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[Design Precautions]
!
WARNING
When connecting a peripheral with the programmable controller CPU or connecting a personal
computer with an intelligent function module to modify data of a running programmable
controller, configure an interlock circuit in the sequence program to ensure that the entire
system will always operate safely. For other forms of control (such as program modification or
operating status change) of a running programmable controller, read the relevant manuals
carefully and ensure that the operation is safe before proceeding. Especially, when a remote
programmable controller is controlled by an external device, immediate action cannot be taken if
a problem occurs in 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.
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.
!
CAUTION
Do not install the control lines or communication cables together with the main circuit lines or
power cables. Keep a distance of 100mm (3.94 in.) or more between them. Failure to do so may
result in malfunction due to noise.
Reset the CPU module or remote I/O module after changing its parameters. Failure to do so
may cause malfunction because the previous parameter settings remain in the module.
[Installation Precautions]
!
CAUTION
Use the programmable controller in an environment that meets the general specifications in the
user’s manual for the CPU module used. Failure to do so may result in electric shock, fire,
malfunction, or damage to or deterioration of the product.
To mount the module, while pressing the module mounting lever located in the lower part of the
module, fully insert the module fixing projection(s) into the hole(s) in the base unit and press the
module until it snaps into place. Incorrect mounting may cause malfunction, failure or drop of the
module. When using the programmable controller in an environment of frequent vibrations, fix
the module with a screw.
Tighten the screws within the specified torque range. Undertightening can cause drop of the
screw, short circuit, or malfunction. Overtightening can damage the screw and/or module,
resulting in drop, short circuit, or malfunction
Shut off the external power supply (all phases) used in the system before mounting/removing a
module or connecting/disconnecting a connector. Failure to do so may result in damage to the
product. Modules can be replaced online on a remote I/O station where a remote I/O module
with function version D or later is used. Note that there are restrictions on the modules that can
be replaced online, and each module has its predetermined replacement procedure. For details,
refer to the relevant section in this manual.