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416NHM30030適配器接口卡件
寫塊ID是一個索引值，用于確定模塊中的位置將放置數據的數據庫。每次傳輸最多可移動200個字（塊偏移量1到200）。
選擇優先級讀取塊（寫入塊偏移247）
該寄存器允許處理器選擇將從單元如果該寄存器等于零，模塊將按順序返回所有讀取塊順序如果該寄存器具有非零值，模塊將返回所選的讀取塊，并且下面的一個。此功能可用于需要更新某些讀取塊的應用程序比其他區塊更頻繁。下圖顯示了更改Select Priority值的效果
讀取塊寄存器（寫入塊偏移量247）。在下面的直方圖曲線中，選擇優先級讀取塊等于0。特殊功能塊
特殊功能塊是用于請求來自單元初始化輸出數據（塊1000至1024）使用配置中的Initialize Output Data（初始化輸出數據）參數將模塊帶到重新啟動操作后的已知狀態。如果啟用了Initialize Output Data（初始化輸出數據）參數，當模塊執行重啟操作時，它將請求來自處理器中的ReadData數組，用于初始化模塊的ReadData區域內部數據庫。在例行操作期間，模塊連續循環通過用戶定義的SIE每個客戶端的客戶端x命令列表（第40頁），按命令的順序檢查命令列出，并在網絡上發送啟用的命令。然而，該模塊也有一個特殊的命令優先級隊列，它是一個保存命令的內部緩沖區
從特殊功能塊發送，直到可以在網絡上發送。
當命令優先級隊列中出現一個或多個命令時：
1例行輪詢過程暫時中斷。
2執行命令優先級隊列中的命令，直到隊列空的
3然后模塊返回到SIE Client x Command List上停止的位置繼續例行輪詢。
命令控制塊將命令放入模塊的命令優先級隊列。
命令控制與SIE客戶端x命令中已定義的命令一起使用列表SIE Client x Command List中的命令可以用于例行輪詢或禁用并排除在例行輪詢之外。禁用的命令在SIE.CONTROL.CmdControl。WriteCmdBits控制器標記設置為零（0）并被跳過
在例行輪詢期間。啟用的命令的位在WriteCmdBits控制器標記中設置為一（1），并在例行輪詢期間發送。然而，命令控制允許任何要添加到命令中的預定義SIE客戶端x命令列表中的命令優先級隊列，無論是否啟用例行輪詢。
命令控制還提供了使用梯形圖邏輯從以更高優先級執行的SIE客戶端x命令列表，如果在特殊情況下可能需要這樣的選擇。
單個命令控制塊請求最多可從SIE發出16條命令客戶端x命令列表放入命令優先級隊列。
Special Function Blocks
Special function blocks are optional blocks used to request special tasks from the module. Initialize Output Data (Blocks 1000 to 1024) Use the Initialize Output Data parameter in the configuration to bring the module to a known state after a restart operation. If the Initialize Output Data parameter is enabled, when the module performs a restart operation, it will request blocks of output data from the ReadData array in the processor to initialize the Read Data area of the module’s internal database.
The Write Block ID is an index value used to determine the location in the module’s database where the data will be placed. Each transfer can move up to 200 words (block offsets 1 to 200) of data. Select Priority Read Block (Write Block Offset 247) This register allows the processor to select which read blocks will be returned from the module. If this register equals zero, the module will return all read blocks in sequential order. If this register has a non-zero value, the module will return the read block selected, and the following one. This feature can be used for applications that require some read blocks to be updated more frequently than other blocks. The following illustrations show the effect of changing the value of the Select Priority Read Block register (Write Block offset 247). In the following histogram curve, the Select Priority Read Block is equal to 0.
During routine operation
the module continuously cycles through the user-defined SIE Client x Command List (page 40) for each Client, examining commands in the order they are listed, and sending enabled commands on the network. However, the module also has a special command priority queue, which is an internal buffer that holds commands from special function blocks until they can be sent on the network. When one or more commands appear in the command priority queue: 1 The routine polling process is temporarily interrupted. 2 The commands in the command priority queue are executed until the queue is empty. 3 Then the module goes back to where it left off on the SIE Client x Command List and continues routine polling. Command Control blocks place commands into the module’s command priority queue. Command Control is used with commands already defined in the SIE Client x Command List. Commands in the SIE Client x Command List may be either enabled for routine polling or disabled and excluded from routine polling. A disabled command has its bit in the SIE.CONTROL.CmdControl.WriteCmdBits controller tag set to zero (0) and is skipped during routine polling. An enabled command has its bit in the WriteCmdBits controller tag set to one (1) and is sent during routine polling. However, Command Control allows any command in the predefined SIE Client x Command List to be added to the command priority queue, whether it is enabled for routine polling or not. Command Control also gives you the option to use ladder logic to have commands from the SIE Client x Command List executed at a higher priority and out of routine order, if such an option might be required in special circumstances. A single Command Control block request can place up to 16 commands from the SIE Client x Command List into the command priority queue.
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