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Byte.Bit Addressing:To access a bit in a memory area, you specify the address, which includes the memory area identifier, the byte address, and the bit number.

I 3 4...

Memory Area IdentifierMemory area identifier

Byte address: byte 3 (thefourth byte)

Period separates the byteaddress from the bitnumber

Bit of byte, or bit number:bit 4 of 8 (0 to 7) 7 6 5 4 3 2 1 0

Byte 0Byte 1Byte 2Byte 3Byte 4Byte 5

Process–image Input (I) Memory Area.