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103 <h1 class="whs1">About nodes</h1>
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105 <p class="whs2"><img src="../i_blue.jpg" x-maintain-ratio="TRUE" width="30px" height="30px" border="0" class="img_whs3">In general,
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106 in SUPERVISION component <span style="font-weight: bold;"><B>Node </B></span> is
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107 a graphical representation of a computation algorithm. The Data flow graph
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108 consists of several nodes of <span style="font-weight: bold;"><B>control</B></span>
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109 and <span style="font-weight: bold;"><B>computation</B></span> types. These nodes
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110 have input and output <span style="font-weight: bold;"><B>data ports</B></span>
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111 for data transferring and <span style="font-weight: bold;"><B>control ports</B></span>.
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112 All data ports of a node correspond to input or output parameters of the
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113 service executed on this node. Connecting of these ports by links means
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114 transferring of the data from output port to input port of a next node.
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115 So, only output and input ports of different nodes can be connected by
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116 one link. All input ports which have not connection to output ports are
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117 input of the Graph. Initial values of such ports can be defined as constant
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118 value or taken from the current study. All output ports which have no
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119 connection to input ports are output of the Graph. Values from these ports
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120 can be stored in the study.</p>
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122 <p class="whs2"> </p>
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124 <p class="whs2">In SUPERVISION module
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125 there are the following types of nodes: <span style="font-weight: bold;"><B>computation
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126 node</B></span>, <span style="font-weight: bold;"><B>loop node, switch node</B></span>
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128 style="font-weight: bold;"><B>GOTO node</B></span>.</p>
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