Other Functions7-67.3 Hierarchy Link7.3.1 Overview49494949①②③494949494949494949494949abThis figure shows an example when a command is sent/received to/from a higher-order PCvia a relay station.① Source ⓐ Depth 0② Relay station ③ Destination ⓑ Depth 1 Hierarchy link function• Commands can be sent or received to link with PLCs in different hierarchies using a PLCwith multiple link units as a relay station.• The system using the FP7 MW Unit can consist of PLCs in a maximum of two hierarchies(depth 0 or depth 1).• For the hierarchy link, linked PLCs are specified by the hierarchy control command "LC" ofcommunication procedure "MEWTOCOL-COM". After sending the hierarchy controlcommand "LC", PLCs are controlled by sending/receiving MEWTOCOL commandsaccording to used applications.• In the system using the FP7 MW Unit, information on the transmission lines is held in case ofpower outage. Even after the occurrence of an instantaneous power failure, operation canbe continued. Send the hierarchy control command "LC" again for communicating with PLCsin different hierarchies.
