本案例為西門子S7-1200PLC通過捷米特Modbus轉(zhuǎn)EtherNet/IP網(wǎng)關(guān)捷米特JM-EIP-RTU連接AB PLC的配置案例。
網(wǎng)關(guān)分別從ETHERNET/IP一側(cè)和MODBUS一側(cè)讀寫數(shù)據(jù),存入各自的緩沖區(qū),網(wǎng)關(guān)內(nèi)部將緩沖區(qū)的數(shù)據(jù)進行交換,從而實現(xiàn)兩邊數(shù)據(jù)的傳輸。
網(wǎng)關(guān)做為MODBUS主站
打開GW Config軟件,選擇“Modbus配置”,點擊確定后進入設(shè)置界面。
2, 雙擊軟件右側(cè)設(shè)備列表中的“Modbus Master”,可以添加一個虛擬主站到項目中,捷米特JM-EIP-RTU
3, 雙擊軟件右側(cè)設(shè)備列表中的“Modbus Slave”,可以添加一個從站到此主站的Modbus總線中,添加后可以在軟件的主窗口中看到Modbus總線中的所有站點,如下圖:
4, 雙擊主窗口中的“Modbus Master”圖標,彈出Modbus主站參數(shù)設(shè)置窗口,在這個窗口里,用戶可以設(shè)置Modbus總線的運行參數(shù)和網(wǎng)關(guān)做為捷米特Modbus主站工作時的特性,如下圖:
5, 雙擊主窗口的某一個“Modbus Slave”,設(shè)置該從站的報文。
6, 如下圖所示,用戶給1號從站添加了1條寫線圈、1條讀線圈、一條寫寄存器、一條讀寄存器。每一條報文,用戶可以在表格內(nèi)修改起始地址和數(shù)據(jù)長度。
7, 配置完成后,用戶再次雙擊“Modbus Master”,點擊“地址表”按鈕,彈出 Modbus從站數(shù)據(jù)列表捷米特JM-EIP-RTU,
8, 用戶配置完成Modbus報文后,將配置下載到網(wǎng)關(guān)中。
9. 打開RSLogix5000,進行硬件組態(tài),首先添加捷米特Modbus轉(zhuǎn)EtherNet/IP網(wǎng)關(guān)JM-EIP-RTU的EDS文件;
10, 安裝完成后添加模塊,選擇New Module;
11.選擇要添加的設(shè)備,點擊“Create”:
12.在“Name”中填入網(wǎng)關(guān)的名稱,在“IP Address”中填入網(wǎng)關(guān)JM-EIP-RTU的IP地址,點擊“Change”設(shè)置網(wǎng)關(guān)的輸入輸出數(shù)據(jù)長度。
13.下圖舉例設(shè)置了20字節(jié)的輸入數(shù)據(jù)和20字節(jié)的輸出數(shù)據(jù):
14.下載配置到PLC;
15,使用Modbus Slave軟件做為從站,與網(wǎng)關(guān)的RTU端子連接進行測試。點擊軟件的菜單欄“Connection——Connect…”,設(shè)置正確的端口號,然后點擊OK,開始運行。如下圖:
16,點擊軟件的菜單欄“Setup——Slave Definition”,設(shè)置從站允許訪問的數(shù)據(jù)區(qū),如下圖:
17,在ETHERNET/IP主站軟件上,將輸出數(shù)據(jù)的第1個word賦值為1(控制字=1),啟動MODBUS-RTU通訊。
18,可以在ETHERNET/IP主站軟件中監(jiān)控到第一個上傳數(shù)據(jù),數(shù)據(jù)修改成功。
19,在ETHERNET/IP主站軟件上手動修改一個output數(shù)據(jù)值,在Modbus Poll軟件的3xxx區(qū)中可以監(jiān)視到,數(shù)據(jù)已經(jīng)讀取成功。
審核編輯 黃宇
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