PLC Flashcards
What is a PLC sequencer block used for____?
A) initiate an event driven or time driven sequence of events
B) initiate a sequence in a counter function
C) initiate an event driven or time driven sequence of outputs
D) communicate with a peripheral device
an event driven or time driven sequence of outputs
Internal relays are programmed into a PLC as a ______ instruction
OTE
what numbering code is setup so that when you progress from one number to the next number only one bit changes
gray code
What is the IO address for terminal 17 if an output module is slot 4 of a PLC
O:4/17
Which of the following best describes the operation of output coil instruction in PLC porgramming
Both if any continuity path in the ladder rung is encountered the output coil will be on
if no continuity path in the ladder rung is encountered the output coil instruction will be off
The PLC _____ specification indicates how fast the controller can react to changes in the inputs
scan time
How many clock pulses are needed to shift a byte of data in to and out of an eight bit serial in serial out shift register
15 clock pulses
numbers assigned to hardware devices that software uses to send command to those devices are called?
A) I/O address
B) DMA Channels
C) IRQ
D) Memory Address
I/O address
How many 16 bit words are required to define the status of inputs I:3/0 thru I:3/15?
A) 16
B) 2
C) 1
D) 3
16
PLC uses what types of counters
A) up / down
B) analog / digital
C) delay/ reset
D) both B & C
up/ down
What are 3 basic computational instruction of a PLC?
CTU, TON, TOF
Not a real world input device in a PLC?
solenoid valve
Only way to tell whether an input / output element in a PLC program is a logical or physical instruction is to examine its?
A) address
B) symbol
C) rung position
D) status
address
One limitation branch circuit programming is that you can not program in______?
A) counters
B) vertical contacts
C) delay timers
D) horizontal contacts
vertical contacts
