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
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