# System Health Monitor

The equipment health monitor regularly measures parameters and stores them.

1. Select a controller in the Plant structure workspace .

2. Go to Controller .

   The workspace area displays the Controller menus.

   The Health menu displays environmental data and system health information.

Controller health monitor
Information | Value | Description
--- | --- | ---
Refresh command button | Degree C or F | Reads information from the controller and displays the latest result.
Controller temperature | Degree C or F | Latest temperature recording expressed in month/day/year hour:minute:second.
Battery status | OK/NOK | Monitors the memory and real time clock battery in the controller computer board. Status message NOK, means the battery needs to be changed as soon as possible to avoid loss of data or wrong results. Latest recording expressed in month/day/year hour:minute:second.
History command button |  | Provides a list of monitor readings.