Mitsubishi Electric MELSEC iQ-R Series Migration Manual page 5

[Design Precautions]
●
Do not write any data to the "system area" and "write-protect area" of the buffer memory in the
module. Also, do not use any "use prohibited" signals as an output signal from the CPU module
to each module. Doing so may cause malfunction of the programmable controller system. For
the "system area", "write-protect area", and the "use prohibited" signals, refer to the user's
manual for the module used.
●
If a communication cable is disconnected, the network may be unstable, resulting in a
communication failure of multiple stations. Configure an interlock circuit in the program to
ensure that the entire system will always operate safely even if communications fail. Failure to
do so may result in an accident due to an incorrect output or malfunction.
●
To maintain the safety of the programmable controller system against unauthorized access from
external devices via the network, take appropriate measures. To maintain the safety against
unauthorized access via the Internet, take measures such as installing a firewall.
●
Configure safety circuits external to the programmable controller to ensure that the entire
system operates safely even when a fault occurs in the external power supply or the
programmable controller. Failure to do so may result in an accident due to an incorrect output or
malfunction.
●
If safety standards (ex., robot safety rules, etc.,) apply to the system using the module, servo
amplifier and servomotor, make sure that the safety standards are satisfied.
●
Construct a safety circuit externally of the module or servo amplifier if the abnormal operation of
the module or servo amplifier differs from the safety directive operation in the system.
●
Do not remove the SSCNETIII cable while turning on the control circuit power supply of
modules and servo amplifier. Do not see directly the light generated from SSCNETIII connector
of the module or servo amplifier and the end of SSCNETIII cable. When the light gets into eyes,
you may feel something wrong with eyes. (The light source of SSCNETIII complies with class1
defined in JISC6802 or IEC60825-1.)
WARNING
A - 3