ISPSoft User Manual

Chapter 9 Function Block Diagram
function block/an applied instruction.
• Graphical representation
• Example
Example 1: When M0 is turned from OFF to ON, M1 is ON. When M0 is turned form ON to OFF,
M1 is OFF.
Example 2: The mark F is inserted into an input pin of the AND block.
Example 3: The En pin of the first applied instruction is connected to the input node representing
M0, and therefore the mark P can be inserted into in the input node representing M0.
However, the mark P/F can not be inserted into the En pin of the second applied
instruction.
Example 4: The figure below is an incorrect example. The mark F can not be inserted into an
input node which does not represent a Boolean device or a symbol whose data type
is BOOL.
• Inserting the mark P/F
(1) Select a position into which the mark P/F will be inserted in the working area. Users are
allowed to insert the mark P/F into the positions marked with red frames in the figure below.
Although the operand assigned to the input pin of the function block FB0 is a Boolean
operand, the mark P/F can not be inserted into the input pin of FB0. Besides, P/F can not
be inserted into a position which does not have an output node, and a position which is not
connected to an object. For example, the mark P/F can not be inserted into the input node
in network 3.
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