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SACA C-103 CERTIFIED INDUSTRY 4.0
ASSOCIATE – ROBOT SYSTEM
OPERATIONS EXAMINATION COMPLETE
QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE
SECTION 1: ROBOT SAFETY & RISK ASSESSMENT (Questions 1–8)
Q1: A robot cell uses a fixed barrier guard with an interlocking gate. Per ISO 10218-1 and RIA
R15.06, which risk reduction measure category does this combination represent?
A. Category 1 – Well-tested components and safety principles
B. Category 2 – Safety function checked by machine control system
C. Category 3 – Redundant monitoring with single-fault detection [CORRECT]
D. Category 4 – Redundant monitoring with accumulation of faults detection
Correct Answer: C
Rationale: Correct because a fixed barrier with interlocking gate employing redundant
monitoring and single-fault detection aligns with ISO 13849-1 Category 3 requirements for robot
safeguarding systems.
Q2: During a risk assessment, a robot operation is rated Severity 4 (irreversible injury) and
Probability 3 (possible under specific conditions). What is the required risk reduction priority
per the standard risk assessment matrix?
A. Low priority – acceptable with standard guarding
B. Medium priority – warning signs and training sufficient
C. High priority – engineering controls mandatory [CORRECT]
D. No action required – residual risk acceptable
Correct Answer: C
Rationale: Correct because a Severity 4 × Probability 3 rating falls in the high-risk zone of the
standard risk matrix, requiring engineered safeguarding controls per ISO 10218-2 and RIA
R15.06.
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Q3: An E-stop button on a robot controller is wired to immediately remove power from motor
drives without controlled deceleration. This describes which E-stop category?
A. Category 0 – Uncontrolled stop by immediate removal of power [CORRECT]
B. Category 1 – Controlled stop with power available to brakes
C. Category 2 – Controlled stop with power removed after stop
D. Category 3 – Monitored stop with maintained power
Correct Answer: A
Rationale: Correct because Category 0 E-stops achieve an uncontrolled stop through immediate
power removal to motor drives, per ISO 13850 and IEC 60204-1 definitions.
Q4: A collaborative robot application employs power and force limiting to ensure contact forces
remain below 150 N. Which ISO/TS 15066 collaborative operation mode is being implemented?
A. Safety-rated monitored stop
B. Hand guiding
C. Speed and separation monitoring
D. Power and force limiting [CORRECT]
Correct Answer: D
Rationale: Correct because ISO/TS 15066 defines power and force limiting as the collaborative
mode where inherent robot design limits contact forces to biologically safe thresholds, typically
below 150 N for transient contact.
Q5: A technician must perform maintenance inside a robot work envelope. Per lockout/tagout
(LOTO) procedures, which step must be completed BEFORE physically entering the cell?
A. Place the robot in automatic mode and verify cycle time
B. Isolate energy sources, apply locks/tags, and verify zero energy state [CORRECT]
C. Notify the production supervisor only
D. Press the E-stop and enter immediately
Correct Answer: B
Rationale: Correct because standard Industry 4.0 practice requires complete energy isolation,
application of lockout/tagout devices, and verification of zero energy state before any personnel
entry per OSHA 1910.147 and ISO 10218-2.
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Q6: A safety light curtain is installed at the perimeter of a robot cell. The response time of the
light curtain and safety relay must be less than the robot's stopping time to ensure:
A. The robot completes its current cycle before stopping
B. The robot cannot reach the hazard point before the operator [CORRECT]
C. The light curtain resets automatically after beam restoration
D. The operator can override the safety system in emergencies
Correct Answer: B
Rationale: Correct because Per RIA/ISO safety standards, safety device response time must be
less than the robot stopping time to ensure the robot cannot reach the hazard point before the
safety system initiates protective stopping.
Q7: A laser scanner is configured with a warning zone (4 m) and a safety zone (1.5 m). When an
operator breaches the warning zone, the robot:
A. Immediately executes an E-stop Category 0
B. Reduces to safe monitored speed while continuing operation [CORRECT]
C. Continues at full speed with audible alarm only
D. Switches to manual mode automatically
Correct Answer: B
Rationale: Correct because standard Industry 4.0 practice requires laser scanner warning zones
to trigger reduced safe speed operation, while safety zone intrusion initiates protective
stopping, per ISO 13855 and ISO/TS 15066.
Q8: In a risk assessment for a new robot installation, which factor is NOT typically evaluated
when determining the required Performance Level (PL)?
A. Severity of potential injury
B. Frequency and duration of exposure
C. Possibility of avoiding or limiting harm
D. Robot programming language used [CORRECT]
Correct Answer: D
Rationale: Correct because the programming language has no bearing on the ISO 13849-1 PL
determination, which is based solely on severity, frequency/duration of exposure, and
possibility of avoidance.
