外文文獻(xiàn)及翻譯--理解s7--200網(wǎng)絡(luò)通訊的基本概念-其他專業(yè)-資料下載頁
2025-01-19 08:58本頁面
【導(dǎo)讀】S7--200可以滿足您的通訊和網(wǎng)絡(luò)需求，它不僅支持簡單的網(wǎng)絡(luò)，而且支持比較復(fù)雜的網(wǎng)絡(luò)。S7--200可以通過兩種不同類型的PPI多主站電纜進(jìn)行通訊。只需執(zhí)行以下步驟即可：。請(qǐng)注意，一次只能使用一個(gè)USB接口。本手冊(cè)的實(shí)例使用的是RS--232/PPI多主站電纜。原先的PC/PPI電纜已RS--232/PPI多主站電纜。關(guān)于這些電纜的訂貨號(hào)，可參見附錄C。典型的主站器件包括：STEP7--Micro/WIN、TD200等HMI產(chǎn)品和S7--300或S7--400PLC。配置為從站的器件只能對(duì)其它主站的要求作出響應(yīng)，自己不能發(fā)出要求。數(shù)據(jù)通過網(wǎng)絡(luò)傳輸?shù)乃俣仁遣ㄌ芈?。其單位通常為Kbaud或者M(jìn)baud。因此，網(wǎng)絡(luò)的最高波特率取決于連接在該網(wǎng)絡(luò)上的波特率最低的。其波特率必須與網(wǎng)絡(luò)上其它設(shè)備的波特率一。通常，您不需要改變STEP7--Micro/WIN的缺省站地址0。在下載系統(tǒng)塊期間，STEP7--Micro/WIN將會(huì)驗(yàn)證所選的波特率。若在使用CP卡進(jìn)行通訊的情況下，該。功能將無法實(shí)現(xiàn)。下面是S7--200CPU所支持的協(xié)議的總覽。
【正文】 f masters that can municate with any one slave。 however, you cannot install more than 32 masters on the work. Figure 77 PPI Network S7200 CPUs can act as master devices while they are in RUN mode, if you enable PPI master mode in the user program. (See the description of SMB30 in Appendix D.) After enabling PPI master mode, you can use the Network Read or the Network Write instructions to read from or write to other S7200s. While the S7200 is acting as a PPI master, it still responds as a slave to requests from other masters. PPI Advanced allows work devices to establish a logical connection between the devices. With PPI Advanced, there are a limited number of connections supplied by each device. See Table 73 for the number of connections supported by the S7200. All S7200 CPUs support both PPI and PPI Advanced protocols, while PPI Advanced is the only PPI protocol supported by the EM 277 module. Table 73 Number of Connections for the S7200 CPU and EM 277 Modules Module Baud Rate Connections S7200 CPU Port 0 Port 1 kbaud, kbaud, or kbaud 4 15 kbaud, kbaud, or kbaud 4 EM 277 Module kbaud to 12 Mbaud 6 per module MPI Protocol MPI allows both mastermaster and masterslave munications. See Figure 78. To municate with an S7200 CPU, STEP 7Micro/WIN establishes a masterslave connection. MPI protocol does not municate with an S7200 CPU operating as a master. Network devices municate by means of separate connections (managed by the MPI protocol) between any two devices. Communication between devices is limited to the number of connections supported by the S7200 CPU or EM 277 modules. See Table 73 for the number of connections supported by the S7200. For MPI protocol, the S7300 and S7400 PLCs use the XGET and XPUT instructions to read and write data to the S7200 CPU. For information about these instructions, refer to your S7300 or S7400 programming manual. Figure 78 MPI Network PROFIBUS Protocol The PROFIBUS protocol is designed for highspeed munications with distributed I/O devices (remote I/O). There are many PROFIBUS devices available from a variety of manufacturers. These devices range from simple input or output modules to motor controllers and PLCs. PROFIBUS works typically have one master and several slave I/O devices. See Figure 79. The master device is configured to know what types of I/O slaves are connected and at what addresses. The master initializes the work and verifies that the slave devices on the work match the configuration. The master continuously writes output data to the slaves and reads input data from them. 16 Figure 79 PROFIBUS Network When a DP master configures a slave device successfully, it then owns that slave device. If there is a second master device on the work, it has very limited access to the slaves owned by the first master. TCP/IP Protocol The S7200 can support TCP/IP Ether munication through the use of an Ether (CP 2431) orInter (CP 2431 IT) expansion module. Table 74 shows the baud rate and number of connections supported by these modules. Table 74 Number of Connections for the Ether (CP 2431) and the Inter (CP 2431 IT) Modules Module Baud Rate Connections Ether (CP 2431) Module 10 to 100 Mbaud 8 general purpose connections Inter (CP 2431 IT) Module 1 STEP 7Micro/WIN connection Refer to the CP 2431 Communications Processor for Industrial Ether Manual or the CP 2431 IT Communications Processor for Industrial Ether and Information Technology Manual for additional information
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