Note that the CAUTION level may lead to a serious consequence according
o the circumstances.
Always follow the instructions of both levels because they are important to
personal safety.
Please save this manual to make it accessible when required and always forward
t to the end user.
[DESIGN PRECAUTIONS]
DANGER
z If a communications error occurs to a device network, the node in such a
communications error will be in a state as follows:
(1) The master node (QJ71DN91) maintains input data which had been
received from the slave node before the error occurred.
(2) Whether the slave node’s output signal is turned off or maintained is
determined by the slave node’s specifications or the parameters set at
the master node. When using QJ71DN91 as a slave node, the entered
data from master node before the faulty node is maintained.
By referring to communications states of the slave node, arrange an
interlock circuit in a sequential program and provide safety mechanism
externally of the slave node in order the system to operate safely.