200Smart与仪表的modbus通讯
仪表的功能码：0x03:读保持寄存器
0x04:读输入寄存器
仪表的输入寄存器地址 0x0001 温度值 2字节
0x0002 湿度值 2字节
Modscan32软件充当主站，用485线将仪表和电脑连接。
在MODSCSAN32软件中，配置—》显示选项—》显示数据流
注意：Modscan32软件与仪表通讯时，PLC就无法与仪表通信了，因为Modbus是
单主站通讯。Modscan32充当主站，PLC就无法当主站了。
由PLC作为主站跟仪表进行通讯：
当有多个Modbus仪表时，要修改仪表的设备号
当连接有多个Modbus仪表时，需要通过Modscan32软件修改每个仪表的设备号
然后再连入PLC进行通讯。
此时已把默认的站地址1改成了站地址2了。
MODBUS（客户端和服务端）指令的管脚定义
Modbus地址与S7-200Smart CPU地址映射关系
Truly appreciated this entry. It offered a lot of useful insights. Excellent effort on writing this.
Appreciated the details in this post. It’s highly detailed and filled with beneficial details. Excellent job!
Excellent post. I found the details extremely useful. Loved the manner you detailed all the points.
This post is fantastic. I picked up plenty from reading it. The information is highly educational and structured.
Wonderful entry. It’s very clear and filled with valuable information. Many thanks for sharing this information.
Genuinely enjoyed this entry. It provided tons of useful information. Great effort on writing this.
This article offered excellent details. I truly liked perusing it. Your content is highly arranged and straightforward to comprehend.
This article is wonderful. I gained a lot from perusing it. The details is very enlightening and structured.
Fantastic article. I discovered the details highly useful. Loved the manner you explained everything.
Excellent entry. I found the content extremely useful. Loved the method you clarified everything.