Mitsubishi Electric L26CPU-BT User Manual page 164

(2) Precautions when using the block guarantee of cyclic data per station
(a) When using this function, be sure to make the auto refresh settings.
If the auto refresh settings have not been made for all devices, remote input (RX), remote output (RY) and
remote registers (RWr/RWw) in the buffer memory may not be refreshed.
The following message is displayed if the auto refresh settings have not been completed.
If this message is displayed, check the settings.
162