What is override control

The override theory is so complicated; why does it seem similar to a chain reaction to me? That person with an example, please share it to take a look

Reply 3# heshengyibiao: It’s not the same concept, right? Override and cascading are different

Thank you, expert! :handshake

There are two main categories of security measures in chemical production: hard protection and soft protection. 　 Hard protection measures refer to the interlock protection control system. When the operating conditions of the production process exceed certain limits, the interlock protection system takes a series of corresponding actions, such as issuing alarms, switching from automatic control to manual control, and activating interlocks, in order to keep the production process in a relatively safe state. However, such strict protective measures often cause operating equipment to stop or slow down, resulting in significant economic losses. Thus, in practice, many safer and more economical soft protection measures have been developed to reduce the losses caused by parking. 　 So-called soft protection measures refer to the practice of, when the operating conditions in production exceed certain limits, not resorting passively to interlock protection or even shutting down the system, but instead automatically switching to a new control system. This new control system takes over the control of the production process from the original one, and once the operating conditions return to normal, it automatically switches back to the original control system. To determine whether the operating condition is normal, it is necessary to choose between the two control systems. Therefore, it is called a selective control system, and is sometimes also referred to as replacement control or override control.

Is PES regenerated through continuous reforming also a form of override control or soft protection?