MVME376工控備件模塊
如果遠程子網(wǎng)的大小超過(guò)“遠程子網(wǎng)大小”組中定義的限制，則在連接時(shí)跳過(guò)該子網(wǎng)。該組包含：?最大值定義遠程子網(wǎng)的最大大小。?如果絕對最大值小于最大值，則使用絕對最大值。OPC服務(wù)器DriveWindow 2 7-41搜索設備組該組定義是否使用廣播方法在連接時(shí)搜索DDCS/UDP設備。通常情況下，您不會(huì )同時(shí)使用這兩種方法。該組包含：?近表示使用本地以太網(wǎng)段UDP廣播（IP=255.255.255.255，RFC 919）。?Intranet表示使用PC子網(wǎng)UDP廣播（IP=IP或非子網(wǎng)掩碼，RFC 922）。請注意，如果PC屬于多個(gè)子網(wǎng)，則會(huì )廣播所有子網(wǎng)。OPC服務(wù)器7-42 DriveWindow 2設備請求組該組定義用于查詢(xún)DDCS/UDP設備存在的參數。如果您無(wú)法連接到DDCS/UDP設備，可以嘗試增加Tries和/或Response Wait。缺點(diǎn)是連接和可能斷開(kāi)連接的時(shí)間將增加。該組包含：?Tries定義如果使用廣播方法并且查詢(xún)IP地址的最大嘗試次數，則發(fā)送廣播消息的次數。?響應等待是對查詢(xún)的響應等待的時(shí)間（廣播方法）或最長(cháng)時(shí)間（IP地址）。?Parallel Requests是在開(kāi)始等待響應之前發(fā)送的查詢(xún)消息數。?在廣播查詢(xún)中使用靜音時(shí)間，以防止已找到的DDCS/UDP設備在繼續進(jìn)行廣播查詢(xún)時(shí)引起不必要的響應。OPC服務(wù)器DriveWindow 2 7-43 DDCS讀取超時(shí)組該組定義各種DDCS讀取消息的超時(shí)。如果在找到DDCS/UDP設備（DDCS/UDP配置對話(huà)框中的測試按鈕）時(shí)，在DDCS網(wǎng)絡(luò )中找到連接到DDCS/UDP的驅動(dòng)器時(shí)遇到困難，可以嘗試增加標識超時(shí)。缺點(diǎn)是連接時(shí)間會(huì )增加。通過(guò)限定DDCS節點(diǎn)組中的節點(diǎn)數量，可以補償增加的數量。請注意，狀態(tài)和數據超時(shí)可以顯著(zhù)延長(cháng)，而不會(huì )降低通信速度，因為它們實(shí)際上在UDP消息丟失時(shí)生效。如果系統軟件備份/恢復有問(wèn)題，可以嘗試增加數據讀取超時(shí)。該組包含：?狀態(tài)定義DDCS/UDP設備DDCS寄存器讀取的超時(shí)。?日期定義從DDCS網(wǎng)絡(luò )中的驅動(dòng)器獲取響應的超時(shí)。?Identify告訴在查詢(xún)DDCS網(wǎng)絡(luò )中的驅動(dòng)器是否存在時(shí)等待驅動(dòng)器響應的最長(cháng)時(shí)間。請注意，文件DWC_def.ini的[DWC_DDCS]部分中的recshorttimeout_ms可以延長(cháng)所有設備的超時(shí)時(shí)間。OPC服務(wù)器7-44 DriveWindow 2 DDCS節點(diǎn)組該組定義驅動(dòng)器的節點(diǎn)號以及DDCS/UDP設備的DDCS網(wǎng)絡(luò )中是否存在分支單元。這些設置用于縮短啟動(dòng)時(shí)間，以防您對DDCS網(wǎng)絡(luò )有詳細了解。通常，查詢(xún)DDCS網(wǎng)絡(luò )中所有節點(diǎn)號（1…254）的存在，并默認假設存在分支單元。該組包含：?節點(diǎn)列表是一個(gè)以逗號分隔的節點(diǎn)列表或驅動(dòng)器節點(diǎn)編號的節點(diǎn)范圍，可查詢(xún)是否存在。范圍-n表示1-n，n-表示n-254。?分支單元可用于指定DDCS/UDP設備的DDCS網(wǎng)絡(luò )中沒(méi)有分支單元。設備地址組該組定義IP地址（固定IP）或IP地址和子網(wǎng)掩碼（遠程子網(wǎng)）。
A Remote Subnet is skipped at connection time if its size exceeds the limits defined in the Remote Subnet Size group. The group contains: ? Maximum defines the maximum size of a remote subnet. ? Absolute maximum is used instead in case it is less than Maximum. OPC Server DriveWindow 2 7-41 Search Devices group The group defines, whether the broadcast methods are used to search DDCS/UDP devices at connection time or not. Typically you never use both of them. The group contains: ? Near means that local Ethernet segment UDP broadcast (IP=255.255.255.255, RFC 919) is used. ? Intranet means that the PC subnet UDP broadcast (IP=IP or not subnet mask, RFC 922) is used. Note that if the PC belongs to several subnets, all of them are broadcasted. OPC Server 7-42 DriveWindow 2 Device Request group The group defines parameters for querying presence of DDCS/UDP devices. If you have trouble to connect to DDCS/UDP devices, you can try to increase Tries and/or Response Wait. The drawback is that connect and possibly disconnect times will increase. The group contains: ? Tries defines how many times a broadcast message is sent if a broadcast method is used and maximum number of tries an IP address is queried. ? Response Wait is the time (broadcast methods) or maximum time (IP address) a response to a query is waited for. ? Parallel Requests is the number of query messages sent before starting to wait responses. ? Mute Time is used in broadcast queries to prevent already found DDCS/UDP devices causing unnecessary responses while further broadcast queries are still made. OPC Server DriveWindow 2 7-43 DDCS Read Timeout group The group defines timeouts for various DDCS read messages. If you have trouble to find the drives in the DDCS network connected to the DDCS/UDP device when the DDCS/UDP device is found (Test button in DDCS/UDP Configuration dialog box), you can try to increase Identify timeout. The drawback is that connect time will increase. By delimiting number of nodes in the DDCS Nodes group you can compensate the increase. Note that Status and Data timeouts can be prolonged considerably without slowing down the communication speed because they actually take effect just when an UDP message is lost. If you have problems with system software backup/restore you can try to increase the Data read timeout. The group contains: ? Status defines the timeout for DDCS/UDP device DDCS register read. ? Date defines the timeout for getting response from a drive in the DDCS network. ? Identify tells the maximum time to wait a response from a drive in the DDCS network when querying its presence.Note that the timeout for all devices can be prolonged by recshorttimeout_ms in the [DWC_DDCS] section of the file dwc_def.ini. OPC Server 7-44 DriveWindow 2 DDCS Nodes group The group defines the node numbers of drives and whether there is a branching unit in the DDCS network of the DDCS/UDP device. These settings are used for shortening the start-up time in case you have detailed knowledge about the DDCS networks. Typically presence of all node numbers (1...254) in a DDCS network is queried and the presence of branching units is assumed by default. The group contains: ? Node List is a comma separated list of nodes or node ranges of drive node numbers, presence of which are queried. A range -n means 1-n and n- means n-254. ? Branching Unit can be used to specify that there are no branching units in the DDCS network of the DDCS/UDP device. Device Addresses group The group defines the IP address (Fixed IP) or an IP address and subnet mask (Remote Subnet).
