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|  MIL-N-81604C(AS)
Para 3.4.4.1a
(cont)
IMU Ready - This discrete output from the IMU
(4)
to the ANCU shall go to the false (high, open,
or IMU power off) state to indicate that the
IMU is not ready to accept computer control or
the IMU is not level in the attitude reference
MODE. The true state of this discrete shall
be used to indicate that the platform is ready
to accept computer control or the platform is
level when in the attitude reference mode.
while in the attitude reference mode, the IMU
shall maintain analog control of the gyros even
after the IMU Ready discrete goes true. This
discrete shall go true, when indicating that
the computer should accept control, at 41 2
seconds from ambient temperatures above -10F.
This time may be extended linearly to 96 seconds
at -65F. The line driver in the IMU and the
line receiver in the ANCU shall be Type B
circuits.
IMU Fail - This discrete output from the IMU
(5)
to the ANCU shall go to the true (low, open,
or IMU power off) state to indicate that the
*
IMU malfunction flag has been set to the no-go
state. This occurs whenever the IMU hardware
BIT circuitry detects an IMU malfunction or
when the ANCU detects an IMU malfunction. The
signal shall be sent to the ANCU software and
also routed through the ANCU to the CIU to
illuminate the IMU malfunction indicator when
in the true state. When the IMU is in a go
state, the IMU fail discrete shall supply a
high output. The line driver in the IMU and
the line receivers in the CIU and ANCU shall
be Type C circuits.
ANCU Discrete Outputs (ANCU to IMU) - The ANCU shall
b.
provide four discrete outputs to the IMU. In addi- *
*
tion, two programmable spare Type B drivers in the
ANCU may be utilized if necessary.
37
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