500-801 · Question #12
Which three options rely on user services in an Industrial Automation Control System? (Choose three.)
The correct answer is A. human machine interface B. safety parameters for predictable shutdown C. motion applications. In an IACS, user services are the plant-floor-level applications that operators directly interact with or configure to run and monitor the control system - making A (HMI), B (safety parameters), and C (motion applications) correct, since each operates within the IACS layer and…
Question
Which three options rely on user services in an Industrial Automation Control System? (Choose three.)
Options
- Ahuman machine interface
- Bsafety parameters for predictable shutdown
- Cmotion applications
- Dlogistics applications
- Eenterprise resource planning applications
How the community answered
(42 responses)- A90% (38)
- D7% (3)
- E2% (1)
Explanation
In an IACS, user services are the plant-floor-level applications that operators directly interact with or configure to run and monitor the control system - making A (HMI), B (safety parameters), and C (motion applications) correct, since each operates within the IACS layer and is driven by user interaction or user-defined configuration.
D (logistics) is wrong because logistics applications belong to the supply chain/operations management layer above the control system, not within the IACS user services tier. E (ERP) is wrong because enterprise resource planning sits at the highest business layer (Level 4 in the Purdue Model), communicating with the IACS indirectly rather than relying on its user services.
Memory tip: Picture the plant floor operator's daily touchpoints - they stare at the HMI, configure safety shutdowns, and tune motion profiles. Logistics and ERP live in the front office, not on the factory floor.
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