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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.
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 $$0.020A * \ohms{220} = 4.4V \;.$$
%
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}.
%
The hardware to software interface for the {\ft} example is handled
by the 'C' function $read\_ADC()$.
~\cite{sfmeaauto}.
by the 'C' function $read\_ADC()$
(see code sample in figure~\ref{fig:code_read_ADC}).
%
% An FMEA of the `software~medium' is given in table~\ref{tbl:sfmeaup}.
\paragraph{Timing and Synchronisation.}