In logical operations usually require some intermediate information element, they are not directly drive external load, intermediate staging effects, similar to a relay contact relay in the system. In the S7-200 series PLC, memory can be used as control relays to store the intermediate operational state and control information. General bits of the use.
Store 4 addressing modes that can be bit, byte, Word or double word to access the data in the memory.
position : m (bytes address]. [Address]: M0.3
Byte, Word or double word: m length][the starting byte address]: MB4 MW10 MD4
PLC ONE 