Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Instrukcja Użytkownika Pobierz pdf (Strona 89)

Message Procedure Commands

Chapter 6

611

FROM_BCD Function

The FROM_BCD function converts its parameter from

binary–coded–decimal format to binary format. The resulting value is 32

bits long. For example, the FROM_BCD function in Figure 6.2 converts

the contents of decimal word 12 from binary coded decimal to a regular

decimal value of 27. From the above example (section titled TO_BCD

Function), the FROM_BCD function stores the following bit pattern in

user symbol COUNT:

0000 0000 0000 0000 0000 0000 0001 1011

As you can see from these examples, TO_BCD and FROM_BCD perform

opposite functions.

You can add your own explanatory comments to any command line in a

message procedure. To do this, enter a semicolon (;) after the command.

Then enter your comment after the semicolon. Figure 6.3 illustrates the

format for comments.

Figure 6.3

Format

for Comments

COUNT = 0 ; INITIALIZE COUNTER

Comment

Comment Delimiter

Command

10029–I

Anything that appears between a semicolon and the end of the command

line is considered to be a comment. Comments may be any length. The

end of the command line, and therefore the end of your comment, is

delimited by the carriage– return and line–feed pair of characters.

A comment can be the only thing on a line. Do not use comments on the

same line as label. Doing so will cause errors in the message procedure.

Comments

1 2 ... 84 85 86 87 88 89 90 91 92 93 94 ... 238 239

Brak uwag

Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Instrukcja Użytkownika Strona 89