Mitsubishi Electric MELIPC MI5000 Series User Manual page 80

■If no response from the slave station
If the master station is unable to receive a response from the slave station because of the slave station power being
interrupted or a cable disconnected, etc. then the master station will wait for a response from the slave station for the timeout
period specified in link scan settings, and will disconnect slave stations from which there was no response within the set
disconnect detection count.
In these cases, this is different to a data link error, and a cyclic transmission error (slave station) error (error code: CFE8H) will
be generated.
(1)
Ls
Ls
Ö
Ls
Ö
Ls
Ö
×
(Slave station disconnection detection settings: Data timeout period = 500 ms, count = 3 times)
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.
 An error such as the slave station power being interrupted or a cable disconnected, etc. has occurred, therefore slave
station 2 cannot return a response to the master station.
 The master station cannot receive a response from slave station 2, so it waits for a response from slave station 2 until the
timeout period (500 ms) has passed, and then sends a request to slave station 1 / slave station 2. However, because there is
no response from slave station 2, the link scan time is extended until the timeout period (500 ms).
 The master station is unable to receive a response from the slave station 2 within the disconnect detection count (3 times),
therefore the master station disconnects slave station 2.
The following table shows the operations of special relays and special registers when a slave station which did not send a
response is disconnected.
Special relay, special register
'Cyclic transmission status' (SM1536)
'Cyclic transmission status of each station' (SD1536
to SD1539)
'Data link status' (SM1540)
'Data link status of each station' (SD1540 to
SD1543)
7 CC-Link IE Field Network Basic FUNCTION
78
7.1 Cyclic Transmission
(2)
Ò
Ó
Ò
Ó
Ò
Ó
Ò
Ó
Ò
Operation
The device remains ON.
The bit corresponding to the station number of the disconnected slave station turns OFF.
OFF to ON
The bit corresponding to the station number of the disconnected slave station turns ON (indicating that
the slave station is an error station).
(3)
Ô
Õ