In the tab "Process value", it is possible to select a process value type called "Arithmetic", which will activate this tab. Here you will be able to put together a formula for the process value. This formula will consist of two different process values and an arithmetic operation.
When one of the process values is changed, the operation is executed, and this result will then be used as a value on the new process value. The process value will not receive a new value, more often than the designated collection speed, no matter how often the underlying process values change.