Advantech ADAM-5510/P31 Manual page 98

ADAM-5056D is designed to be implemented within the following
Advantech ADAM-5000 series main units:
ADAM-5000/485
ADAM-5000E
ADAM-5510
ADAM-5510/P31
ADAM-5056D is a 16-channel digital output W/ LED module, which is
based on ADAM-5056. In addition to the original functions inherited
from its predecessor, the ADAM-5056D is further enhanced with the
following features:
16 LED indicators are added to the panel. Users can monitor the status
of each channel at a glance. When a LED indicator is on, it means that
this channel is now in logic level "1" status. When a LED indicator is
off, it means this channel is in logic level "0" status.