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WorksheetsPLC Instructions Practice
Total questions: 15
Worksheet time: 30mins
What is the SLC 500 normally closed instruction called?
XIC or Examine If Closed
XIO or Examine If Open
PLC or Programmable Logic Controller
NOP or No Operation
What is the purpose of the instruction labeled "I:1" in the diagram?
To control the output instruction labeled "O:2".
To provide power to the circuit.
To act as a timer for the circuit.
To measure voltage in the circuit.
When the input device's physical condition is ON, and the input status table bit is 1, how does the processor evaluate the instruction?
True
False
Undefined
Error
What does the SLC 500 output instruction refer to as?
Output enable or OTE instruction
Input enable or ITE instruction
Parallel enable or PTE instruction
Series enable or STE instruction
How must multiple outputs be programmed in an SLC 500 program?
In series
In parallel
In sequence
In random order
What does each instruction on a ladder rung require to associate with the field device and data table it examines?
A unique identifier
An address
A memory location
A data type
What is the typical OTE address format?
I:1/0
O:2/1
X:3/2
A:4/3
What characteristic is shared by both OTL and OTU instructions?
They are non-retentive instructions.
They are retentive instructions.
They are used for memory initialization.
They are used for processor reset.
What is the primary purpose of latching in ladder logic?
To maintain the state of an output even after the input is deactivated.
To reset the entire circuit to its initial state.
To increase the speed of the circuit.
To reduce the power consumption of the circuit.
What happens to the output when the "L" instruction is activated in the ladder logic diagram?
The output is turned off.
The output is latched and remains on.
The output is reset to its initial state.
The output is temporarily activated.
What is the purpose of programming a latching instruction before an unlatch instruction in a control system?
To ensure the output remains active until explicitly turned off.
To prevent the system from starting.
To reduce the power consumption of the system.
To increase the speed of the system.
Which input module is referenced in the ladder diagram for the latching and unlatching instructions?
1746-IA8.
1746-OB16.
1746-IB8.
1746-OA16.
What is the purpose of the colon (:) in bit file addressing?
It identifies the element number.
It separates the file type and file number.
It identifies this as file 3.
It indicates a bit instruction.
In a PLC project, what is true about the number of program files?
There can only be one program file
There may be more than one program file
There must be exactly two program files
There cannot be any program files
Which data file is represented by the abbreviation "T4"?
Timer
Counter
Control
Status
