[Scanner] Target configuration data is restricted to 400 bytes

The current implementation of the EIP Core, the size of the application segment #2 is restricted to max values of 400 bytes. Therefore the stack is unable to establish a connection and goes into a block.

The actual limit shall be 510 bytes, which is the maximum that can be put into a single data segment when being transferred to an IO target in the ForwardOpen request.

Documentation must be also adapted accordingly (EIP_OBJECT_REGISTER_CONNECTEION_REQ).