Bytes read instruction immediately (MOV-BIR) reads the actual input IN the 1–byte values, and write OUT the result as the specified storage unit, but the input image register has not been updated.
Bytes write command immediately read from the input IN the specified storage unit 1 byte numerical and written (in bytes) of physical output point on the OUT side the actual output, it also flushes the output image that corresponds to the register
PLC ONE 