Mitsubishi Electric GOT1000 Series User Manual page 3

[DESIGN PRECAUTIONS]
 If a communication fails in data link, the faulty station holds the data link data
generated before the communication error. Create an interlock circuit in the
sequence program using the communication status information in order that
the system will operate safely.
Check the faulty station and the operation status during communication error
by referring to the relevant manuals.
 Some failures of cable or communication unit may cause the GOT to keep the
outputs on or off.
Create an external circuit for monitoring output signals that may lead to
serious accidents.
Failure to do so may cause mis-outputs or malfunctions, resulting in
accidents.
 If a communication error (including cable disconnection) occurs during
monitoring, the communication between the GOT and PLC CPU may be
interrupted and the GOT may be inoperative.
For bus connection : The PLC CPU is down and the GOT is inoperative.
For other than above: The GOT is inoperative.
When configuring a system including the GOT, the possibility of GOT
communication error must be considered; make sure the operation significant
for the system will be performed by switches on devices other than the GOT.
Failure to do so may cause mis-outputs or malfunctions, resulting in
accidents.
 To maintain the security (confidentiality, integrity, and availability) of the GOT
and the system against unauthorized access, DoS
viruses, and other cyberattacks from unreliable networks and devices via
network, take appropriate measures such as firewalls, virtual private networks
(VPNs), and antivirus solutions.
Mitsubishi Electric shall have no responsibility or liability for any problems
involving GOT trouble and system trouble by unauthorized access, DoS
attacks, computer viruses, and other cyberattacks.
*1 DoS: A denial-of-service (DoS) attack disrupts services by overloading
systems or exploiting vulnerabilities, resulting in a denial-of-service (DoS)
state.
WARNING
A-2
*1
attacks, computer