Program OptimizationPage 6-14 ABB Control - AC 311SBC 260400 R1001-b 06.995.3. ProgrammingData exchange may be carried out directly through the inputs/outputs or by using functionblocks.Exchange through inputs/outputs is particularly well adapted with a low number of data.5.3.1. Bit transmissionFigure 6-9 : Bit transmissionThe master central unit will receive the binary information from the slave central unit in theIxx.00 to Ixx+N.15 inputs, N+1 being the number of bits to transmit from the slave central unitto the master slave unit modulo 16.The slave unit will send the information through the O00.00 to ON.15 outputs.The master central unit will send the binary information to the slave central unit through theOxx.00 to O(xx+M).15 outputs, (M+1) being the number of bits to transmit from the mastercentral unit to the slave central unit modulo 16.The slave central unit will receive this information in the I00.00 to IM.15 inputs.The N and M values may be different.For example : The transmission of the "VALUE_M00" bit value from the slave 20 central unit tothe master central unit and the transmission of the "VALUE_FOR_SLAVE" bit value from themaster central unit to the slave 20 central unit.CU master CU slaveAddress xxCS 31 bus
