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IET > PLC 1 > Flashcards

PLC 1 Flashcards

1
Q

Scans input conditions and executes user program to set output conditions

A

Processor

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2
Q

Lowers and stabilizes voltage used for electronics in PLC components.

A

Power supply

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3
Q

Printed circuit board with sockets that modules plug into

A

Backplane

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4
Q

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

A

Chassis

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5
Q

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

A

I/O cards

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6
Q

Underlying systems that provide basic functions and services

A

Communications cards

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7
Q

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

A

Special purpose card

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8
Q

What do input cards do?

A

Convert signals from field devices to a signal for the processor

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9
Q

What are discrete modules used for?

A

Devices that have only one or two states

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10
Q

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

A

True

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11
Q

What designates the I/O type in an adress?

A

I: or O:

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12
Q

What systems provide communication between field devices and the processor?

A

The I/O system

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13
Q

What 6 advantages do PLC’s provide?

A 
Increased reliability
More flexibility
Lower cost
Communications capability
Faster response time
Easier to troubleshoot
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14
Q

What do output cards do?

A

They convert signals from the processor to signals for field devices

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15
Q

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

A

False

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16
Q

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

A

True

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17
Q

What is the primary function of a counter?

A

To keep track of how many

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18
Q

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

A

False

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19
Q

T/F an RTO instruction needs an RES instruction

A

True

20
Q

What program is used for allen bradleys PLC’s?

A

Rockwell’s RSLogix

21
Q

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

A

RSLinx

22
Q

What is an example of an output?

A

A lamp

23
Q

What is an example of an input?

A

A pushbutton

24
Q

What is a channel configuration used for?

A

To set network addresses and connection speeds

25
Q

What information does the I/O configuration provide?

A

The type and number of I/O cards

26
Q

What should documentation include in a PLC system?

A

Device addresses, descriptions, and title pages

27
Q

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

A

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

28
Q

What order does the PLC read logic in?

A

Top to bottom, left to right

29
Q

What does XIC stand for

A

Examine if closed

30
Q

What does an XIC instruction do?

A

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

31
Q

What does XIO stand for?

A

Examine if open

32
Q

What does an XIO instruction do?

A

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

33
Q

What is the format for an address?

A

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

34
Q

What does OSR stand for?

A

One shot relay

35
Q

What does OTE stand for?

A

Output energize

36
Q

What does OTL stand for?

A

Output latch

37
Q

What does OTU stand for?

A

Output unlatch

38
Q

What does an OSR instruction do?

A

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

39
Q

What does an OTE instruction do?

A

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

40
Q

What does an OTL instruction do?

A

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

41
Q

What does an OTU instruction do?

A

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

42
Q

What does TON stand for?

A

Time on delay

43
Q

What does TOF stand for?

A

Time off Delay

44
Q

What does RTO stand for?

A

Retentive Time on Timer

45
Q

What does RTF stand for?

A

Retentive timer false

46
Q

What six values does each timer have?

A

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

IET (7 decks)

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