Gaia
GAIA.ASU.SP.ESM.00007
Issue 2.00
Page 35 of 79
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GAIA.ASU.SP.ESM.00007 (Avionics SCOE Req Iss 2).doc
3.6.5.2 CPS LV Status Simulation
AVI-346/CREATED/T
LV Status Simulation function shall be provided by relay simulation (18x) of each LV STATUS micro-
switch.
AVI-347/CREATED/T
LV Status Simulation shall conform to the following specifications: [AD06] Table 3.5-28 (Relay Status
Acquisition Source Specification).
AVI-348/CREATED/T
In open-loop test modes LV STATUS (OPEN/CLOSE) relay shall be set to the STATE value of the
corresponding LV command pulse acquisition (see AVI-382).
AVI-1609/CREATED/T
In open-loop test modes, it shall be possible to overwrite the LV STATUS from the local MMI or from
the CCS (Test Procedure/Command Line).
Note: This allows error injection into the EIU - Latch Valve Status not reflecting the commanded
operation.
AVI-1608/CREATED/T
In closed-loop test mode, LV STATUS shall be defined by the RTS.
3.6.5.3 CPS FCV Command Pulse Acquisition
AVI-359/EIU-713/T
The FCV Command Pulse Acquisition interface shall be provided by fixed loads (16x) simulating each
of the FCV coils.
AVI-360/EIU-715/T
The FCV Command Acquisition interface shall conform to the following specifications: [AD06] Table
3.5-36 (Flow Control Valve Interface Specification - Receiver Circuit Specification).
AVI-378/CREATED/T
FCV Command Pulse Acquisition shall provide measurements of the integrated ON time for each
FCV, the individual command pulse widths and an event count per FCV, as detailed below:
EVENT COUNT limit 65536
ON time resolution 5 %
Pulse WIDTH resolution
100.0 µs - for pulse widths 5ms to continuous
Table 3.6-3: CPS - FCV Command Pulse Measurement Specification
AVI-372/CREATED/T
Once an FCV Command has triggered, ON time measurements shall be integrated every 15.625 ms
(equivalent to the RTS Simulation Cycle rate of 1/64 of the Major Frame rate) and calculated as
percentage (ON) over the integration period. TBC
Note: Although the CPS Model in the RTS executes at 64Hz in real-time, thrust vectors output to the
Dynamics Model need to consider thruster pulses to an accuracy of <1ms.
AVI-1887/CREATED/T
Measurement of LV Command pulses shall be triggered asynchronously by detection of an incoming
pulse with the following specifications:
• Pulse Width > 1ms
• Pulse Amplitude > 10.0V
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