Question 1

Before a program can be developed for input into a PLC, it is necessary to assign which devices connect to the input and output terminals.

Accepted Answer

This is true. Assigning which devices connect to the input and output terminals is a crucial step in developing a program for a PLC. This helps to ensure that the program functions correctly and communicates with the appropriate devices.

Question 2

Generally, coils cannot be connected in series in PLCs.

Accepted Answer

Coils are typically outputs of a PLC and cannot be connected in series because doing so may cause a short circuit.

Question 3

Programmable logic controllers are all programmed in basically the same way.

Accepted Answer

Programmable Logic Controllers (PLCs) can be programmed using various languages and standards, such as ladder logic, structured text, function block diagrams, and sequential function charts, among others. The specific programming methods can vary significantly between different PLC models and manufacturers.

Question 4

Most PLCs contain a timer that runs continually when the PLC is in the ____.&#10;A) DEBUG mode&#10;B) PROGRAM mode&#10;C) READ mode&#10;D) RUN mode

Accepted Answer

When the PLC is in RUN mode, the timer will run continually as it performs its programmed functions. In DEBUG mode, the timer may be paused or manually controlled by the programmer for testing purposes. PROGRAM mode is used for editing or creating new programs and does not affect the timer's operation. READ mode is typically only used for retrieving information from the PLC, and does not allow for any programming or control functions.

Question 5

Each line of logic in a PLC program must end with a ____.&#10;A) pushbutton&#10;B) coil&#10;C) line number&#10;D) contact

Accepted Answer

Each line of logic in a PLC program must end with a coil. A coil represents the output of the logic and is what will be energized or de-energized based on the inputs to the program. Pushbuttons, line numbers, and contacts are all inputs to the program and do not represent the output of the logic.

Question 6

Internal relays are programmed into the circuit logic by inserting a coil symbol in the program and assigning it a number between ____.&#10;A) 1 and 16&#10;B) 17 and 32&#10;C) 33 and 103&#10;D) 200 and 264

Accepted Answer

Internal relays are typically assigned numbers within a specific range to differentiate them from other types of devices or signals in a programmable logic controller (PLC) system. The range of 33 to 103 is commonly used for this purpose, allowing for a significant number of internal relays to be programmed into the circuit logic.

Question 7

Small programming terminals may require that the program be entered in a language called ____.&#10;A) Basic&#10;B) C&#10;C) Boolean&#10;D) Assembly

Accepted Answer

The answer of Small programming terminals may require that the...

Question 8

The manner in which a program is entered into the memory of the PLC is generally the same for all types of programming terminals.

Accepted Answer

Different types of programming terminals and software can have varying methods for entering, compiling, and transferring a program into the memory of a Programmable Logic Controller (PLC). These methods can depend on the manufacturer, the model of the PLC, and the programming environment used.

Question 9

Internal relays do not physically exist, but are only part of the program.

Accepted Answer

Internal relays are virtual or software-based relays that are incorporated into the programming of a device or system. They do not have a physical existence like traditional electromagnetic relays.

Question 10

In order to program a contact normally closed instead of normally open, the ____ statement is used.&#10;A) closed&#10;B) nopen&#10;C) not&#10;D) notopen

Accepted Answer

The "not" statement, also represented by the exclamation mark (!), can be used to invert the logic of a contact in a ladder logic program. For example, "!Open" would be equivalent to "Closed" and "!Closed" would be equivalent to "Open".

Deck 59: Programming a PC