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MECH1340ReadingLab6PLCCounterInstructions

True/False
Indicate whether the statement is true or false.
 

 1. 

After the count value reaches the preset value stored in a counter memory location, the counter turns off its output.
 

 2. 

Counters can control both external output and input instructions, just like timers.
 

 3. 

A count up instruction is the most common type of counter instruction.
 

 4. 

A CTU timer cannot be reset.
 

 5. 

A CTD counter has a Load input.
 

 6. 

The CTUD counter instruction combines a CTU and CTD instruction.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 7. 

A _________ counter is used to control a process that must be kept withing high and low limits.
a.
CTU
c.
CTUD
b.
CTD
d.
Retentive
 

 8. 

All counter instructions use a ________ format, which uses multiple inputs and outputs.
a.
coil
c.
midichlorian
b.
reset
d.
block
 

 9. 

The Counter Name is the _________ address assigned to the instruction.
a.
stargate
c.
symbolic
b.
input
d.
output
 

 10. 

The CTD instruction loads the ____ into its CV when its Load input turns true.
a.
R2
c.
PV
b.
D2
d.
CD
 

Completion
Complete each statement.
 

 11. 

A counter operates very similarly to a retentive on-delay timer instruction except that it counts up or down by one each time its ________ turns true.
 

 

 12. 

The instruction stores the current value in a location called the _______ value.
 

 

 13. 

Counter instructions control input instructions by assigning a counter _______ bit address to the input instruction.
 

 

 14. 

Counter instructions are used to control the number of machine cycles performed, keep track of data such as parts produced or rejects, and trigger an _________ after a certain number of other events have occurred.
 

 

 15. 

A ____ instruction can be used to tell the operator the number of counts that have taken place.
 

 

 16. 

The count up input (CV) is used to __________ the count value (CV) of a CTU counter instruction.
 

 

 17. 

The count value, CV represents the number of times the CU input has ____________ from false to true.
 

 

 18. 

The _________ input is used to reset a CTU instruction.
 

 

Matching
 
 
a.
CTUD
c.
CTU
b.
CTD
 

 19. 

Counts up from 0 to a preset value before turning on its output.
 

 20. 

Counts the difference between the up count and down count values.
 

 21. 

Counts down from a preset value to 0 before turning on its output.
 
 
Identify the correct type of counter block
a.
CTD counter
c.
CTUD
b.
CTU counter
 

 22. 

ma022-1.jpg
 

 23. 

ma023-1.jpg
 

 24. 

ma024-1.jpg
 



 
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