Which statement explains the correct position of a PLC within the CPwE architecture?
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A. B. C. D.C.
The CPwE (Converged Plantwide Ethernet) architecture is a reference model that provides guidelines for designing and deploying industrial automation and control systems. It consists of five hierarchical levels that represent different functions and responsibilities within the industrial control system. These levels are:
Level 0: Process control Level 1: Basic control Level 2: Area supervisory control Level 3: Manufacturing operations management Level 4: Site business planning
PLCs (Programmable Logic Controllers) are commonly used in industrial automation and control systems as a type of digital computer designed for industrial control applications. They can perform a variety of functions, including logic control, sequence control, motion control, and process control.
Based on the CPwE architecture, the correct position of a PLC is option C - PLCs are part of Level 1 - basic control.
Level 1 is responsible for basic control functions such as controlling individual machines and processes within a plant. PLCs are often used at this level for controlling sensors and actuators that interact directly with the process. PLCs can perform basic control functions such as on/off control, PID control, and sequencing.
Therefore, PLCs are not always part of Level 0 (Process control) as stated in option A. Process control systems typically use distributed control systems (DCS) rather than PLCs.
Option B (PLCs are part of Level 4 - site business planning) is incorrect as Level 4 is responsible for enterprise-level planning, such as coordinating production schedules, managing inventory, and integrating with business systems. PLCs are not typically used at this level.
Option D (PLCs are placed at Level 2 - area supervisory control) is also incorrect as Level 2 is responsible for supervising multiple machines and processes within a specific area of the plant. PLCs can be used at this level, but they are not typically used for supervisory functions. Instead, PLCs are used for basic control functions at Level 1, as mentioned earlier.
In summary, PLCs are typically used at Level 1 - basic control within the CPwE architecture.