IEC 62386-105:2020适用于控制装置和控制装置。 通常，根据IEC 62386(所有部件)的总线单元包含固件。在某些情况下，可能需要在产品生产或运输后更换固件。例如，如果总线单元不按预期操作。在这种情况下，经由接口的总线单元的固件更新是有益的。 这个固件更新过程主要是一个错误修复过程，而不是一个功能扩展过程。然而，固件更新过程可用于功能扩展。但重要的是要详细考虑对整个系统产生负面影响的风险。

IEC 62386-105:2020 applies to control gear and control devices.
Typically, a bus unit according to IEC 62386 (all parts) contains firmware. There are circumstances where it might be necessary to change the firmware after production or shipping of the product. For example if the bus unit does not operate as intended. In such a case, a firmware update of a bus unit via the interface is beneficial.
This firmware update process is primarily designed to be a bug fix process, not a feature extension process. Nevertheless the firmware update process can be used for feature extensions. But it is important that the risk of negative effects to the complete system is considered in detail.