You can use any supported size to access the memory location.

For example, the address %MD48 would address bytes numbers 192, 193, 194, and 195 in the memory location area (48 * 4 = 192). The number of the first byte is 0.

You can access words, bytes and even bits in the same way: the address %MX5.0 allows you to access the first bit in the fifth word (Bits are generally saved wordwise).