Mitsubishi Electric MELSEC iQ-R C Series Programming Manual page 48

*7 When '0 (0H)' or '125 (7DH)' is specified for the station number, a specified control station of the network, which is specified for the
network number, is accessed. To access the current control station (a station that is actually operating as the control station), specify the
station number from 1 (1H) to 120 (78H).
*8 When '0 (0H)' or '125 (7DH)' is specified for the station number, a master station of the network, which is specified for the network
number, is accessed.
1 COMMON ITEMS
46
1.3 MELSEC Data Link Functions