An MCR zone requires how many MCR coils for operation?

In a Minimum Control Required (MCR) zone, the operation relies on a specific number of MCR coils to effectively manage control and ensure safety within the system. The requirement for two MCR coils reflects the necessity for redundancy and reliability in control systems.

By utilizing two coils, the system can maintain operational integrity and ensure that critical functions can continue even if one coil fails. This redundancy is essential in critical applications, as it provides a safeguard against potential malfunctions, enhancing the overall safety and reliability of the programmable controller system. Such a design is integral in maintaining control over various processes and minimizing the risk of operational failure.

The choice of having more or fewer than two coils does not align with the standard practice of ensuring sufficient redundancy and reliability in MCR function. This structure allows for a more robust and fault-tolerant design in industrial automation applications, which is crucial for maintaining control over processes in various environments.