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|  MIL-N-81604C(AS)
Para 3.4.4.4
(cont)
CIU Flag Set - The true (high) state of this discrete
m.
shall be supplied from the ANCU to the CIU if the
self test detects a malfunction in the CIU. This
discrete, when in the true state for a minimum of
20 msec, shall cause the CIU flag to go to the set
(no-go) state if the CIU flag reset is not present.
The false (low, open, or ANCU power off) state shall
cause.no change in state of the malfunction flag.
The ANCU line driver and the CIU line receiver shall
be Type C circuits.
CIU Flag Reset - The true (low, open, or ANCU power
n.
off ) state of this discrete shall be supplied from
the ANCU to the CIU at any time that ANCU self-test
determines that the ANCU can no longer supply a
trustworthy CIU Flag Set signal. This discrete,
when in the true state for a minimum of 20 msec,
*
shall cause the CIU flag to go to the reset (go)
state if the flag had been set by the CIU Flag Set
In addition, this discrete shall continue
signal.
to prevent the CIU Flag Set signal from setting the
CIU flag as long as reset is present. The false
(high) state shall enable control of the flag from
*
CIU Flag Set, but shall cause no change in state of
the flag directly. The line driver in the ANCU and
the line receiver in the CIU shall be Type C circuits.
*
3.4.4.5 PSU Interface - Figure 16 presents the distribution of
power in the system.
*
Power - The PSU shall supply 28 volts d-c and
a.
*
+32 volts d-c to the ANCU, IMU, and CAU up to the
amount specified in 3.5.3. In addition, 60 ma
*
maximum of +5 volts d-c. shall be provided to the
*
CIU in the event of a PSU malfunction. This +5 volt
*
auxiliary power shall be used in the CIU to illumi-
*
nate the PSU malfunction indicator. The +28 volts d-c
*
shall have a rise time no longer than 10 milliseconds.
Discretes
b.
*
(1) Power Status - For overvoltage of the 28 volt
*
or undervoltages of the 28 volt or +32 volt d-c
supplies, this discrete shall go low within one
microsecond after initiation. High voltages of
77
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