ETL 1110-2-553
30 May 97
control stations and is supplemented by CCTV com-
point. These control points should be located on each
munication devices at strategic locations. Provision
lock wall adjacent to the lock gates. Use of these
may be included for future upgrade to centralized
control points should be very infrequent, usually
control.
during maintenance, repair, or emergency operation.
e. Control points. Additional locations for lock
f. Aesthetic treatment. The architectural design
operations can be provided as electronic control
of the permanent features (central control house and
points. These points should be either a fixed I/O
operations building, or local control stations) should
panel in a watertight box or a portable I/O panel that
be consistent with the form and function of the facil-
can be plugged into a fixed outlet at the operating
ity. However, cost efficiency should be of primary
equipment locations. A portable notebook-size per-
concern. In no case should additional structures be
sonal computer, either stand-alone or in communica-
provided only to achieve architectural balance or
tion with the PLC, can be used as a plug-in control
symmetry.
A-8
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