block MultiSwitch "Set Boolean expression that is associated with the first active input signal"
input Boolean expr[nu] = fill(false, nu) "y = if u[i] then expr[i] else y_default (time varying)"
annotation (Dialog);
parameter Boolean use_pre_as_default = true "set true to hold last value as default (y_default = pre(y))"
annotation (
HideResult = true,
choices(checkBox = true));
parameter Boolean y_default = false "Default value of output y if all u[i] = false"
annotation (Dialog(enable = not use_pre_as_default));
parameter Integer nu(min = 0) = 0 "Number of input connections"
annotation (
Dialog(connectorSizing = true),
HideResult = true);
Modelica.Blocks.Interfaces.BooleanVectorInput u[nu] "Set y = expr[i], if u[i] = true"
annotation (Placement(transformation(extent = {
{-110, 30},
{-90, -30}})));
Modelica.Blocks.Interfaces.BooleanOutput y "Output depending on expression"
annotation (Placement(transformation(extent = {
{300, -10},
{320, 10}})));
protected
Integer firstActiveIndex;
initial equation
pre(y) = y_default;
equation
y = if firstActiveIndex == 0 then if use_pre_as_default then pre(y) else y_default else expr[firstActiveIndex];
firstActiveIndex = Modelica.Math.BooleanVectors.firstTrueIndex(u);
annotation (
defaultComponentName = "set1",
Icon(
coordinateSystem(
preserveAspectRatio = true,
extent = {
{-100, -100},
{300, 100}}),
graphics = {
Text(
visible = not use_pre_as_default,
extent = {
{-100, -60},
{300, -90}},
textString = "else: %y_default"),
Text(
visible = use_pre_as_default,
extent = {
{-100, -60},
{300, -90}},
textString = "else: pre(y)"),
Text(
extent = {
{-99, 99},
{300, 59}},
textString = "%name",
lineColor = {0, 0, 255}),
Rectangle(
extent = {
{-100, -51},
{300, 50}},
lineColor = {255, 127, 0},
lineThickness = 5,
fillColor = {210, 210, 210},
fillPattern = FillPattern.Solid,
borderPattern = BorderPattern.Raised),
Text(
extent = {
{-84, 16},
{273, -15}},
textString = "%expr"),
Ellipse(
extent = {
{275, 8},
{289, -6}},
lineColor = DynamicSelect({235, 235, 235}, if y then {0, 255, 0} else {235, 235, 235}),
fillColor = DynamicSelect({235, 235, 235}, if y then {0, 255, 0} else {235, 235, 235}),
fillPattern = FillPattern.Solid)}),
Documentation(info = "<html>\n<p>\nThe block has a vector of Boolean input signals u[nu] and a vector of\n(time varying) Boolean expressions expr[:]. The output signal y is\nset to expr[i], if i is the first element in the input vector u that is true.\nIf all input signals are false, y is set to parameter \"y_default\" or the\nprevious value of y is kept if parameter use_pre_as_default = <strong>true</strong>:\n</p>\n\n<blockquote><pre>\n // Conceptual equation (not valid Modelica)\n i = 'first element of u[:] that is true';\n y = <strong>if</strong> i==0 <strong>then</strong> (<strong>if</strong> use_pre_as_default <strong>then</strong> pre(y)\n <strong>else</strong> y_default)\n <strong>else</strong> expr[i];\n</pre></blockquote>\n\n<p>\nThe usage is demonstrated, e.g., in example\n<a href=\"modelica://Modelica.Blocks.Examples.BooleanNetwork1\">Modelica.Blocks.Examples.BooleanNetwork1</a>.\n</p>\n\n</html>"));
end MultiSwitch;