What does the term 'frozen DCS value' imply?

The term 'frozen DCS value' refers to a situation where a data point in a Distributed Control System (DCS) is held at a constant value and does not change until it is explicitly updated. This typically occurs when there is a disruption in data flow or communication, such as during maintenance, system updates, or other operational scenarios that prevent real-time data updates.

In practical terms, when a DCS value is 'frozen,' it means that the last received value will continue to be displayed on the interface or in the system output until new data arrives. This ensures operators can continue to monitor the situation even when real-time data is not available, but it also emphasizes the need to check for updates when the system resumes normal operation. Understanding this concept is crucial for interpreting data correctly and maintaining effective control in industrial environments.