下面用一個實例來介紹Smart Line觸摸屏與一臺V20變頻器通過MODBUS通訊的實現方法。該例子中用到的主要硬件設備如表1所示，觸摸屏組態軟件為WinCC Flexible 2008 SP4 China。

 硬件安裝步驟如下：

1）將變頻器、電機、觸摸屏固定在安裝工位上。

2）連接變頻器到電機的動力電纜和接地電纜。

3）連接供電電源到變頻器的動力電纜和接地電纜。

4）連接變頻器和觸摸屏的RS485通訊電纜。觸摸屏RS485的9針接口與 V20端子對應關系：3對應P+，8對應N-。

5）連接24V直流電源的交流進線電纜和到觸摸屏的直流供電電纜。

3. V20變頻器參數設置

        V20變頻器要采用MODBUS通訊，可以做如下設置：

1）變頻器恢復出廠參數：

P0010=30

P0970=21

2）變頻器快速調試，選擇Cn011-MODBUS通訊連接宏：

a)設置電網頻率和功率單位

b)輸入電機銘牌參數

c)選擇連接宏Cn011-MODBUS通訊

d)選擇應用宏AP000

表2 Cn011對應參數設置

參數  描述  工廠缺省值  Cn011默認值  備注

P0700[0]  選擇命令源  1  5  RS485為命令源

P1000[0]  選擇速度給定  1  5  RS485為速度設定值

P2023[0]  RS485協議選擇  1  2  MODBUS RTU協議

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

P2021[0]  MODBUS地址  1  1  變頻器MODBUS地址為1

P2022[0]  MODBUS應答超時時間  1000  1000  向主站發回應答的時間

P2014[0]  USS/MODBUS報文間斷時間  2000  100  監控報文間斷時間

3）修改MODBUS通訊參數，其它參數為Cn011連接宏默認參數：

P2014[0]=0 不監控報文間隔時間，否則可能會報F72故障

P2021[0]=3 MODBUS設備地址為3（與觸摸屏組態軟件中設置的從站地址一致）

中海德(福建)工業設備有限公司

公司名稱：中海德（福建）工業設備有限公司

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

姓名：陳小真

聯系方式：0591-83566917

商務手機：18005006971

地址：福建省福州市區烏龍江大道正榮財富中心B座八層

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