Mitsubishi Electric CC-Link IE Basic Reference Manual page 25

Setting method
Assignments of link devices are configured in "Network Configuration Settings". ( Page 35 Network Configuration
Settings)
Assignments for link refresh are configured in "Refresh Settings". ( Page 40 Refresh Settings,  Page 41 CC-Link IEF
Basic Setting)
Groups of slave stations (16 stations maximum) individually perform the cyclic transmission. ( Page 30
Group number setting)
For assignments of link devices and ones for link refresh, however, there is no to consider the groups.
Data flow of cyclic transmission
The following describes the data flow of cyclic transmission.
■Basic operation
The master station sends a request to all slave stations (including Ethernet devices within the same network address).
After receiving responses from all slave stations set with parameters, the master station starts sending another request. The
link scan refers to the operation from sending a request to sending another request and the link scan time refers to the time
required for a link scan. ( Page 28 Operation of the link scan)
Master station
Ò
Ls
(1)
Ò
Ls
(1)
Ò
Ls: Link scan
 The master station sends a request to slave station 1 and slave station 2.
 Slave station 1 sends a response to the master station.
 Slave station 2 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.
• When the master station sends a request (starts cyclic transmission) to all slave stations, 'Cyclic
transmission status' (SM1536) turns on, and when the master station receives responses from each slave
station, a bit, that is corresponding to the station number of the slave stations which have sent a response,
of 'Cyclic transmission status of each station' (SD1536 to SD1539) turns on.
• When the master station starts cyclic transmission, if no response has been received from a slave station,
the applicable slave station is not detected as a faulty station. (The 'Data link status' (SM1540) does not turn
on.) In addition, the transmission status of CC-Link IE Field Network Basic diagnostics becomes "Unfixed".
• When slave stations are divided into groups, each of the groups performs the cyclic transmission. For the
data flow of group number setting, refer to the following.
Page 31 Data flow of cyclic transmission
Slave station 1
Ó
Ó
Slave station 2
Ô
Ô
7 FUNCTIONS
23
7.1 Cyclic Transmission
7