Delta AH500 series Hardware Manual page 10

Ch ap te r 1 Prod uc t In tr od uc tion
The programming languages which are supported are instruction lists (IL), structured texts
(ST), ladder diagrams (LD), sequential function charts (SFC), and function block diagrams
(FBD).
Users can select a programming language according to their preference and the
convenience. The programming languages support one another so that the programs written
by different users are related.
(6) Strong function block
Not only the standard IEC61131-3 function blocks are supported, but also the convenient
function blocks provided by Delta Electronics, Inc. are supported. Users can write the
program frequently executed in a function block so that the program becomes more
structured and can be executed more conveniently.
The symbol for a function block in a ladder diagram is like an Integrated circuit (IC) in a circuit
diagram. Owing to the fact that the ladder diagram is based on the traditional circuit diagram,
the operation of a function block is quite similar to the function of an integrated circuit. Users
only need to send the signal to the corresponding input of the function block, and they can
receive the signal or state which is required. During the whole process, users 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 can not operate by itself,
and has to be called through the program POU. After the related parameters are transmitted,
the function defined by a function block is executed. Besides, the final operation result can be
sent to the device or variable used in the superior POU after the execution of the function
block is complete.
The encryption function supported by ISPSoft provides the secrecy of function blocks for
special businesses. The program inside a function block can not be learned, and the patent
of a business will not be infringed.
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