Deck 18: Function Block Programming

Question 1

In an assignment statement, the tag must be a BOOL, SINT, INT, LONG, or REAL.

Answer 1

False

Question 2

You terminate statements in structured text with the ____________________ character.

Answer 2

semi-colon,;

Question 3

Explain the major concern with respect to loop constructs and the watchdog timer.

Answer 3

The controller does not execute any other statements in the routine until it completes the loop. This could lead to a processor fault if the loop time is greater than the watchdog timer for the task.

Question 4

Explain structured text programming.

Question 5

Structured text can contain the following components; assignments, expressions, instructions, ____________________, and comments.

Question 6

The characters used to indicate an assignment statement are ":=".

Question 7

Function Block Diagram (FBD) programming is a method of programming that uses function blocks to make decisions or perform calculations.

Question 8

Explain the order of execution for operators.

Question 9

An expression can be a tag name, equation, or literal.

Question 10

When writing complex expressions, use ____________________ to group expressions within expressions.

Question 11

A(n) ____________________ is a standalone statement that performs a given task such as copying the contents of one array into another array or jumping to another routine.

Question 12

Explain a function block.

Question 13

Because structured text programming language is easy to monitor and troubleshoot, it should be used often by the electrician/technician.

Question 14

Explain the purpose of constructs.

Question 15

Allen-Bradley's Logix5000 controllers have over ____________________ different function blocks available to perform various tasks.