MVI71-DFNT
标签说明
交换通常在读取浮点数据时使用，交换读取的数据
将从设备放入模块内存之前。对于
例如，您从从属服务器（ABCD）接收4字节的数据。
0=无交换（ABCD）
1=切换的字对（CDAB）
2=字节和字交换（DCBA）
3=交换的字节（BADC）
节点网络上要从中读取数据或写入数据的设备的节点地址
数据发送至。有效地址为1到247。地址0保留给
广播写入命令（将向所有
网络上的设备）。
Func确定要在命令中发出的Modbus功能代码
从设备。此字段的有效值如下所示：
1=读取线圈状态
这将读取Modbus地址0001至9999。这些位值
指示线圈状态。使用功能代码5或15写入这些
寄存器
2=读取输入线圈
这将读取Modbus地址10001至29999。Like功能代码
1，这些也是位值，但函数代码2的值是只读的
数据值。使用功能代码5或15写入这些寄存器
3=读取保持寄存器
这将读取Modbus地址40001至47999。这是一个16位字
价值使用功能代码6和16写入这些寄存器。
4=读取输入寄存器
这将读取Modbus地址30001至39999。这些也是16位
word值，但为只读数据。Modbus主机无法写入
到这些寄存器。
5=强制（写入）单线圈状态
这将写入Modbus地址0001至9999。此命令将
仅写入一个线圈。使用功能代码15写入多个线圈。
6=预设（写入）单个寄存器
这将写入Modbus地址40001至47999。此命令
将单个寄存器值写入从设备。使用功能代码
16写入多个寄存器。
15=强制（写入）多线圈
这将向从机地址0001至9999写入多个线圈值。
16=预设（写入）多寄存器
这将在地址处向从设备写入多个寄存器值
40001至49999。

Label Description Swap Typically used when reading floating-point data, swaps the data read from the Slave device before it is placed into the module memory. For example, you receive 4 bytes of data from the Slave (ABCD). 0 = No swapping (ABCD) 1 = Word pairs switched (CDAB) 2 = Bytes and words switched (DCBA) 3 = Bytes swapped (BADC) Node Node address of the device on the network to read data from, or write data to. Valid addresses are 1 to 247. Address 0 is reserved for broadcast write commands (will broadcast a Write command to all devices on the network). Func Determines the Modbus function code that to issue in the command to the Slave device. Valid values for this field are as follows: 1 = Read Coil Status This will read Modbus addresses 0001 to 9999. These bit values indicate coil status. Use Function Code 5 or 15 to write to these registers 2 = Read Input Coils This will read Modbus addresses 10001 to 29999. Like Function Code 1, these are also bit values, but Function Code 2 values are Read Only data values. Use Function Code 5 or 15 to write to these registers 3 = Read Holding Registers This will read Modbus addresses 40001 to 47999. This is a 16-bit word value. Use Function Codes of 6 and 16 to write to these registers. 4 = Read Input Registers This will read Modbus addresses 30001 to 39999. These are also 16-bit word values, but are Read Only data. The Modbus Master cannot write to these registers. 5 = Force (Write) Single Coil Status This will write to Modbus addresses 0001 to 9999. This command will write to only one coil. Use Function Code 15 to write to multiple coils. 6 = Preset (Write) Single Register This will write to Modbus addresses 40001 to 47999. This command writes a single register value out to a Slave device. Use Function Code 16 to write to multiple registers. 15 = Force (Write) Multiple Coil This will write multiple coil values to the Slave addresses 0001 to 9999. 16 = Preset (Write) Multiple Register This will write multiple register values to the Slave device at addresses 40001 to 49999.