{"id":40513,"date":"2026-01-12T20:00:00","date_gmt":"2026-01-13T01:00:00","guid":{"rendered":"https:\/\/www.dmcinfo.com\/?p=40513"},"modified":"2026-01-07T14:16:01","modified_gmt":"2026-01-07T19:16:01","slug":"integrating-ethercat-into-custom-applications","status":"publish","type":"post","link":"https:\/\/www.dmcinfo.com\/blog\/40513\/integrating-ethercat-into-custom-applications\/","title":{"rendered":"Integrating EtherCAT into Custom Applications"},"content":{"rendered":"\n

Applications such as advanced industrial control systems and robotics require precise motion control, synchronized data sampling, and fast deterministic field buses. Traditional Ethernet TCP\/IP, CAN or Modbus-based systems lack the speed, coordination, and scalability required for these applications.<\/p>\n\n\n\n

That\u2019s where EtherCAT comes in.<\/p>\n\n\n\n

Originally developed by Beckhoff, EtherCAT (Ethernet for Control Automation Technology) has become one of the most popular real-time industrial Ethernet standards. It\u2019s fast, reliable, and highly scalable – making it an excellent fit for applications where timing and performance are critical.<\/p>\n\n\n\n

Why EtherCAT Fits High-Performance Embedded Applications<\/h2>\n\n\n\n

EtherCAT\u2019s efficiency comes from how it moves data. EtherCAT masters can use standard off the shelf ethernet hardware, and they transmit standard Ethernet frames with the EtherCAT EtherType Identifier. The entire EtherCAT data payload (EtherCAT Telegram) for the entire network is embedded into the Ethernet payload. Every device on the network is daisy-chained together, and each device allows the entire Ethernet frame to pass through it, imparting minimal delay on the entire message. Each device will read out its section (Datagram) of the EtherCAT Telegram and insert the data that it is sending back to the master. This all happens on the fly as the frame is effectively passing through the device. The last device on the network will then turn the frame around and send it back up to the master. This is possible because of the full-duplex nature of Ethernet.<\/p>\n\n\n\n

\"EtherCAT<\/figure>\n\n\n\n

The following image shows how an EtherCAT frame might traverse through a network. The master transmits the frame, and each device will extract data in the Datagram addressed to it and insert its data on the fly into the Datagram. In this example very simple addressing is used as an example, most of the time such positional addressing is only used at network boot-up\/discovery. Data not addressed to the slave is passed through the network until it reaches the end of the network, where the last slave sends it back to the master.<\/p>\n\n\n\n

\"EtherCAT<\/figure>\n\n\n\n

This \u201cprocessing on the fly\u201d approach eliminates most of the traditional Ethernet delays caused by the need to address each device individually and enables cycle times in the tens of microseconds, with minimal jitter.<\/p>\n\n\n\n

The protocol can also implement a feature called Distributed Clocks (DC), where the master can measure time, it takes for each device to receive and respond to a sync message, then provide each device with an offset to ensure all devices are synchronized within ~100ns of each other. This allows each EtherCAT controller to create a synchronization event for each device on the network within 100ns of each other.<\/p>\n\n\n\n

For custom devices, that means:<\/p>\n\n\n\n