Output Modules - Mitsubishi Electric MELSEC iQ-R Series User Manual

Output modules

Precautions common to all output modules
■Maximum switching frequency when L 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, 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 necessary to select a module on the basis of the average current, to
alleviate the effect of the inrush current, take any of the following corrective actions:
• Connecting a resistor in series with the load
Resistor Load
Output
module
• Connecting an inductor in series with the load
Inductor Load
Output
module
Precautions when using the transistor output module
■Measures against reverse current
In the following connections, a reverse current flows to the output element, which can cause failure.
When wiring, set up diodes as the following figures show:
• When connecting transistor output modules in parallel
Sink type
Load
OUT1
Load
OUT2
COM
OUT1
OUT2
COM
• When providing another circuit in parallel with a transistor output module
Sink type
Additional circuit
OUT
COM
Source type
Load
OUT1
Load
OUT2
COM
OUT1
OUT2
COM
Source type
Additional circuit
OUT
COM
6 INSTALLATION AND WIRING
6.1 Before Using the I/O Modules
6
95