Parameters and variables that are used to define the system or contain important
data in the Automation Server can be retained in a permanent memory. These
parameters and variables are automatically saved in the event of power failure, or
request for restart and are reloaded after startup.
You can define what kind of events that retention for the parameters and variables
should apply.
Retain Levels for Variables
There are three retain levels for the variables:
• No: The variable is reset to the value set when the object was created.
• Warm start: The value is set back to the last value set by the user.
• Cold start: The value is set back to the last value set by either the user or the
system (for instance by a program).
Configuration and Historic Database
A number of parameters describe the current configuration. The historic database
contains information collected from different sources. Parameters and historic
database are retained at both Warm and Cold start.
Fail-safe Start
A fail-safe start can only be initiated with a jumper connected between the
FACTORY and RET terminals. Configuration and historic database remain, but are
not started. The IP address settings are retained, but can be changed, as the
PuTTY console program can be used.
DFU Mode
The Device Firmware Upgrade mode can be used if the Automation Server does
not communicate in its normal operating mode. In the DFU mode, with a PC
connected to the USB device port on the Automation Server, the Device
Administrator can be used to update the firmware. For more information, see
section “Resetting the Automation Server” on page 55.
