[Design Precautions]
DANGER
Refer to this manual for information on each station's operating status in the event of a
communication error. Erroneous outputs and malfunctions may result in serious accidents.
Create a safety circuit outside the programmable controller to ensure the whole system will operate
safely even if a personal computer failure occurs.
Failure to do so may cause an accident due to an erroneous output or malfunction.
(1) Any of emergency stop circuits, protection circuits, interlock circuits for opposite operations such
as forward and reverse rotations or for a damage-preventive mechanism such as positioning by
setting high and low limits must be provided outside the programmable controller.
(2) The station to which the CC-Link IE Controller Network board (Q80BD-J71GP21-SX/Q80BD-
J71GP21S-SX) is installed may be disconnected from the data link due to a data link error. If this
occurs, the data output from the station and written to other stations before the error will be held until
the station is reconnected to the network (until its data link is restarted). Provide a mechanism for data
link status monitoring and error handling for each station that is connected to the data link system.