Which statement explains the correct position of a PLC within the CPwE architecture?

Question

Options

• APLCs are always part of Level 0 - process control.
• BPLCs are part of Level 4 - site business planning.
• CPLCs are part of Level 1 - basic control.
• DPLCs are placed at Level 2 - area supervisory control.

• A
  3% (1)
• B
  9% (3)
• C
  85% (28)
• D
  3% (1)

Explanation

PLCs (Programmable Logic Controllers) reside at Level 1 - Basic Control in the CPwE (Converged Plantwide Ethernet) architecture, where they execute real-time control logic by reading sensor inputs and driving actuator outputs. This level sits directly above Level 0 (field devices like sensors and actuators), making PLCs the first layer of intelligence in the control hierarchy.

• A is wrong because Level 0 contains only field-level devices - sensors, actuators, and drives - not controllers that execute logic.
• B is wrong because Level 4 is the enterprise/ERP tier (SAP, business planning), completely separate from plant-floor control.
• D is wrong because Level 2 is reserved for supervisory systems like SCADA and HMIs that monitor PLCs, not the PLCs themselves.

Memory tip: Think of the levels as a ladder - sensors/actuators are the floor (L0), PLCs are the first rung you grab to start controlling (L1), SCADA/HMI is above that watching the action (L2), and business systems are at the top (L4). "1 = first controller" anchors PLCs at Level 1.

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