Arizona Siemens PLC Technician
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
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1. A Programmable Logic Controller (PLC) primarily uses which type of
memory to retain its program during power loss?
A. Volatile RAM
B. Non-volatile memory
C. Cache memory
D. Buffer memory
Non-volatile memory retains the user program and data even when
power is removed, which is essential for PLC operation.
2. In a typical Siemens PLC, what does “OB” stand for?
A. Output Branch
B. Operational Block
C. Organization Block
D. Output Block
Organization Blocks (OBs) define the cyclic and event-driven structure
of PLC execution.
,3. Which language defined by IEC 61131-3 uses graphical ladder
elements to represent logic?
A. Structured Text
B. Ladder Logic (LAD)
C. Function Block Diagram
D. Instruction List
Ladder Logic is a graphical programming language resembling relay
logic, widely used for control sequences.
4. What is the Siemens PLC series most commonly used in industrial
automation?
A. Allen-Bradley PLC-5
B. Modicon Quantum
C. SIMATIC S7
D. Omron NX
The SIMATIC S7 family is Siemens’ flagship PLC line used in various
industries.
5. In PLC I/O addressing, which of these represents an input address?
A. Q0.0
B. I0.0
C. M0.0
D. DB1.DBB0
Inputs are designated with an “I” prefix indicating physical input
modules.
6. What does “scan time” of a PLC refer to?
A. Time to compile code
B. Time to upload to HMI
C. Time to read inputs, execute logic, and update outputs
D. Time required for backup
, Scan time is the complete cycle of input reading, program execution,
and output updating.
7. Which Siemens tool is used to program S7-300 and S7-400 PLCs?
A. TIA Portal V17
B. WinCC Flexible
C. STEP 7 (TIA Portal)
D. PCS 7
STEP 7 within TIA Portal is the standard software for SIMATIC PLC
programming.
8. In PLC communication, what protocol is commonly used by Siemens
for industrial Ethernet?
A. EtherNet/IP
B. Modbus TCP
C. PROFINET
D. BACnet
PROFINET is Siemens’ industrial Ethernet protocol for deterministic
control and data exchange.
9. In Ladder Logic, what does a normally open (NO) contact represent?
A. Always closed
B. Closed when the corresponding bit is TRUE
C. Closed when the bit is FALSE
D. Permanently open
A NO contact closes when its associated condition or input bit is
TRUE.
10. What module type in a Siemens PLC processes analog signals?
A. Digital Input Module
B. Relay Output Module
C. Analog Input/Output Module
D. CPU without expansion
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. A Programmable Logic Controller (PLC) primarily uses which type of
memory to retain its program during power loss?
A. Volatile RAM
B. Non-volatile memory
C. Cache memory
D. Buffer memory
Non-volatile memory retains the user program and data even when
power is removed, which is essential for PLC operation.
2. In a typical Siemens PLC, what does “OB” stand for?
A. Output Branch
B. Operational Block
C. Organization Block
D. Output Block
Organization Blocks (OBs) define the cyclic and event-driven structure
of PLC execution.
,3. Which language defined by IEC 61131-3 uses graphical ladder
elements to represent logic?
A. Structured Text
B. Ladder Logic (LAD)
C. Function Block Diagram
D. Instruction List
Ladder Logic is a graphical programming language resembling relay
logic, widely used for control sequences.
4. What is the Siemens PLC series most commonly used in industrial
automation?
A. Allen-Bradley PLC-5
B. Modicon Quantum
C. SIMATIC S7
D. Omron NX
The SIMATIC S7 family is Siemens’ flagship PLC line used in various
industries.
5. In PLC I/O addressing, which of these represents an input address?
A. Q0.0
B. I0.0
C. M0.0
D. DB1.DBB0
Inputs are designated with an “I” prefix indicating physical input
modules.
6. What does “scan time” of a PLC refer to?
A. Time to compile code
B. Time to upload to HMI
C. Time to read inputs, execute logic, and update outputs
D. Time required for backup
, Scan time is the complete cycle of input reading, program execution,
and output updating.
7. Which Siemens tool is used to program S7-300 and S7-400 PLCs?
A. TIA Portal V17
B. WinCC Flexible
C. STEP 7 (TIA Portal)
D. PCS 7
STEP 7 within TIA Portal is the standard software for SIMATIC PLC
programming.
8. In PLC communication, what protocol is commonly used by Siemens
for industrial Ethernet?
A. EtherNet/IP
B. Modbus TCP
C. PROFINET
D. BACnet
PROFINET is Siemens’ industrial Ethernet protocol for deterministic
control and data exchange.
9. In Ladder Logic, what does a normally open (NO) contact represent?
A. Always closed
B. Closed when the corresponding bit is TRUE
C. Closed when the bit is FALSE
D. Permanently open
A NO contact closes when its associated condition or input bit is
TRUE.
10. What module type in a Siemens PLC processes analog signals?
A. Digital Input Module
B. Relay Output Module
C. Analog Input/Output Module
D. CPU without expansion
