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416NHM30030适配器接口卡件
写块ID是一个索引值，用于确定模块中的位置将放置数据的数据库。每次传输最多可移动200个字（块偏移量1到200）。
选择优先级读取块（写入块偏移247）
该寄存器允许处理器选择将从单元如果该寄存器等于零，模块将按顺序返回所有读取块顺序如果该寄存器具有非零值，模块将返回所选的读取块，并且下面的一个。此功能可用于需要更新某些读取块的应用程序比其他区块更频繁。下图显示了更改Select Priority值的效果
读取块寄存器（写入块偏移量247）。在下面的直方图曲线中，选择优先级读取块等于0。特殊功能块
特殊功能块是用于请求来自单元初始化输出数据（块1000至1024）使用配置中的Initialize Output Data（初始化输出数据）参数将模块带到重新启动操作后的已知状态。如果启用了Initialize Output Data（初始化输出数据）参数，当模块执行重启操作时，它将请求来自处理器中的ReadData数组，用于初始化模块的ReadData区域内部数据库。在例行操作期间，模块连续循环通过用户定义的SIE每个客户端的客户端x命令列表（第40页），按命令的顺序检查命令列出，并在网络上发送启用的命令。然而，该模块也有一个特殊的命令优先级队列，它是一个保存命令的内部缓冲区
从特殊功能块发送，直到可以在网络上发送。
当命令优先级队列中出现一个或多个命令时：
1例行轮询过程暂时中断。
2执行命令优先级队列中的命令，直到队列空的
3然后模块返回到SIE Client x Command List上停止的位置继续例行轮询。
命令控制块将命令放入模块的命令优先级队列。
命令控制与SIE客户端x命令中已定义的命令一起使用列表SIE Client x Command List中的命令可以用于例行轮询或禁用并排除在例行轮询之外。禁用的命令在SIE.CONTROL.CmdControl。WriteCmdBits控制器标记设置为零（0）并被跳过
在例行轮询期间。启用的命令的位在WriteCmdBits控制器标记中设置为一（1），并在例行轮询期间发送。然而，命令控制允许任何要添加到命令中的预定义SIE客户端x命令列表中的命令优先级队列，无论是否启用例行轮询。
命令控制还提供了使用梯形图逻辑从以更高优先级执行的SIE客户端x命令列表，如果在特殊情况下可能需要这样的选择。
单个命令控制块请求最多可从SIE发出16条命令客户端x命令列表放入命令优先级队列。
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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