Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual page 118

■Stations supporting safety communications (for redundant line)
Safety communications can be performed between the following stations (safety stations).
Control system master station (safety station) (1)  Intelligent device station (safety station) (2)
Standard communications
Safety communications
(1)
(2)
(3)
Standard station (3) can be mixed in one network for system configuration. However, safety communications
cannot be performed. Only standard communications can be performed.
■How to count the number of safety connections
The maximum number of safety connections per network is 120. If exceeding this limit, safety communications are not
guaranteed. The number of safety connections can be calculated using the following:
• For a redundant master station
Number of safety connections = Sum of the number of safety connections set in each intelligent device station
The number of safety connections with intelligent device stations varies depending on the combination of
modules set to the SIL2 mode. For details, refer to the following.
 MELSEC iQ-R Module Configuration Manual
• For redundant line
Number of safety connections = Sum of the number of safety connections set in each intelligent device station
The number of safety connections includes those for the control system network only. The number of safety
connections with intelligent device stations varies depending on the combination of modules set to the SIL2
mode. For details, refer to the following.
 MELSEC iQ-R Module Configuration Manual
1 FUNCTIONS
116
1.8 Safety Communication Function
(1)