Mitsubishi Electric CC-Link IE Basic Reference Manual page 33

Data flow of cyclic transmission
The following describes the data flow of cyclic transmission of when the group number setting is used.
■Basic operation
The master station sends requests, that vary from a group to group, to all salve stations. Although slave stations receive
multiple request messages from the master station, each slave station handles a request message for a group where each
slave stations belong to.
After receiving responses from all the slave stations in a group, the master station starts sending another request to the group.
For this reason, link scan times vary from group to group.
Since the link scan setting can be configured for each group, the setting can be according to response processing times of
each group. ( Page 39 Link Scan Setting)
Master station
Ò
Ls2
Ls1
(2)
(1)
Ò
Ls2
(2)
Ls1
Ls2 (1)
Ò
Ls1: Link scan of group 1
Ls2: Link scan of group 2
 The master station sends requests to slave station 1 and slave station 2 that belong to group 1.
 Slave station 1 sends a response to the master station.
 Slave station 2 sends a response to the master station.
 The master station sends requests to slave station 3 that belongs to group 2.
 Slave station 3 sends a response to the master station.
(1) Once the master station has received responses from slave station 1 and slave station 2, the master station starts sending another request.
(2) Once the master station has received a response from slave station 3, the master station starts sending another request.
Setting method
The group number setting is configured in "Network Configuration Settings". ( Page 35 Network Configuration Settings)
Group No.1
Slave station 1
Ó
Ó
Slave station 2
Õ
Ö
Ô
Õ
Ö
Ô
Group No.2
Slave station 3
7 FUNCTIONS
31
7.1 Cyclic Transmission
7