Delta AH500 series Manual download pdf (Page 20)

AH500 Hardware Manual

 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 setting of passwords by means of 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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Delta AH500 series Manual Page 20