Chapter 7 Flashcards
1
Q
on delay vs off delay
A
on delay: provides time delay when the relay coil is energized
off delay: provides time delay when the relay coil is de-energized
2
Q
retentive timer on
A
retains accumulated value when power is removed
3
Q
bits of a timer
A
- enable (true whenever timer instruction is true)
- timing timer: true when timer is timing
- done: makes when accumulated equals preset value
4
Q
off/on delay vs RTO
A
off/on reset once power is removed
5
Q
maximum preset value
A
32767
6
Q
addresses
A
can go from T4:0 to T4:99
7
Q
cascading timers
A
when want to increase time, cascade the timers because timers add
8
Q
reciprocating timers
A
timing functions where the output of one timer is used to reset the input of a second timer, each resetting the other
9
Q
annunciator flasher circuit
A
- three alarm conditions: temperature, pressure, travel
- starts with no lights on
- lights will flash when alarms go off
