SACA Study Guide 2026
Everything you need to pass the SACA exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 SACA Exam Format at a Glance
📚 SACA Topics to Study (39)
✍️ Sample SACA Questions & Answers
1. A Safety Instrumented System (SIS) with a Probability of Failure on Demand (PFD) between 10⁻¹ and 10⁻² is classified at which SIL?
SIL 1 corresponds to a PFD range of 10⁻¹ to 10⁻², representing the lowest level of safety integrity under IEC 61508.
2. Per IEC 60204-1, Stop Category 0 on a machine is defined as:
Stop Category 0 is an uncontrolled stop achieved by immediately removing power (or interrupting energy) to the machine actuators, which is the default safe state for E-stop functions.
3. In a cyber-physical system, what is the primary function of the physical layer?
The physical layer in a CPS consists of sensors that measure real-world parameters and actuators that affect the physical environment, forming the bridge between the digital and physical worlds.
4. What is the purpose of 'robot simulation software' (e.g., ABB RobotStudio, FANUC ROBOGUIDE) in modern automation cell design?
Robot simulation software lets engineers design the cell, program robot paths, check for collisions, verify all positions are reachable, optimize cycle times, and generate downloadable programs — all virtually, before the physical cell is built.
5. What is 'hydraulic lock' in a cylinder circuit and how does a 'pilot-operated check valve' prevent unwanted cylinder drift?
Hydraulic lock uses pilot-operated check valves (POCVs) on both cylinder ports — each POCV allows flow into the cylinder freely but blocks reverse flow (drift) unless the pilot signal (from the opposite port's pressure) opens it. This positively locks the cylinder in position when the directional valve is centered.
6. In a mechatronic system, what is the role of a digital-to-analog converter (DAC)?
A DAC converts the digital output of a microcontroller or DSP (a numeric value) into a proportional analog voltage or current signal, which is used to drive analog-input actuators such as proportional valves or servo amplifiers.