Mitsubishi Electric MELSEC iQ-R Series Configuration Manual page 10

[Design Precautions]
CAUTION
● 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.
● During control of an inductive load such as a lamp, heater, or solenoid valve, a large current
(approximately ten times greater than normal) may flow when the output is turned from off to on.
Therefore, use a module that has a sufficient current rating.
● After the CPU module is powered on or is reset, the time taken to enter the RUN status varies
depending on the system configuration, parameter settings, and/or program size. Design circuits so
that the entire system will always operate safely, regardless of the time.
● Do not power off the programmable controller or reset the CPU module while the settings are being
written. Doing so will make the data in the flash ROM and SD memory card undefined. The values
need to be set in the buffer memory and written to the flash ROM and SD memory card again. Doing
so also may cause malfunction or failure of the module.
● When changing the operating status of the CPU module from external devices (such as the remote
RUN/STOP functions), select "Do Not Open by Program" for "Opening Method" of "Module
Parameter". If "Open by Program" is selected, an execution of the remote STOP function causes the
communication line to close. Consequently, the CPU module cannot reopen the line, and external
devices cannot execute the remote RUN function.
[Precautions for using digital-analog converter modules and high speed digital-analog
converter modules]
● Power on or off the external power supply while the programmable controller is on. Failure to do so
may result in incorrect output or malfunction.
● At on/off of the power or external power supply, or at the output range switching, a voltage may occur
or a current may flow between output terminals for a moment. In this case, start the control after
analog outputs become stable.
[Precautions for using high-speed counter modules and flexible high-speed I/O control
modules]
● Do not install the control lines or communication cables together with the main circuit lines or power
cables. Keep a distance of 150mm or more between them. Failure to do so may result in malfunction
due to noise.
[Precautions for using Safety CPUs]
● When selecting external devices to be connected to the CC-Link IE Field Network remote I/O module
(with safety functions), consider the maximum inrush current described in the CC-Link IE Field
Network Remote I/O Module (With Safety Functions) User's Manual. Exceeding the maximum inrush
current may cause malfunction or failure of the module.
[Precautions for using remote head modules]
● After the remote head module is powered on or is reset, the time taken to enter the RUN status varies
depending on the system configuration and/or parameter settings. Design circuits so that the entire
system will always operate safely, regardless of the time.
● Do not power off or reset the remote head module while the parameters are being written. Doing so
may cause malfunction or failure of the module.
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