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Link scan time after timeout
If a timeout occurs due to the failure of a slave device, the link scan time will be changed depending on the setting value of the
timeout time.
• When the timeout time is shorter than the link scan time, the module operates with the value set for "Link Scan Time" in
"CC-Link IEF Basic Setting". (Page 138 CC-Link IEF Basic setting)
• When the timeout time is longer than the link scan time, the module operates with a link scan time which is equivalent to the
time set for "Time-out Period" in "Link Scan Setting". (Page 141 Link scan setting)
• To lessen the impact on communications with normal slave stations by transmission delay, modify a timeout
time. (Page 141 Link scan setting)
For example, using the CC-Link IE Field Network Basic diagnostics, check the current link scan time (when
all slave stations are operating normally), and then set a value, which is about five times as long as the link
scan time, for the timeout time. (When the current link scan time is 10 ms, set 50 ms for the timeout time.)
• The delay in the link scan time caused by a timeout can be checked in 'Accumulated number of timeouts'
(Un\G1063). (Page 144 Acquiring diagnostic information of slave stations)
■An error response received from a slave station
The master station immediately disconnects the slave station regardless of the timeout time and the number of times for
disconnection detection set in the link scan setting.
The operations of special relays and special registers when a slave station is disconnected are as follows:
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)
Some slave stations are equipped with a function that makes them disconnected without being an error
station. For details, refer to the manual of the slave station used. (Since the slave station does not become an
error station, 'Data link status' (SM1540) and 'Data link status of each station' (SD1540 to SD1543) do not
change.)
Operation
The device remains ON.
The bit corresponding to the station number of the disconnected slave station turns OFF.
The device turns OFF and ON.
The bit corresponding to the station number of the disconnected slave station turns ON (indicating
that the slave station is an error station).
7 CC-Link IE Field Network Basic FUNCTION
7.1 Cyclic Transmission Function
7
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