Mitsubishi Electric QX10 User Manual page 3

[Design Instructions]
• When overcurrent exceeding the rated load current or caused by a shorted load or the like flows
in the output module for a long time, it may cause smoke or fire. To prevent this, configure an
external safety circuit, such as fuses.
• Build a circuit that turns on the external power supply after the PLC power supply has been
turned on. If the external power supply is turned on first, it could result in false output or
malfunction.
• When there are communication problems with the data link, refer to the corresponding data link
manual for the operating status of each station. Not doing so could result in false output or
malfunction.
• When connecting a peripheral device to the CPU module or connecting a personal computer or
the like to the intelligent function module to exercise control (data change) on the running PLC,
configure up an interlock circuit in the sequence program to ensure that the whole system will
always operate safely.
Also before exercising other control (program change, operating status change (status control))
on the running PLC, read the manual carefully and fully confirm safety.
Especially for the above control on the remote PLC from an external device, an immediate
action may not be taken for PLC trouble due to a data communication fault.
In addition to configuring up the interlock circuit in the sequence program, corrective and other
actions to be taken as a system for the occurrence of a data communication fault should be
predetermined between the external device and PLC CPU.
• Do not bundle the control wires or communication cables with the main circuit or power wires, or
run them close to each other.
They should be run 100mm (3.94in.) or more away from each other.
Not doing so could result in noise that would cause malfunction.
• When the output module is used to control a lamp load, heater, solenoid valve or the like, large
current (approximately 10 times greater than the normal) may flow when the output is turned
from OFF to ON. Choose an output module having a sufficient rated current.
A - 2
DANGER
!
CAUTION
!
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