A-2
[DESIGN PRECAUTIONS]
DANGER
(3) Output could be left on or off when there is a fault in an output module
relay or transistor.
So build an external monitoring circuit that will monitor any output signal
that could cause serious accidents.
z
If load current more than the rating or overcurrent due to a short circuit in the
load has flowed in the output module for a long time, it may cause a fire and
smoke. Provide an external safety device such as a fuse.
z
Create the circuit so that the external power supply will turn on after the C
Controller system is powered on.
Turning on the external power supply first could result in accidents due to
erroneous output or operation.
z
For each station's operating status in the event of a each station error, refer
to the corresponding each station manual.
Not doing so could result in erroneous output or operation.
z
When controlling a running C Controller module (data modification) by
connecting a personal computer to the C Controller module, create an
interlock circuit on user programs so that the whole system functions safely
all the time.
This must be also done when performing any other controls (e.g. operating
status change (status control)) or operations instructed from the computer.
In these controls, especially the one performed from an external device to a
C Controller module in a remote location, some C Controller side problem
may not be resolved immediately due to failure of data communications.
To prevent this, create an interlock circuit on user programs and establish
corrective procedures for communication failure between the external device
and the C Controller module.
z
When setting up the system, do not allow any empty slot on the base unit.
If any slot is left empty, be sure to use a blank cover (QG60).
Otherwise, in the short circuit test or when an overcurrent or overvoltage is
accidentally applied to the external I/O section, internal parts of the module
may be flied.
CAUTION
z
Do not install the control wires or communication cables together with the
main circuit or power wires, or bring them close to each other.
Keep a distance of 100 mm (3.94 inch) or more between them.
Not doing so could result in malfunctions due to noise.
z
When controlling a lamp, heater or solenoid valve using an output module,
large current (approximately ten times greater than in normal conditions)
may flow when the output is turned ON from OFF.
Take preventive measures such as replacing the module with the one having
sufficient rated current.
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