Chapter 12 Network Module AH10PFBM 30. Return to the main interface of the software after downloading is completed. (Note: After downloading is completed, the three indicators of the master are all green and the digital display shows the node address of the master, which indicates that the network communication is normal.) 12.6.5 I/O Mapping Relations between Master PLC CPU and Slave PLC CPU The following interface shows the starting addresses and lengths of the OUTPUT area and INPUT area that PLC CPU assigns to the master module. The data in OUTPUT area are sent to the slave and the INPUT area receives the data from the slave. 12-47