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diff --git a/122/CH2/EX2.b.4/excB_2_4.sce b/122/CH2/EX2.b.4/excB_2_4.sce
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+// Exercise B-2-4
+// Plotting the response of different types of controllers
+// to unit step and unit ramp input.
+
+clear; clc; xdel(winsid());
+
+Kp = 4;    //proportional gain
+Ki1 = 2;   //integral gain
+Td = 0.8;  //differential time
+Ti = 2;    //integral time
+Ki2 = Kp / Ti;
+
+s = %s;
+Gi = syslin('c',Ki1/s);
+
+t = 0:0.05:3;
+ramp = t; 
+subplot(3,2,1);
+p1 = Kp * ones(1,length(t));
+p2 = Kp * t;
+plot2d(t ,p1 , style=2);
+plot2d(t ,p2 , style=3);
+xtitle('Proportional control','t','y');
+legend('step input','ramp input'); 
+xgrid(color('gray'));
+
+subplot(3,2,2);
+i1 =  csim("step",t,Gi);
+i2 =  csim(ramp,t,Gi); 
+plot2d(t ,i1, style=2);
+plot2d(t ,i2, style=3) ;
+xtitle('Integral control','t','y');
+xgrid(color('gray'));
+i1 = i1 * Ki2 / Ki1; //change of gain
+i2 = i2 * Ki2 / Ki1;
+
+ 
+subplot(3,2,3);
+plot2d(t ,p1 + i1, style=2);
+plot2d(t ,p2 + i2, style=3);
+xtitle('Proportional integral control','t','y');
+xgrid(color('gray'));
+ 
+subplot(3,2,4);
+pd1 = p1;
+pd2 = p2 + Kp*Td*ones(1,length(t)); //derivative term
+plot2d(t ,pd1, style=2);
+plot2d(t ,pd2, style=3);
+xtitle('Proportional plus derivative control','t','y');
+xgrid(color('gray'));
+ 
+subplot(3,2,5);
+plot2d(t ,pd1 + i1, style=2);
+plot2d(t ,pd2 + i2, style=3,leg='ramp input') ;
+xtitle('P.I.D. control','t','y');
+xgrid(color('gray'));
diff --git a/122/CH2/EX2.b.4/figB2_4.jpg b/122/CH2/EX2.b.4/figB2_4.jpg
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+++ b/122/CH2/EX2.b.4/figB2_4.jpg