Delta AS Series Operation Manual page 28

A S S e r i e s O p e r a t i o n M a n u a l
 You can select a programming language according to your preference. Programming languages
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support one another so that programs written by different users are compatible.
(6) Strong function block
 Both standard IEC61131-3 function blocks and convenient functions blocks provided by Delta
Electronics, Inc. are supported. You can use function blocks for frequently used programs for greater
structure and convenience.
 The symbol for a function block in a ladder diagram is similar to an integrated circuit (IC) in a circuit
diagram. Because the ladder diagram is based on the traditional circuit diagram, the operation of a
function block is similar to the function of an integrated circuit. You only need to send the signal to the
corresponding input of the function block. You do not need to consider the processing procedure
inside the function block.
 A function block is a program element equipped with the operation function. It is similar to a
subroutine, and is a type of POU (Program Organization Unit). It cannot operate by itself, and must
be called through the main program POU. The function defined by the function block is executed
after being called with the related parameters. The final result can be sent to the device or variable in
the superior POU after the function block completes.
 You can set passwords in ISPSoft to provide function block security. The program inside a function
block cannot be read, and business patents cannot be compromised.
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