FANUC Safety Standards & Compliance in Robotics 3 — Questions and Answers
Question 1: In the context of FANUC robot safety, what does 'T1 mode' limit regarding maximum TCP speed?
- 500 mm/s
- 250 mm/s (Correct answer)
- 100 mm/s
- 1000 mm/s
Correct answer: 250 mm/s
T1 (teach mode 1) limits maximum TCP speed to 250 mm/s regardless of programmed speed, ensuring slow motion during manual operation inside the safeguarded space.
Question 2: According to RIA TR R15.306, a task-based risk assessment for robotic systems must evaluate severity of harm based on which factors?
- Only the probability of occurrence
- Severity of injury and probability of occurrence only
- Severity of injury, probability of occurrence, and possibility of avoiding the hazard (Correct answer)
- Only the severity of injury
Correct answer: Severity of injury, probability of occurrence, and possibility of avoiding the hazard
Risk assessment per RIA TR R15.306 evaluates three factors: severity of potential injury, probability (likelihood) of occurrence, and the possibility of avoiding or limiting the harm.
Question 3: A safety light curtain is classified as which type of safeguard under ANSI/RIA R15.06?
- Fixed guard
- Presence-sensing device (PSD) (Correct answer)
- Enabling device
- Two-hand control device
Correct answer: Presence-sensing device (PSD)
Light curtains are electro-sensitive protective equipment (ESPE) classified as presence-sensing devices (PSDs) that detect intrusion into the safeguarded space.
Question 4: Which FANUC safety function uses a camera or zone sensor to slow the robot as a human approaches, without requiring a full stop?
- DCS Speed Check
- Collaborative Robot Safety (CRS) with PSD input (Correct answer)
- Dual Check Safety Position Check
- Safety I/O monitoring
Correct answer: Collaborative Robot Safety (CRS) with PSD input
Collaborative Robot Safety (CRS) with presence-sensing device input implements speed and separation monitoring, reducing robot speed proportionally as the human enters inner zones.
Question 5: What does IEC 62061 SIL 2 certification for a safety function indicate about the probability of dangerous failure on demand (PFDavg)?
- Between 10⁻⁵ and 10⁻⁴ (Correct answer)
- Between 10⁻³ and 10⁻²
- Between 10⁻⁴ and 10⁻³
- Less than 10⁻⁵
Correct answer: Between 10⁻⁵ and 10⁻⁴
SIL 2 per IEC 62061 corresponds to a PFDavg range of ≥10⁻⁵ to <10⁻⁴, representing a high degree of reliability for safety-related control functions.
Question 6: Under OSHA 29 CFR 1910.147 (Lockout/Tagout), when must lockout procedures be used instead of tagout for FANUC robot maintenance?
- Always — tagout is never permitted on robots
- When the energy isolating device is capable of being locked out (Correct answer)
- Only during pneumatic energy isolation
- Only when electrical energy exceeds 480V
Correct answer: When the energy isolating device is capable of being locked out
OSHA 1910.147 requires lockout (not tagout) whenever the energy isolating device is capable of being locked; tagout is only permitted when lockout is physically impossible.
Question 7: Which ISO standard specifically addresses safety requirements for industrial robots working collaboratively with humans (cobots)?
- ISO 10218-2
- ISO/TS 15066 (Correct answer)
- ISO 13849-1
- ISO 11161
Correct answer: ISO/TS 15066
ISO/TS 15066 is the technical specification that defines safety requirements and guidance for collaborative robot systems, supplementing ISO 10218-1 and 10218-2.
FANUC Safety Standards & Compliance in Robotics 3
In the context of FANUC robot safety, what does 'T1 mode' limit regarding maximum TCP speed?