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|  MIL-N-81604C(AS)
Para 3.4.4.4
(cont)
Mode Switch On - The pole of the MODE switch shall
g.
provide a switch closure which is routed through
the ANCU to turn on the PSU. The pole of the switch
which is grounded external to the CIU, shall be
connected to this MODE Switch On discrete in all
switch positions except the OFF position. The
switch shall have make before break contacts with a
bounce no greater than 150 microseconds. The switch
contacts shall have a minimum current rating of
1 ampere resistive and 0.5 amperes inductive at
*
28 volts d-c. The PSU line receiver shall be com-
*
patible and require a maximum input current of a
*
100 milliamperes.
h.
Mode Switch Off - This discrete from the CIU
to the PSU shall be connected to the externally
grounded pole described in 3.4.4.4g to indicate
that the CIU MODE switch is in the OFF position.
This signal shall be used to initiate the PSU turn-off
sequence. The signal shall be routed through the
ANCU. The switch contact shall have a minimum
current rating of 1 ampere resistive and 0.5 amperes
*
inductive at 28 volts d-c. The PSU line receiver
*
shall be compatible and require a maximum input
current of 100 milliamperes.
*
*
i.
PSU Fail - Refer to 3.4.4.5b(4).
IMU Fail - Refer to 3.4.4.1a(5).
j.
*
k.
CAU Fail - Refer to 3.4.4.3c.
*
1.
ANCU Fail - This discrete output from the ANCU to
the CIU shall indicate that the ANCU malfunction flag
has been set. The flag shall be set at any time that
self-test detects an ANCU malfunction. When the flag
is in a reset (go) state, a short circuit shall be
supplied to the CIU. When the flag is in a set
(no-go) state, an open circuit shall cause the ANCU
*
malfunction lamp on the CIU to illuminate.
*
switch output shall have a minimum current rating
of 250 ma resistive and 100 ma inductive at 28 volts
*
d-c. The CIU line receiver shall be compatible with
*
these switch contacts and shall require a maximum
input current of 100 milliamperes.
*
76
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