not sure about support for distributed clocks, doubt it, but if it is supported, i would expect reference clock to be on EtherCat master, not slave such as EK1100. also for SunriseOS 1.8.1.x is quite old and you need to use WoV version 3.0.9.122.
personally i would consider upgrading to newer OS but keep in mind that PDS firmware is an issue too so migration need to be either gradual or PDS firmware has to be installed manually.
airconditioners and automatic transmissions have been used in cars for long time. it does not mean that every car must have them, or that cars without them are useless.
just because something is supported, it does not mean that every possible feature is needed or implemented. support can be partial and - this is usually the case. that is why compatibility lists exist.
EtherCat is used for internal working of KRC4 (KCB,KSB,KEB) and the goal here was to get certain functionality - efficiently... so that one can run several real time things at the same time (safety, motion control,...). Then same driver was used to offer cheap way for users to add I/O to controller.
want more features? get paid option like ProfiNet or EthernetIP.
i did not say that, i was just explaining that design choices may have influenced what features to implement and why often not all features are implemented. i see option in WoV to enable DC but i did not have need to DC yet and cannot speak if and what restrictions may apply.
