Toshiba TOSVERT VF-S15 series option unit Function E6581830 - Manual (Page 12)

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4.5. LED indicator
The LEDs shows the present status of the network and module
Refer to 7.3 for detail.
■ Layout of LED
L.RUN Light on during communication.
SD Light on during send the data of CC-Link.
RD Light on during receive the data of CC-Link.
L.ERR Light on during communication error.
SD
RD
L.RUN
L.ERR