TVOC-2-240-1SFA664001R1001 设备写入输出数据

TVOC-2-240 1SFA664001R1001 工业通信协议从设备读取输入数据

Modbus是一种主从式协议，其中一台设备为主设备，Modbus网络上的所有其他设备为从设备。Modbus主设备可以读取或写入设备，具体取决于从设备的能力。

那么这与PLC I/O有什么关系呢？PLC、数字仪表、SCADA系统、VFD和发电机组控制器等许多设备都设计有输入和输出点的内部数据图。设备设计者可以决定如何分配数据。例如，在我的工作中，我通常从功率计读取Modbus数据到我的PLC/PAC系统，这样我就可以知道电路或发电机上的千瓦、电压、安培等。在这种情况下，PLC充当Modbus主设备，而功率计是Modbus从设备。每个设备制造商在其设备的Modbus图中对数据的排序不同，但通信协议保持不变。

主器件也可以向从器件写入数据。例如，PLC可以设置为Modbus主机，写入数据以启动、停止或改变变频驱动器(VFD)的速度。

尽管所有通信协议的工作方式不同，但它们的设计目的基本相同。工业通信设备从其他PLC/设备读取模拟或离散值，并向其写入模拟或离散值，而无需在PLC/设备之间的每个输入和输出点进行硬连线。

注:大多数Allen-Bradley PLC/PACs必须使用第三方模块或网关设备通过Modbus进行通信。像Prosoft Technology、Sierra Monitor和Real Time Automation这样的公司在市场上可以买到许多这样的设备。

如您所见，您不仅可以将硬线输入和输出连接到PLC，还可以通过Modbus和其他工业通信协议从设备读取输入数据和向设备写入输出数据。这种多功能性允许大多数PLC/PACs与工业环境中的几乎任何设备接口。

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TVOC-2-240-1SFA664001R1001 设备写入输出数据

TVOC-2-240 1SFA664001R1001 Industrial communication protocol reads input data from the device

Modbus is a master-slave protocol in which one device is the master device and all other devices on the Modbus network are the slave devices. The Modbus master can read or write to the device, depending on the capabilities of the slave device.

So what does this have to do with PLC I/O? Many devices such as PLCS, digital meters, SCADA systems, VFDS, and generator set controllers are designed with internal data graphs of input and output points. The device designer can decide how to distribute the data. For example, in my job, I usually read Modbus data from the power meter to my PLC/PAC system so that I can know the kilowatts, voltage, amperes, etc. on the circuit or generator. In this case, the PLC acts as the Modbus master, while the power meter is the Modbus slave. Each device manufacturer sorts the data differently in the Modbus diagram of its devices, but the communication protocol remains the same.

The master device can also write data to the slave device. For example, a PLC can be set up as a Modbus host, writing data to start, stop, or change the speed of a variable frequency drive (VFD).

Although all communication protocols work differently, they are designed for basically the same purpose. Industrial communication devices read analog or discrete values from and write analog or discrete values to other PLCS/devices without having to hardwire each input and output point between PLCS/devices.

Note: Most Allen-Bradley PLC/PACs must communicate over Modbus using a third-party module or gateway device. Companies like Prosoft Technology, Sierra Monitor, and Real Time Automation can buy many of these devices in the market.

As you can see, you can not only connect hardwire inputs and outputs to the PLC, but also read input data from the device and write output data to the device via Modbus and other industrial communication protocols. This versatility allows most PLCS /PACs to interface with virtually any device in an industrial environment.

As you can see, you can not only connect hardwire inputs and outputs to the PLC, but also read input data from the device and write output data to the device via Modbus and other industrial communication protocols. This versatility allows most PLCS /PACs to interface with virtually any device in an industrial environment.

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