Mitsubishi Electric MELIPC MI5000 Series User Manual page 79

Setting method
Assign link devices in "Network Configuration Settings". (Page 177 Network Configuration Settings)
Assign link refreshes in "Refresh Settings". ( Page 182 Refresh Setting)
Cyclic transmission is performed for a group which consists of up to 16 stations. For assignments of link
devices and the one for link refreshes, however, the group number is not required to be taken into
consideration.
Cyclic transmission data flow
This shows the cyclic transmission data flow.
■Basic operation
The master station sends a request to all slave stations. (Including Ethernet devices within the same network address. After
sending requests to all slave stations, the master station starts another link scan after the set link scan time elapses. A 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 83 Link scan operation)
(1)
Ò
Ls
Õ
Ò
Ls
Õ
Ò
Ls: Link scan
(1) Master station
(2) Slave station 1
(3) Slave station 2
 The master station sends requests to slave station 1/slave station 2.
 Slave station 1 returns a response to the master station.
 Slave station 2 returns a response to the master station.
 After the configured link scan time elapses, the master station starts sending another request.
• When the master station sends a request (when a cyclic transmission is started) to all slave stations, 'Cyclic
transmission status' (SM1536) turns ON, and when the master station receives responses from each slave
station, a bit, which corresponds to the station number of the slave stations that 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 slave station is not regarded as an error station. ('Data link status' (SM1540) does not turn ON.) In
addition, the transmission status of CC-Link IE Field Network Basic diagnostics becomes "Unfixed".
(2)
Ó
Ó
(3)
Ô
Ô
7 CC-Link IE Field Network Basic FUNCTION
77
7.1 Cyclic Transmission
7