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Specifications Common to All Basic I/O Units Section 4-2
4-2-2 TS Indicator
The TS indicator is a 2-color LED. The color of the TS indicator, and whether it
is lit or not, indicate the following:
Note The meanings of the TS indicator for Communications Units, differ
from those for I/O Units. For details, refer to page 200.
Indicator Color State Meaning
TS Green Lit Normal communications
Red Lit I/O Unit interface error
--- Not lit Under initialization, or no power supplied
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