PLC 1

Question 1

Scans input conditions and executes user program to set output conditions

Answer 1

Processor

Question 2

Lowers and stabilizes voltage used for electronics in PLC components.

Answer 2

Power supply

Question 3

Printed circuit board with sockets that modules plug into

Answer 3

Backplane

Question 4

Made of metal or plastic, this is the frame for most PLC systems

Answer 4

Chassis

Question 5

Modules that are designed to connect the PLC to “real world” devices

Answer 5

I/O cards

Question 6

Underlying systems that provide basic functions and services

Answer 6

Communications cards

Question 7

Modules that connect the PLC to other systems and devices, such as variable speed drives and personal computers

Answer 7

Special purpose card

Question 8

What do input cards do?

Answer 8

Convert signals from field devices to a signal for the processor

Question 9

What are discrete modules used for?

Answer 9

Devices that have only one or two states

Question 10

T/F any I/O point can be traced to a bit in processor memory

Answer 10

True

Question 11

What designates the I/O type in an adress?

Answer 11

I: or O:

Question 12

What systems provide communication between field devices and the processor?

Answer 12

The I/O system

Question 13

What 6 advantages do PLC’s provide?

Answer 13

Increased reliability
More flexibility
Lower cost
Communications capability
Faster response time
Easier to troubleshoot

Question 14

What do output cards do?

Answer 14

They convert signals from the processor to signals for field devices

Question 15

T/F Analog signals operate through only one value 4-20mA

Answer 15

False

Question 16

T/F a programming terminal is required for the purpose if going online with the PLC to monitor I/O status

Answer 16

True

Question 17

What is the primary function of a counter?

Answer 17

To keep track of how many

Question 18

T/F it is possible to use a CTU and CTD instruction on the same address

Answer 18

False

Question 19

T/F an RTO instruction needs an RES instruction

Answer 19

True

Question 20

What program is used for allen bradleys PLC’s?

Answer 20

Rockwell’s RSLogix

Question 21

What program is used to communicate between a PC and a PLC?

Answer 21

RSLinx

Question 22

What is an example of an output?

Answer 22

A lamp

Question 23

What is an example of an input?

Answer 23

A pushbutton

Question 24

What is a channel configuration used for?

Answer 24

To set network addresses and connection speeds

Question 25

What information does the I/O configuration provide?

Answer 25

The type and number of I/O cards

Question 26

What should documentation include in a PLC system?

Answer 26

Device addresses, descriptions, and title pages

Question 27

What does a complete scan cycle of a standard PLC include?

Answer 27

Self check, read I/O, solve user logic, and write outputs

Question 28

What order does the PLC read logic in?

Answer 28

Top to bottom, left to right

Question 29

What does XIC stand for

Answer 29

Examine if closed

Question 30

What does an XIC instruction do?

Answer 30

Sets output to 1 if it examines a 1 at a set address

Question 31

What does XIO stand for?

Answer 31

Examine if open

Question 32

What does an XIO instruction do?

Answer 32

Sets output to 1 if it examines a 0 at a set address

Question 33

What is the format for an address?

Answer 33

(File type)(File number):(Word)/(Bit)

Question 34

What does OSR stand for?

Answer 34

One shot relay

Question 35

What does OTE stand for?

Answer 35

Output energize

Question 36

What does OTL stand for?

Answer 36

Output latch

Question 37

What does OTU stand for?

Answer 37

Output unlatch

Question 38

What does an OSR instruction do?

Answer 38

When the preceding instruction is true it sets its output bit to true for one cycle

Question 39

What does an OTE instruction do?

Answer 39

When preceding instruction is true, it sets the output bit to 1

Question 40

What does an OTL instruction do?

Answer 40

When preceding instrucion is true, it sets the output to 1 until it is unlatched

Question 41

What does an OTU instruction do?

Answer 41

When preceding instruction is true, it unlatches a bit, setting it to 0

Question 42

What does TON stand for?

Answer 42

Time on delay

Question 43

What does TOF stand for?

Answer 43

Time off Delay

Question 44

What does RTO stand for?

Answer 44

Retentive Time on Timer

Question 45

What does RTF stand for?

Answer 45

Retentive timer false

Question 46

What six values does each timer have?

Answer 46

Timer address, Timer base, preset value, accumulated value, enabled bit, and done bit