下面用一个实例来介绍Smart Line触摸屏与一台V20变频器通过MODBUS通讯的实现方法。该例子中用到的主要硬件设备如表1所示，触摸屏组态软件为WinCC Flexible 2008 SP4 China。

 硬件安装步骤如下：

1）将变频器、电机、触摸屏固定在安装工位上。

2）连接变频器到电机的动力电缆和接地电缆。

3）连接供电电源到变频器的动力电缆和接地电缆。

4）连接变频器和触摸屏的RS485通讯电缆。触摸屏RS485的9针接口与 V20端子对应关系：3对应P+，8对应N-。

5）连接24V直流电源的交流进线电缆和到触摸屏的直流供电电缆。

3. V20变频器参数设置

        V20变频器要采用MODBUS通讯，可以做如下设置：

1）变频器恢复出厂参数：

P0010=30

P0970=21

2）变频器快速调试，选择Cn011-MODBUS通讯连接宏：

a)设置电网频率和功率单位

b)输入电机铭牌参数

c)选择连接宏Cn011-MODBUS通讯

d)选择应用宏AP000

表2 Cn011对应参数设置

参数  描述  工厂缺省值  Cn011默认值  备注

P0700[0]  选择命令源  1  5  RS485为命令源

P1000[0]  选择速度给定  1  5  RS485为速度设定值

P2023[0]  RS485协议选择  1  2  MODBUS RTU协议

P2010[0]  USS/MODBUS波特率  8  6  波特率为9600bps

P2021[0]  MODBUS地址  1  1  变频器MODBUS地址为1

P2022[0]  MODBUS应答超时时间  1000  1000  向主站发回应答的时间

P2014[0]  USS/MODBUS报文间断时间  2000  100  监控报文间断时间

3）修改MODBUS通讯参数，其它参数为Cn011连接宏默认参数：

P2014[0]=0 不监控报文间隔时间，否则可能会报F72故障

P2021[0]=3 MODBUS设备地址为3（与触摸屏组态软件中设置的从站地址一致）

中海德(福建)工业设备有限公司

公司名称：中海德（福建）工业设备有限公司

ZHONG HAI DE(FUJIAN)INDUSTRIALE QUIPMENT CO.，LTD.

姓名：陈小真

联系方式：0591-83566917

商务手机：18005006971

地址：福建省福州市区乌龙江大道正荣财富中心B座八层

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