I am using SDO reads and writes to access the object dictionary. I can read from object 0x1800h sub 3 and it returns 0000h. But if I attempt to write a non zero value, it complains. I can read AND write to all other sub indexes within object 0x1800h as well as all other entries in the object dictionary.
There appears to be something weird going on with this entry. If the message is correct, it appears as though the object is not able to be changed.
I was hoping somebody on your end could attempt to write to this object and see if they see the same error.