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(jìn)行交換,從而實(shí)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(diǎn)擊確定后進(jìn)入設(shè)置界面。
雙擊軟件右側(cè)設(shè)備列表中的“Modbus Master”,可以添加一個(gè)虛擬主站到項(xiàng)目中,捷米特JM-EIP-RTU
雙擊軟件右側(cè)設(shè)備列表中的“Modbus Slave”,可以添加一個(gè)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(diǎn),如下圖:
雙擊主窗口中的“Modbus Master”圖標(biāo),彈出Modbus主站參數(shù)設(shè)置窗口,在這個(gè)窗口里,用戶可以設(shè)置Modbus總線的運(yùn)行參數(shù)和網(wǎng)關(guān)做為捷米特Modbus主站工作時(shí)的特性,如下圖:
雙擊主窗口的某一個(gè)“Modbus Slave”,設(shè)置該從站的報(bào)文。
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(bào)文,用戶可以在表格內(nèi)修改起始地址和數(shù)據(jù)長度。
配置完成后,用戶再次雙擊“Modbus Master”,點(diǎn)擊“地址表”按鈕,彈出 Modbus從站數(shù)據(jù)列表捷米特JM-EIP-RTU,
用戶配置完成Modbus報(bào)文后,將配置下載到網(wǎng)關(guān)中。
9. 打開RSLogix5000,進(jìn)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;
安裝完成后添加模塊,選擇New Module;
11.選擇要添加的設(shè)備,點(diǎn)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(diǎn)擊“Change”設(shè)置網(wǎng)關(guān)的輸入輸出數(shù)據(jù)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(jìn)行測試。點(diǎn)擊軟件的菜單欄“Connection——Connect…”,設(shè)置正確的端口號,然后點(diǎn)擊OK,開始運(yùn)行。如下圖:
16,點(diǎn)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(gè)word賦值為1(控制字=1),啟動(dòng)MODBUS-RTU通訊。
18,可以在ETHERNET/IP主站軟件中監(jiān)控到第一個(gè)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(dòng)修改一個(gè)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。
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