SACA C-103 CERTIFIED INDUSTRY 4.0
ASSOCIATE – ROBOT SYSTEM
OPERATIONS EXAMINATION COMPLETE
QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE
SECTION 1: ROBOT SAFETY & RISK ASSESSMENT (Questions 1–8)
Q1: A robot cell uses a fixed barrier guard with an interlocking gate. Per ISO 10218-1 and RIA
R15.06, which risk reduction measure category does this combination represent?
A. Category 1 – Well-tested components and safety principles
B. Category 2 – Safety function checked by machine control system
C. Category 3 – Redundant monitoring with single-fault detection [CORRECT]
D. Category 4 – Redundant monitoring with accumulation of faults detection
Correct Answer: C
Rationale: Correct because a fixed barrier with interlocking gate employing redundant
monitoring and single-fault detection aligns with ISO 13849-1 Category 3 requirements for robot
safeguarding systems.
Q2: During a risk assessment, a robot operation is rated Severity 4 (irreversible injury) and
Probability 3 (possible under specific conditions). What is the required risk reduction priority
per the standard risk assessment matrix?
A. Low priority – acceptable with standard guarding
B. Medium priority – warning signs and training sufficient
C. High priority – engineering controls mandatory [CORRECT]
D. No action required – residual risk acceptable
Correct Answer: C
Rationale: Correct because a Severity 4 × Probability 3 rating falls in the high-risk zone of the
standard risk matrix, requiring engineered safeguarding controls per ISO 10218-2 and RIA
R15.06.
,2
Q3: An E-stop button on a robot controller is wired to immediately remove power from motor
drives without controlled deceleration. This describes which E-stop category?
A. Category 0 – Uncontrolled stop by immediate removal of power [CORRECT]
B. Category 1 – Controlled stop with power available to brakes
C. Category 2 – Controlled stop with power removed after stop
D. Category 3 – Monitored stop with maintained power
Correct Answer: A
Rationale: Correct because Category 0 E-stops achieve an uncontrolled stop through immediate
power removal to motor drives, per ISO 13850 and IEC 60204-1 definitions.
Q4: A collaborative robot application employs power and force limiting to ensure contact forces
remain below 150 N. Which ISO/TS 15066 collaborative operation mode is being implemented?
A. Safety-rated monitored stop
B. Hand guiding
C. Speed and separation monitoring
D. Power and force limiting [CORRECT]
Correct Answer: D
Rationale: Correct because ISO/TS 15066 defines power and force limiting as the collaborative
mode where inherent robot design limits contact forces to biologically safe thresholds, typically
below 150 N for transient contact.
Q5: A technician must perform maintenance inside a robot work envelope. Per lockout/tagout
(LOTO) procedures, which step must be completed BEFORE physically entering the cell?
A. Place the robot in automatic mode and verify cycle time
B. Isolate energy sources, apply locks/tags, and verify zero energy state [CORRECT]
C. Notify the production supervisor only
D. Press the E-stop and enter immediately
Correct Answer: B
Rationale: Correct because standard Industry 4.0 practice requires complete energy isolation,
application of lockout/tagout devices, and verification of zero energy state before any personnel
entry per OSHA 1910.147 and ISO 10218-2.
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Q6: A safety light curtain is installed at the perimeter of a robot cell. The response time of the
light curtain and safety relay must be less than the robot's stopping time to ensure:
A. The robot completes its current cycle before stopping
B. The robot cannot reach the hazard point before the operator [CORRECT]
C. The light curtain resets automatically after beam restoration
D. The operator can override the safety system in emergencies
Correct Answer: B
Rationale: Correct because Per RIA/ISO safety standards, safety device response time must be
less than the robot stopping time to ensure the robot cannot reach the hazard point before the
safety system initiates protective stopping.
Q7: A laser scanner is configured with a warning zone (4 m) and a safety zone (1.5 m). When an
operator breaches the warning zone, the robot:
A. Immediately executes an E-stop Category 0
B. Reduces to safe monitored speed while continuing operation [CORRECT]
C. Continues at full speed with audible alarm only
D. Switches to manual mode automatically
Correct Answer: B
Rationale: Correct because standard Industry 4.0 practice requires laser scanner warning zones
to trigger reduced safe speed operation, while safety zone intrusion initiates protective
stopping, per ISO 13855 and ISO/TS 15066.
Q8: In a risk assessment for a new robot installation, which factor is NOT typically evaluated
when determining the required Performance Level (PL)?
A. Severity of potential injury
B. Frequency and duration of exposure
C. Possibility of avoiding or limiting harm
D. Robot programming language used [CORRECT]
Correct Answer: D
Rationale: Correct because the programming language has no bearing on the ISO 13849-1 PL
determination, which is based solely on severity, frequency/duration of exposure, and
possibility of avoidance.
