Timers/Counters
HMI
Math Instructions
Functions/Function Blocks
SCL
100
Which parameter holds the output of the timer?
Q
100
What does HMI stand For?
Human Machine Interface
100
True or false: Math Instructions are only able to be done with REAL data types
False
100
What are the advantages of using functions and/or function blocks?
Keeps code more organized, breaks up big problems into smaller ones and keeps code DRY (Don't Repeat Yourself)
100
What does SCL stand for?
Structured Control Language
200
What bits are available for a down counter?
LD, CV, PV, Q and CD
200
List at least two button event functions in the TIA Portal HMI Screen Editor?
Click
Press
Release
200
What is the purpose of a Modulo (MOD) instruction?
A Modulo (MOD) instruction returns the remainder of a division.
200
What is a common application for function blocks?
Motor, Tanks, Conveyors, Lights
(anything where the same control and data flow applies to more than one set of inputs and outputs)
200
Which symbol is used to end instruction in SCL?
;
300
Which timer does this timing diagram represent?
TON
300
What does SCADA stand for?
Supervisory Control and Data Acquisition
300
What would be the output of this LIMIT instruction?
0
300
How do you create a function in TIA portal?
Select add new block, select function, name the function and then hit OK.
300
What does the := symbol represent in SCL?
Assignment operator
400
Which timer does this timing diagram represent?
TOF
400
What are some inputs on an HMI?
Button, Switch, I/O Field (Numeric Input)
400
This instruction with 5 as its MIN and 10 as its MAX would function the same as the ladder logic shown:
IN RANGE
400
How are function blocks different than functions?
Functions do not have a data block that goes with them. Both can be called multiple times throughout an OB with different inputs and outputs, but functions cannot retain data between PLC scans.
400
What are some reasons to use comments in SCL?
Prevent a line of code from running (for testing purposes) without deleting it forever and leave a note to yourself or other programmers
500
Which timer does this timing diagram represent?
TONR
500
I want to change a bit from 0 to 1 on one button click and then 1 to 0 on the next button click. Which button event function should I use in the TIA Portal HMI Screen Editor?
InvertBit
500
Given the inputs to NORM_X shown below, calculate the output.
0.875 to 0.895 (any answer in this range will work)
500
What is the difference between static and temporary variables?
Static variables exist only in function blocks and retain their value in between scans. Temp variables are found in functions and function blocks and do not retain their value in between scans.
500
"At Entry 1" is true and then false. If the code snippet below is the only code, what will be the value of "Conveyor 1" ?
IF "At entry 1" THEN
"Conveyor 1" := 1;
END_IF;
1