Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: “We had a CASE conditional with an IF statement inside it .”

A block of code is set as follows:

PROGRAM PLC_PRG
VAR
currentHopperWeight    : REAL := 250;
bag1Weight             : REAL;
bag2Weight             : REAL;
END_VAR

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

PROGRAM PLC_PRG
VAR
    password    : STRING(255) := 'password';
    length    : UINT;
    acceptPass : bool;
END_VAR

Bold: Indicates a new term, an important word, or words that you see onscreen. For instance: "Air gapped systems are simply systems that are not connected to the internet.”

Tips or important notes

Appear like this.