Firmware compatibility

Beckhoff EtherCAT devices are delivered with the latest available firmware version. Compatibility of firmware and hardware is mandatory; not every combination ensures compatibility. The overview below shows the hardware versions on which a firmware can be operated.

Note

It is recommended to use the newest possible firmware for the respective hardware
Beckhoff is not under any obligation to provide customers with free firmware updates for delivered products.

Notice

Risk of damage to the device!

Pay attention to the instructions for firmware updates on the separate page.
If a device is placed in BOOTSTRAP mode for a firmware update, it does not check when downloading whether the new firmware is suitable.
This can result in damage to the device! Therefore, always make sure that the firmware is suitable for the hardware version!

CU1521, CU1521-0010, CU1561

The converter firmware cannot be updated.

CU1521-0020

Hardware (HW)	Firmware (FW)	Revision no.	Release date
00	01	CU1521-0020-0000	2023/07
	02	CU1521-0020-0000	2025/03
	03	CU1521-0020-0000	2025/05
	04	CU1521-0020-0001	2025/08
02	06	CU1521-0020-0002	2026/05

	Firmware-Update of CU1521-0020 HW00-01: The converter can be updated via .rpd firmware file. HW02: The converter can be updated via .efw firmware file

Notice

The voltage must not be switched off when updating the firmware

The CU1521-0020 is damaged and can only be repaired by the service department.

Update via *.rpd firmware file (HW00-HW01)

The firmware version is displayed online in register x0E06, here: FW02

Update via *.efw firmware file (HW02)

The firmware version is displayed online in CoE register 0x100A, here: FW06

*) This is the current compatible firmware/hardware version at the time of the preparing this documentation. Check on the Beckhoff web page whether more up-to-date documentation is available.