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Robin P. Clark 2012-07-31 08:45:29 +01:00
parent 3705057f9b
commit 84e9f1ae62
1 changed files with 3 additions and 3 deletions
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6
papers/fmea_software_hardware/software_fmea.tex
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@ -360,7 +360,7 @@ Let us assume the {\ft} detection is via a \ohms{220} resistor, and that we read
from an ADC into the software. from an ADC into the software.
Let us define any value outside the 4mA to 20mA range as an error condition. Let us define any value outside the 4mA to 20mA range as an error condition.
% %
As a voltage, we use ohms law~\cite{aoe} to determine the voltage ranges: $V=IR$, $0.004A * \ohms{220} = 0.88V$ As a voltage, we use ohms law~\cite{aoe} to determine the voltage ranges: $V=IR$, $$0.004A * \ohms{220} = 0.88V $$
and $$0.020A * \ohms{220} = 4.4V \;.$$ and $$0.020A * \ohms{220} = 4.4V \;.$$
% %
Our acceptable voltage range is therefore Our acceptable voltage range is therefore
@ -660,8 +660,8 @@ and these are described in~\cite{sfmeainterface}.
%An interface FMEA is performed in table~\ref{hwswinterface}. %An interface FMEA is performed in table~\ref{hwswinterface}.
% %
The hardware to software interface for the {\ft} example is handled The hardware to software interface for the {\ft} example is handled
by the 'C' function $read\_ADC()$. by the 'C' function $read\_ADC()$
~\cite{sfmeaauto}. (see code sample in figure~\ref{fig:code_read_ADC}).
% %
% An FMEA of the `software~medium' is given in table~\ref{tbl:sfmeaup}. % An FMEA of the `software~medium' is given in table~\ref{tbl:sfmeaup}.
\paragraph{Timing and Synchronisation.} \paragraph{Timing and Synchronisation.}