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Page Title:
Discrete Signal Interface Requirements |
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|  MIL-S-70442 (AR)
APPENDIX A
DISCRETE SIGNAL INTERFACE REQUIREMENTS
IDENT NUMBER 20
FCC GOOD
NOMENCLATURE
28 VDC
TYPE
SINGLE UNSHIELDED
CONDUCTOR TYPE AND GAUGE
FIRE CONTROL COMPUTER
ORIGIN
SEE REMARKS
DESTINATION
SEE REMARKS
DESTINATION IMPEDANCE
FCC, RELAY
SOURCE
SOURCE IMPEDANCE
N/A
MAX CURRENT
0.25
AMPERE
TOTAL
MIL-STD-704
MAX
VOLTAGE
+28 VDC (FCC GOOD)
TRUE
STATE
VOLTAGE
OPEN CIRCUIT (FCC FAIL)
FALSE
STATE
VOLTAGE
DESTINATIONS AND DESTINATION IMPEDANCES ARE:
REMARKS
IFCU, RELAY COIL, 186 OHMS OR GREATER, WITH SURFACE DEVICE TO
1.
AVOID TURN-OFF TRANSIENTS.
2.
PILOT'S CAUTION PANEL, RELAY COIL, 550 OHMS OR GREATER, WITH
SUITABLE DEVICE TO AVOID TURN-OFF TRANSIENTS.
3.
HUDS, > 6.6
K OHMS.
4.
ROCKET MANAGEMENT SUBSYSTEM, > 2K OHMS.
48
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