Check the following points.

(1) CC-Link cables have been properly connected.
(2) Station numbers and the transmission speed have been correctly set.
(3) The Network Parameter setting "Station Information Setting" of the master station has been correctly set.
(4) The Network Parameter setting "Operation Setting" of the local station has been correctly set (to the same number of
      occupied stations as that set using "Station Information Setting" of the master station).
(5) Monitor the error code in link special registers SW0068 to SW006A of the master and local stations.