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SIEMENS PLC TEST 1 Questions with Detailed Verified
Answers
What is a programmable logic controller(PLC)? Ans: ✓ ✓ ✓ An industrial grade computer that is
capable of being programmed to perform control functions.
Which of the following is not an advantage PLC offers over conventional relay-based control
systems? Ans: ✓ ✓ ✓ Ability to Control High Voltage/Current Directly
A(n) _____ architecture design allows the system to be easily connected to devices and programs
from other manufacturers. A(n) _____ architecture makes connecting devices from different
manufacturers more challenging Ans: ✓ ✓ ✓ open | proprietary
Inputs and Outputs (I/O) are integrated into the PLC in either _____. Ans: ✓ ✓ ✓ fixed or modular
configurations
When I/O is modular, it slots into the _____. It connects to the backplane allowing the CPU to
communicate with the modules. Ans: ✓ ✓ ✓ Rack or chassis
Which of the following is a function of the Processor Module or CPU? Ans: ✓ ✓ ✓ Executes the
stored user program from memory.
Sends appropriate output commands to control devices.
Accepts input data from sensing devices.
Which of the following describes the function of I/O modules? Ans: ✓ ✓ ✓ Forms the interface
between the CPU and the field devices
Which of the following is not powered by the Power Supply? Ans: ✓ ✓ ✓ Field device
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What are the two most common types of PLC programming devices? Ans: ✓ ✓ ✓ Laptop and
personal computers
Which of the programming languages below is the most common (often considered standard)
language used in PLC? Ans: ✓ ✓ ✓ Ladder logic
What is a Rack as defined by Siemens? Ans: ✓ ✓ ✓ A device that accommodates the modules and
connects them to each other.
What is the function of a power supply? Ans: ✓ ✓ ✓ provides the power to the CPU and the
internal circuitry of connected modules.
What type of module adapts the signals from field devices to the internal signal level? Ans: ✓ ✓ ✓
Signal modules
In S7-300 controllers, how many I/O modules can be plugged into the central rack? Ans: ✓ ✓ ✓ 8
In newer S7-300 CPUs, the _____ is a non-volatile memory device that stores the user program and
acts as the load memory of the PLC. Ans: ✓ ✓ ✓ MMC
In S7-300 CPUs, is the MMC required to operate the unit? Ans: ✓ ✓ ✓ Yes
What is the maximum permissible current per rack? (S7-300) Ans: ✓ ✓ ✓ 1.2A
_____ are used to scan the signal states of momentary-contact switches an limit switches. Ans: ✓
✓ ✓ Discrete input modules
_____ are used to control contactors and lamps. Ans: ✓ ✓ ✓ Discrete output modules
In system memory, what is a Timer? Ans: ✓ ✓ ✓ A location used to implement waiting and
monitoring times.
_____ are software-level locations used for up and down counting. Ans: ✓ ✓ ✓ Counters
How many stations can be present in one segment of a PROFIBUS DP network? Ans: ✓ ✓ ✓ 32
_____ offers a standard interface for transmission of mainly binary process data between an
"interface module" in the (central) programmable controller and the field devices using Industrial
Ethernet. Ans: ✓ ✓ ✓ PROFINET IO
A _____ is a connection between several devices for communication. Ans: ✓ ✓ ✓ Network
© Get it right 2025 Getaway - Stuvia US All rights reserved
SIEMENS PLC TEST 1 Questions with Detailed Verified
Answers
What is a programmable logic controller(PLC)? Ans: ✓ ✓ ✓ An industrial grade computer that is
capable of being programmed to perform control functions.
Which of the following is not an advantage PLC offers over conventional relay-based control
systems? Ans: ✓ ✓ ✓ Ability to Control High Voltage/Current Directly
A(n) _____ architecture design allows the system to be easily connected to devices and programs
from other manufacturers. A(n) _____ architecture makes connecting devices from different
manufacturers more challenging Ans: ✓ ✓ ✓ open | proprietary
Inputs and Outputs (I/O) are integrated into the PLC in either _____. Ans: ✓ ✓ ✓ fixed or modular
configurations
When I/O is modular, it slots into the _____. It connects to the backplane allowing the CPU to
communicate with the modules. Ans: ✓ ✓ ✓ Rack or chassis
Which of the following is a function of the Processor Module or CPU? Ans: ✓ ✓ ✓ Executes the
stored user program from memory.
Sends appropriate output commands to control devices.
Accepts input data from sensing devices.
Which of the following describes the function of I/O modules? Ans: ✓ ✓ ✓ Forms the interface
between the CPU and the field devices
Which of the following is not powered by the Power Supply? Ans: ✓ ✓ ✓ Field device
© Get it right 2025 Getaway - Stuvia US All rights reserved
, Click here for more: Scholars nexus
What are the two most common types of PLC programming devices? Ans: ✓ ✓ ✓ Laptop and
personal computers
Which of the programming languages below is the most common (often considered standard)
language used in PLC? Ans: ✓ ✓ ✓ Ladder logic
What is a Rack as defined by Siemens? Ans: ✓ ✓ ✓ A device that accommodates the modules and
connects them to each other.
What is the function of a power supply? Ans: ✓ ✓ ✓ provides the power to the CPU and the
internal circuitry of connected modules.
What type of module adapts the signals from field devices to the internal signal level? Ans: ✓ ✓ ✓
Signal modules
In S7-300 controllers, how many I/O modules can be plugged into the central rack? Ans: ✓ ✓ ✓ 8
In newer S7-300 CPUs, the _____ is a non-volatile memory device that stores the user program and
acts as the load memory of the PLC. Ans: ✓ ✓ ✓ MMC
In S7-300 CPUs, is the MMC required to operate the unit? Ans: ✓ ✓ ✓ Yes
What is the maximum permissible current per rack? (S7-300) Ans: ✓ ✓ ✓ 1.2A
_____ are used to scan the signal states of momentary-contact switches an limit switches. Ans: ✓
✓ ✓ Discrete input modules
_____ are used to control contactors and lamps. Ans: ✓ ✓ ✓ Discrete output modules
In system memory, what is a Timer? Ans: ✓ ✓ ✓ A location used to implement waiting and
monitoring times.
_____ are software-level locations used for up and down counting. Ans: ✓ ✓ ✓ Counters
How many stations can be present in one segment of a PROFIBUS DP network? Ans: ✓ ✓ ✓ 32
_____ offers a standard interface for transmission of mainly binary process data between an
"interface module" in the (central) programmable controller and the field devices using Industrial
Ethernet. Ans: ✓ ✓ ✓ PROFINET IO
A _____ is a connection between several devices for communication. Ans: ✓ ✓ ✓ Network
© Get it right 2025 Getaway - Stuvia US All rights reserved
