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6 INSTALLATION AND WIRING
6.1 Before Using the I/O Modules
Output module
Precautions common to all output modules
■Maximum switching frequency when load is driven
The maximum switching frequency imposes a limit on the use; an ON state or an OFF state must not be changed without an
interval of at least one second.
■Load to be connected
When connecting a counter or timer utilizing a DC/DC converter as a load of the output module, select an output module
whose maximum load current is higher than the inrush current of a load to be connected. If the selection is based on the
average current of a load to be connected, an inrush current flows cyclically from the load while the output module is in an ON
state or in operation, which can cause failure of the module. If it is necessary to select a module on the basis of the average
current of a load to be connected, to alleviate the effect of the inrush current, take any of the following corrective actions:
• Connecting a resistor in series with the load
• Connecting an inductor in series with the load
Output
module
Resistor
Load
Output
module
Inductor Load
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