PLC Counters Flashcards
1
Q
Which software command is used to set the accumulated value in a counter to zero?
A
The Reset command (RES)
2
Q
What is a CTD in a PLC program used for?
A
- CTD is used to count the false to true rung transitions and then decrease the accumulated value
3
Q
What is the Mnemonic for a high speed counter?
A
HSC
4
Q
What are counters used within a PLC similiar to?
A
They are similiar to the operations of mechanical counters
5
Q
What do PLC Counters count the number of?`
A
They count the number of false to true rung transitions
6
Q
What is the mnemonic for an UP Counter?
A
CTU
7
Q
True or False, PLC counters are used to activate or deactivate a device after a pre-determined count.
A
True
8
Q
What are the status bits for a CTD instruction?
A
- CD
- DN
- UN
9
Q
Which address is used for a counter?
A
C5
10
Q
When will the done bit (DN) of a counter go true?
A
When the accumulated value equals the preset value
ACC=PRE
11
Q
A
