2. Installation and Wiring
8
A location with a large amount of dust, salt or iron filings.
A location exposed to direct sunlight.
When installed inside a cabinet
When the system is installed inside a cabinet, observe the following precautions.
The cabinet in which the system is installed should be kept as far as possible from cabinets
containing a power or high voltage.
When there is a high frequency device or high frequency facility, make sure that the cabinet
in which this system is installed is securely grounded.
When using the same channel base in common with another cabinet, make sure that there is
no leakage current from the other cabinet or the device installed in it.
Ventilation
Since the intelligent PI/O system is cooled by natural air convection, in general it is not necessary
to have forced air cooling for each terminal block unit. However, it is normally necessary to have
an exhaust fan in the cabinet in which the system is installed in order to keep the ambient
temperature within the operating range. Estimate the required cooling capacity of the fans as the
total amount of heat generated by all of the modules.
See Chapter 3 for the amount of heat generated by each intelligent PI/O module.
Precautions in Mounting and Wiring
NOTICE:
Keep the input/output signal lines as far as possible from power lines and from devices
that generate electric and magnetic fields.
The effect of noise can cause misoperation or malfunction.
Do not drop the modules, let them bang into anything or apply strong shock.
Doing so can cause malfunction.
Observe the following precautions in mounting and wiring the intelligent PI/O system.
The PI/O modules are not of dust-resistant construction. If at all possible mount the system
inside a cabinet to protect it from dust.
Do not mount the system directly over products that produces a great deal of heat (heater,
transformer, large capacity resistor, etc.).
Do not mount inside the same panel with a high voltage device.
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