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Concept Concept 8/15/2022
Products: AS-B, AS-P
Functionalities: Hardware
Product version: 3.3, 2022

Automation Server Reset Functions

There are four different types of reset for the automation servers: warm start, cold start, reset, and reset to DFU mode. Depending on the type of reset, the automation server can be reset using the reset button or a command from WorkStation.

Location of reset button and USB device port on different server models

Location of reset button and USB device port on different server models

You can use a straigthened segment of a paper clip or a similar tool to press the reset button.

Automation Server Reset Functions

Type

Triggered by

Description

Variable values

Configuration, Historic database

IP settings

Warm start

Command from WorkStation

Stops the automation server application and then restarts the application.

Affected according to the configured retain levels for the variables

Retained

Retained

Cold start

Command from WorkStation

Stops the automation server application and then restarts the application.

Affected according to the configured retain levels for the variables

Retained

Retained

Reset

Short push on Reset button

Power return

Stops the automation server application and the operating system and then restarts the operating system and the application.

Affected according to the configured retain levels for the variables

Retained

Retained

Reset to DFU mode

3 pushes on Reset button within 2 seconds

Puts the automation server into DFU mode, which enables Device Administrator to communicate with the server.

Not applicable

Not retained

Not retained

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

Variables have a configurable retain level, which controls if the value of the variable is retained after a restart of the automation server. There are three retain levels:

  • No

  • Warm start

  • Cold start

The following table lists what is retained after a warm start, cold start, or reset based on the configured retain level.

Retained Variable Values Depending on Reset Type and Retain Level

Reset type

Retain level:

No

Retain level:

Warm start

Retain level:

Cold start

Warm start

Default value a

Values configured by a user or application are lost.

Variable retains last value configured by a user.

Values configured by an application are retained. 

Variable retains last value configured by a user.

Values configured by an application are retained. 

Cold start

Default value a

Values configured by a user or application are lost.

Variable retains last value configured by a user.

Values configured by an application are lost.

Variable retains last value configured by a user.

Values configured by an application are retained. 

Reset

Default value a

Values configured by a user or application are lost.

Variable retains last value configured by a user.

Values configured by an application are retained. 

Variable retains last value configured by a user.

Values configured by an application are retained. 

  1. Default value is the value the variable gets when it is created.

For more information, see Retain Level .

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.

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 Resetting an Automation Server to DFU Mode .

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