，尤其是扩展极为困难。我始终认为借鉴他人的经验是很好的途径。借鉴他人成熟的代码，可以减少调试的时间，实现的功能也多了不少。
个人观点，仅供参考。
freemodbus小提示
freemodbus只能使用从机功能。freemodbus更适合嵌入式系统，虽然例子中也有WIN32的例子，如果想要做PC机程序并实现主机功能，推荐使用另一个modbus库——NMODBUS，使用C#开发。同样WINFORM也可以通过自己编写串口代码实现modbus功能，但是这会花费很长的时间，可能是一周也可能是一个月，如果使用现成的代码库，那么开发时间可能只有10分钟。-Why transplant Freemodbus, this issue needs to be answered in two ways . First , modbus is a very good application layer protocol , it is very simple and relatively perfect. For no contact with modbus friends, I do not recommend direct transplant freemodbus, the patient should start from modbus documents and take full advantage of all the resources around you , for example, part of the modbus PLC. Second, the fact communication protocol embedded systems can develop their own , but through practice found loopholes own custom protocols , especially the expansion is extremely difficult. I have always believed that draw on the experience of others is a good way . Learn from others mature code can reduce debugging time , functions are also a lot more .
Personal point of view , for reference only .
freemodbus Tips
freemodbus only from the machine function . freemodbus more suitable for embedded systems, although there are examples of WIN32 example , if you want
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Size: 583680 |
Author: zhangpan |
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Description: 建立上位机与PLC之间的modbus（RTU）通讯。利用c#实现-Modbus established between PC and PLC (RTU) communication. Use c# achieve
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Size: 4096 |
Author: bailimin |
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Description: vb modbus crc16 通信源程序,可以单片机.PLC通信.-vb modbus crc16 communication source, can microcontroller. PLC communications.
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Size: 12288 |
Author: zoomhan |
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Description: delta plc controll using modbus communication
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Size: 75776 |
Author: rakesh |
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Description: 本程序基于MODBUS RTU协议，通过发送协议指令码实现与各种PLC通讯功能。经测试程序功能正常。-The program is based on MODBUS RTU protocol by sending the script to achieve agreement with a variety of PLC communication. After testing program functions properly.
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Size: 1907712 |
Author: 尚名近 |
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Description: 台达PLC MODBUS 通讯LRC 校验实例-Delta PLC MODBUS communication LRC check instances
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Size: 96256 |
Author: kangming |
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Description: 单片机（stc89c52）通过RS485与PLC通信，采用modbus协议，利用单片机闲置的一个管脚置高或低，来判断出现单片机程序执行的情况。硬件连接比较简单，单片机通过485的A/B端连接到RS485/RS422，RS422连接但PLC。这个就是.c程序不是工程文件，下载后自己建立个keilC工程就可以了。-SCM (stc89c52) via RS485 communication with the PLC, using modbus protocol, using SCM idle a pin high or low, to determine the circumstances microcontroller program execution occurs. Relatively simple hardware connection, the microcontroller 485 A/B terminal is connected to the RS485/RS422 through, RS422 connection but PLC. This is not a project file .c program he established a keilC project after downloading it.
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Size: 3072 |
Author: 蓝色风 |
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Description: PLC中MODBUS RTU的编程参考,可以连接西门子PLC，国产的合泰PLC等- modbus rtu program for PLC
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Size: 247808 |
Author: wang |
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Description: 以西门子S7_200为例，详细的讲解了modbus协议在PLC中的应用-Siemens S7_200 example, a detailed explanation of the modbus protocol in the PLC
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Size: 2573312 |
Author: 魏文杰 |
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Description: 西门子PLC 网络通讯TCP 调试软件 包含西门子自带协议和MODBUS-TCP两种协议调试，是工具非源码。-TCP and MODBUS-TCP
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Size: 253952 |
Author: 曹中华 |
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Description: Delta PLC Modbus Controller
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Size: 292864 |
Author: Kousha |
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Description: vb主站程序，是用vb实现modbus通讯协议控制，可控制plc-modbus tcp
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Size: 5120 |
Author: 522015 |
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Description: modbus协议写成的检验rtu是否正确的程序，很实用-modbus rtu plc
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Size: 817152 |
Author: 522015 |
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Description: modbus主站程序，可以实现和plc的通信，很有用哦-modbus slave
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Size: 29696 |
Author: 522015 |
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