Xjyuk

I need to draw a simple animated flow chart that describes the flow from each node to node.

In the picture timeframe, denotes how the flow of the animation.

This just spells out the comment. If you have some sort of a flow diagram, one can add this flowing frame there. One may want to play with the parameters to make it more fancy/appealing, but this illustrates how this could work.

documentclassbeamer
usepackagetikz
begindocument
newcountww
beginframe[t]
frametitleAn animated dash pattern
animate<2-49>
animatevalue<1-50>ww150
begintikzpicture
 pgfmathsetmacromydashww/25
 draw[dash pattern=on 0.001pt off mydash pt on 2pt] (0,0) rectangle (4,3);
endtikzpicture 
endframe
enddocument

Of course, you can also animate the dash phase

documentclassbeamer
usepackagetikz
usetikzlibrarychains,fit,positioning,shapes.geometric
begindocument
newcountww
beginframe[t]
frametitleAn animated dash pattern
animate<2-19> % <-increase 19 to make the animation last longer
animatevalue<1-20>ww110 % <- 210 is 19+1, so increase
transduration<1-20>0.4% <- 20 is 19+1, so increase; controls the speed
begintikzpicture
 beginscope[local bounding box=N,nodes=draw,>=stealth]
 beginscope[start chain=going below,nodes=on chain,join,draw,
 every join/.style=->,node distance=4mm]
 node[ellipse,alias=N0] Start;
 node[alias=N1] Wurzelbrumpf;
 node[alias=OCM] OCM;
 node[alias=O2] O2;
 node[alias=N3] Output;
 node[alias=N4] Stop;
 endscope
 node[left=of O2] (O1) O1;
 node[right=of O2] (O3) O3;
 draw[->] (OCM) -- (O1);
 draw[->] (OCM) -- (O3);
 pgfmathsetmacromydashphaseww/5 
 node[fit=(OCM) (O1) (O3),inner sep=1ex,
 dash=on 2.0pt off 2.0pt phase mydashphase pt](N2);
 endscope
 path foreach X in 0,...,4
 (NX-;
endtikzpicture 
endframe
enddocument

The speed here is controlled by the conversion to gif, in your beamer animation you need to go to full screen mode, use acroread and you can set the transduration to control the speed.