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MELSEC-Q
1 GENERAL SPECIFICATIONS AND PRECAUTIONS FOR USE
(c) If the small number of value of input response time is set, the modules tend to
have impact of noise. Ensure that the modules do not have impact of noise.
For details of the measure against noise, refer to the QCPU User’s Manual
(Hardware Design, Maintenance and Inspection).
(d) The high-speed input modules connected with electric appliance such as
relays may load a chattering as a signal.
(e) To use a high-speed input module as a CE marked product, keep the cable
length 3m or less.
1.2.2 Output module
(1) Maximum switching frequency when the module drives inductive load
The output must be on for one second or longer and off for one second or longer.
(2) Load for connection
When connecting a counter or timer that has a DC-DC converter as a load, select
an output module whose maximum load current is larger than inrush current of the
load.
Selecting an output module by average current of the load may cause a failure of
the module because inrush current flows at a constant frequency at power-on or
during operation due to the connected load.
If an output module needs to be selected by average current of the load, take either
of the following actions to reduce an influence from inrush current.
• Connecting a resistor to the load in
series
• Connecting an inductor to the load in
series
(3) Replacement of fuses
Fuses installed to an output module cannot be replaced.
(4) Built-in fuses
Built-in fuses works to prevent the external cables from being burned when a short
circuit occurs in the internal output circuit. For this reason, the output module may
not be protected if the fuses blow any other reasons except for a short circuit.
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