EtherCAT G 使用标准以太网的 1 Gbit/s 数据传输；而作为概念验证技术研究的 EtherCAT G1​​0 变体可实现高达 10 Gbit/s 的数据速率。与标准 100 Mbit/s EtherCAT 相比，数据速率的显着提高显着提高了可能的数据吞吐量。

 

性能和易用性一直是 EtherCAT 通信的标志。这同样适用于 EtherCAT G。不仅协议，而且基本机制和配置选项都保持不变。只有物理访问电缆所需的功能块已被 Gbit/s 变体取代。因此，主站不需要新软件，只需要一个 Gbit/s 端口——通常在任何情况下都存在。现有熟悉的电缆类型也可以继续使用：用于 EtherCAT G 的 Cat.5e 电缆或用于 EtherCAT G1​​0 的 Cat.6 电缆。

EtherCAT G 从站可以在现有的 EtherCAT 主站上运行，前提是它具有 Gbit/s 端口。目前正在为 EtherCAT G 准备几个特殊的协议扩展，以实现更高性能的使用。然而，主控端所需的扩展对于网络的运行并不是强制性的。

 

EtherCAT 和 EtherCAT G 可以在同一网络中运行，即 EtherCAT G 从站将在 100 Mbit/s EtherCAT 网络中工作，反之亦然。但是，在这种混合网络中，所有 EtherCAT G 设备都将切换回 100 Mbit/s 模式。为了防止这种情况，新的分支概念使 EtherCAT 分支成为可能，通过适当的速度实现，可以在 1 或 10 Gbit/s 网络中并行运行 100 Mbit/s 段。使用新的 EK1400 EtherCAT G 耦合器可以在 100 Mbit/s 网络上实现 EtherCAT G 网段的一个分支，从而允许在 EtherCAT G 网络环境中使用极其广泛的标准 EtherCAT 端子模块。EtherCAT G 通信段的 1 Gbit/s 速度保持不变。

分支概念提供了另一个重要的效率优势：小化传播时间。CU14xx 多端口分支控制器专为此目的而设计，可实现多个 EtherCAT 和 EtherCAT G 段的互连。单个分支由来自主站的单个电报寻址，然后将同时处理。这使得更短的信号传播时间和更短的通信和循环时间成为可能，因为一个段的电报直接从分支控制器传回主控，而不是通过所有其他连接的段。

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EtherCAT and EtherCAT G can be operated within the same network, i.e. EtherCAT G slaves will work in a 100 Mbit/s EtherCAT network and vice versa. However, all EtherCAT G devices will switch back to the 100 Mbit/s mode in such a mixed network. In order to prevent this, the new branch concept makes EtherCAT branches possible, which enable the parallel operation of 100 Mbit/s segments in a 1 or 10 Gbit/s network through appropriate speed implementations. A branch of an EtherCAT G segment can be implemented on a 100 Mbit/s network using the new EK1400 EtherCAT G Coupler, allowing the extremely wide range of standard EtherCAT Terminals to be used within the EtherCAT G network environment. The 1 Gbit/s speed of EtherCAT G communication segment is retained.

The branch concept offers another crucial efficiency benefit: minimised propagation times. The CU14xx multi-port branch controllers are designed for this purpose and enable the interconnection of several EtherCAT and EtherCAT G segments. Individual branches are addressed with a single telegram from the master, which will then be processed simultaneously. This makes shorter signal propagation times possible and shorter communication and cycle times, because the telegram of a segment travels directly from the branch controller back to the master and not through all other connected segments as well.

Disclosure and availability

In the coming months, the FB1400 EtherCAT G piggyback controller board will be available for the EL9820 EtherCAT evaluation kit. The FB1400 will have an FPGA with a fixed configuration as an EtherCAT G slave controller (ESC). If necessary, customers can then also create and use their own ESC configurations with the planned IP core for EtherCAT G.

his will give EtherCAT users as well as master and slave manufacturers ample opportunity to evaluate the new technology. Availability of the EK1400 EtherCAT G Bus Coupler is scheduled for the second half of 2019. It will offer branch controller functionality and enables direct connection of all EtherCAT Terminals as well as all other EtherCAT products in EtherCAT G networks. Further products will follow, such as 3-port and 8-port branch controllers, an EtherCAT G junction, an EtherCAT G10 branch controller and an EtherCAT G10 piggyback controller board.

A disclosure and introduction of the EtherCAT G/G10 protocol by the EtherCAT Technology Group (ETG) is planned for this autumn. As with EtherCAT more than 15 years ago, all ETG member companies will be able to use the extension and benefit from it.