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\large
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\centerline {\bf 4.2\_V2.0 TURN ON DPA A \& B AND DEA A (SCS version) } 
\vspace{0.25in}

\normalsize
\noindent{\it Last Revised: June 28,1999}\\
\noindent{\bf Filename: dpaab\_deaa\_scs} \\


\noindent {\bf BRIEF FUNCTIONAL DESCRIPTION:} \\
\normalsize
This is an ``atomic'' procedure which simply powers up the DPA sides A
and B and DEA side A.  It should be safe to execute under any
condition except a spacecraft power or thermal emergency.
This version should be implemented as an SCS which sends all 6
commands autonomously without a realtime verification.
This procedure powers up the DEA side A first so that the default
values can be loaded into the DEA when the DPA side A is powered up.

\vspace{0.25in}
\noindent The sequence of actions will be: 
\be
\item enable and turn on DEA power supply side A
\vspace{-0.10in}
\item enable and turn on DPA power supply side A
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\item enable and turn on DPA power supply side B
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\item verify that ACIS is in the correct state
\vspace{-0.10in}
\ee


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\normalsize
\noindent {\bf ASSUMED INSTRUMENT STATE:} \\
\normalsize
Assumes that the PSMC has power from the spacecraft. \\


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\normalsize
\noindent {\bf SPECIAL INITIAL CONDITIONS:} \\
\normalsize
%The environment must be clean enough to allow opening of the valve. \\
%Assumes that \axaf\/ ISIM RCTU is powered on and in telemetry format 6. \\

%\newpage 

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\normalsize
\noindent {\bf OPERATIONAL CONSTRAINTS/CAUTIONS:} \\
\normalsize



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\normalsize
\noindent {\bf REFERENCES:} \\
\normalsize


\normalsize
\noindent {\bf CHANGE HISTORY:} \\
\normalsize

{\bf V1.2}
\begin{itemize}
\item power up the DEA side A first, then the DPA A and DPA B
\item changed name of files from ``turnon\_dpaab\_deaa\_scs'' to ``dpaab\_deaa\_scs''
\end{itemize}

{\bf V1.3}
\begin{itemize}
\item changed HW TLM verifier in step 4.3 to ``1DEN1AVO'' from
``DEN1AVO''
\item changed criticality of ENABLE/DISABLE and ON/OFF HW TLM
verifiers to 2 and DPA +5~V and DEA +24~V to 1
\item changed TLM FMT required to 1or2
\item added step 4 to verify the expected state
\end{itemize}

{\bf V2.0}
\begin{itemize}
\item ACIS Team signed-off version
\item changed HW TLM verifier in step 4.4 to ``1DEN1BVO''
\item changed expected value of ``1STAT7ST'' to ``0'' in step 4.6
\end{itemize}

\newcommand{\tablecaptiontext}{Turn On DPA A \& B and DEA A (SCS version)}
\input{dpaab_deaa_scs.tab}

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