MIL-DTL-24784/19B (SH)
shall be used when necessary to list ship's cable and associated wire designations, plus all pertinent
terminal board, terminal, and pin and jack numbers entering and leaving subsystems and
equipment. An SFD, such as a data functional and control functional, which schematically portray
data-gathering paths and control paths through the system, will be largely redundant with the
content of equipment manual diagrams, but somewhat greater detail is expected in the individual
equipment diagrams. Figure numbers, titles, and sheet numbers are required for SFDs. The
tabulation sheets associated with each SFD shall be compiled as a table and appropriately located
to enable the best possible use of the SFD. Tabulation sheets may also be identified as sheets of
an SFD, bearing the same figure number and title of the SFD. In this case, tabulation sheets shall
be located immediately ahead of the associated SFD and shall be the first, second, in sequence,
sheet of the SFD.
3.6.10.1 Power distribution SFDs. Power distribution SFDs shall be provided for each power
system used to supply power to subsystems or equipment. These SFDs shall show ships power
from the generators, or other originating source, through the interconnecting switchboards and
weapon control switchboards to the subsystems and equipment. Distribution of each control or
reference power system shall be illustrated from source to the equipment and to subunits of the
equipment. Depict such signal flow as receive, transmit, RHI display, PPI display, bearing data,
antenna rotation, and elevation data. The diagrams shall show all circuit breakers, control relays,
transformers, meters, fuses, indicators and lamps. Interconnections between sheets or zones shall
be cross-referenced. Wiring tabulation sheets shall list initiating and receiving units, terminal
numbers, interconnecting cables, and wire numbers for each diagram. Junction box or connection
box numbers shall be listed as required (see figure 19-12).
3.6.10.2 Digital SFDs. Digital SFDs shall depict, by logic symbols and supplementary notations,
the details of signal flow and control existing in a system involving two-state devices. Logic
symbology on the SFDs will be in accordance with IEEE 991. Digital SFDs shall illustrate the
processing of variable signal inputs and resultant outputs and shall portray signal flow for major
output functions and logical functions such as units, modules, and subassemblies. Where multiple
output signals are time shared through groups of identical units, such as, gates, clamps, inverters,
and counters, one time-shared signal flow line shall be arbitrarily chosen to illustrate the signal
flow. Where identical digital units are grouped, only the one through which the arbitrarily chosen
main signal path goes shall be shown in detail. The depth of detail shown on digital functional
diagrams depends on the complexity of the equipment and shall be as determined by the
Government upon receipt of the initial submittal of samples.
3.6.10.3 Section 1 - System functional directory. A system functional directory shall be
developed and located to precede the SFDs (see figure 19-13). The directory shall be an
alphabetical tabulation of all system data and control functions. Each entry shall include the
following information as applicable for the function.
a. Name of function.
b. Fire control symbol derived from NAVSEA OP 1700 (if applicable).
c. The origin and termination of the function.
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