Chapter 14 Remote I/O Communication Module AHRTU-PFBS The above explanation is based on the connection between master and AHRTU-PFBS-5A. The mapping relationships between D registers in the master PLC and the configured modules of the slave are related with the master parameters settings. For more details on setting, please refer to section 10.3.2 in the SYCON.net help. The starting addresses of the INPUT and OUTPUT areas that AH PLC assigns to the master module are D1000 and D6000 respectively as the two figures show above. 14-77