Mitsubishi QX10 User Manual page 4

[Design Precautions]
• In an output module, when a load current exceeding the rated current or an overcurrent caused
by a load short-circuit flows for a long time, it may cause smoke and fire. To prevent this,
configure an external safety circuit, such as a fuse.
• Configure a circuit so that the programmable controller is turned on first and then the external
power supply.
If the external power supply is turned on first, an accident may occur due to an incorrect output
or malfunction.
• For the operating status of each station after a communication failure, refer to relevant manuals
for each network.
Incorrect output or malfunction due to a communication failure may result in an accident.
• When changing data of the running programmable controller from a peripheral connected to the
CPU module or from a personal computer connected to an intelligent function module, configure
an interlock circuit in the sequence program to ensure that the entire system will always operate
safely.
For other controls to a running programmable controller (such as program modification or
operating status change), read relevant manuals carefully and ensure the safety before the
operation.
Especially, in the case of a control from an external device to a remote programmable controller,
immediate action cannot be taken for a problem on the programmable controller due to a
communication failure.
To prevent this, configure an interlock circuit in the sequence program, and determine corrective
actions to be taken between the external device and CPU module in case of a communication
failure.
• Do not install the control lines or communication cables together with the main circuit lines or
power cables.
Keep a distance of 100mm or more between them.
Failure to do so may result in malfunction due to noise.
• When a device such as a lamp, heater, or solenoid valve is controlled through an output module,
a large current (approximately ten times greater than normal) may flow when the output is
turned from off to on. Take measures such as replacing the module with one having a sufficient
current rating.
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WARNING
!
CAUTION
!
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