PLC Timers Flashcards
What is the maximum time that one timer may accumulate for?
2,147,483.647 Seconds OR 2,147,483,647 Milli Seconds
When the rung of the TON instruction is false, what is the value of ACC?
0
When does a TON begin timing?
When the rung is true
In order to turn an output on for the first 10 seconds of a TON rung becoming true and then off, which bit of a 10 second TON should be used to control that output?
Timer Timing Bit (TT)
The TON timer present value is zero when?
When it is programmed at 0
In order to turn an output on after a 10 second delay of a TON rung becoming true, which bit of a 10 second TON should be used
The Timer Done Bit (DN)
When the rung of a TOF timer is true, is the Timer Enable Bit (EN) high or low?
Timer Enable Bit (EN) is high
The TOF Done Bit (DN) is equivalent to what?
The timed contacts on a Time Delay On De-energization (TDOD)
The TOF timing bit is set when?
When the timer rung goes false
The TOF timer accumulated value is zero when?
When the rung is true
When does an RTO begin timing?
When the rung is true
When is the accumulated value of an RTO reset to zero?
It is reset back to zero when a reset instruction (RES) with the same timer address is energized
The accumulated value of an RTO will increase while its rung is true until what?
- It will continue to increase while the rung is true until the accumulated (ACC) value is equal to the preset (PRE) value of the RTO
- It will continue to increase until the rung goes false, but it will retain its accumulated value while the rung is false and then continue to increase once the rung goes true again
When the rung of an RTO instruction goes from true to false, how is the accumulated (ACC) value effected?
- The accumulated value will be latched at its current value
- RTO’s retain their accumulated value in the event that the rung goes false, and then they will continue to increase once the rung goes true again
Which area of the tag base would you find TON?
T4
