 |
|||
|
|
|||
| ||||||||||
|
|  MIL-D-81347C(AS)
Status Logic Subunit
3.5.1.4.6
Factional Description - The Status Logic
subunit will transmit
3.5.1.4.6.1
status information from the Navigation Sensors, Sonobuoy Receiver, Submarine
Anomaly Detector and
Camera System to the computer. The Status Logic Subunit will receive status
information from the
computer for the Navigation System. Figure 23 is a functional flow diagram of
the Status Logic Subunit.
General Description - The Status Logic Subunit shall monitor
3.5.1.4.6.2
status information from the following equipments:
(1) Navigation System
(2) Submarine Anomaly Detector (SAD)
(3) Sonobuoy Receiver
(4) Camera
The Status Logic Subunit shall transmit the status information to
the computer whenever there is a change in the status information or when requested by the computer
program. The Status Logic Subunit shall provide for expanding the monitoring to status information
from other equipments.
The Status Logic Subunit shall also provide decoding and storage
for status information from the computer (via the DOM) to the Navigation system.
3.5.1.4.6.3
Operating Requirements - Refer to the functional flow diagram
(Figure 23).
Status Information to Computer via Digital Input Multiplexer
3.5.1.4.6;3.1
The Status Logic Subunit shall utilize two DIM channels to transmit the status information to the
computer.
The Status Logic Subunit shall be capable of receiving one SAD,
twenty-one Navigation System (general) Status lines, one Camera System, ten Sonobuoy Receivers,
two SUS system Status lines, one Drop Hold Status Line, one computer Track Status line and two
Spare Status lines. This status data shall be transmitted to the computer over one of the two DIM
channels assigned to the Logic Subunit. Since the DIM may transmit a maximum of 12 data bits to the
computer, the status information shall be transmitted as six distinct data words to the computer via the
DIM channel. Bit position coding shall be utilized in forming these data words; i.e. , the voltage level
on each status line shall be represented by the logic level of a bit in one of the input data words. The
status data shall be organized into the data words as defined in the word formats.
In addition to transmitting the status words to the computer, the
Status Logic Subunit shall store each of the six words to serve as the criterion for detecting a change
in status information. The Status Logic Subunit shall continue to compare each of the stored data words
(representing the status information on which the computer program is operating) with the information
on the status lines to detect a change in status. Whenever a status change is detected, the new data
word(s) shall be transmitted to the computer and stored in the Status Logic Subunit.
The status data from the Submarine Anomaly Detector (SAD) shall
be transmitted to the computer utilizing the second DIM channel assigned to the Status Logic Subunit.
The Status Logic Subunit shall receive one SAD Status line. The status data from the system shall be
transmitted as a single input word to the computer. In addition to transmitting the status word to the
computer, the Status Logic Subunit shall store the word to serve as the criterion for detecting a change
in status. The Status Logic Subunit shall continually compare the stored status word with the informa-
tion on the status lines to detect a change in status. Whenever a status change is detected, the new data
word shall be transmitted to the computer and stored in the Status Logic Subunit.
57
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals