HMI Web Server Settings

The configuration of the HMI web server is done using the 'HMI Webserver | Settings' editor. Here, the following settings can be configured:

Category Description

'Web Server' / 'Simulation' Read-only settings that display the HTTPS ports which are used to establish the connection to the web server of the controller or simulation. By default, HTTPS port 443 is used for both targets.

'Client(s)' The category provides the following parameters:

'Session timeout'
Defines the time in seconds after which the interruption of the connection to the client is considered to be gone. With enabled security (see below), the user has to re-authenticate to the HMI application when the client is idle for this amount of time.
The default value is 5000 ms. The value has a valid range of 1 to 86400000 ms (i.e., 1 day / 24 hours).

'Data timeout'
Defines how long the client will wait for a response from the web server before the request is considered as timed out.
The default value is 5000 ms. The value has a valid range of 1 to 86400000 ms (i.e., 1 day / 24 hours).

'Data poll interval'
The time how often the HMI client (web browser) polls the data (variables values) from the web server can be configured by setting the 'Data Poll Interval' value.
The default value is 250 ms. The value has a valid range of 1 to 86400000 ms (i.e., 1 day / 24 hours).

Note
The 'Data poll interval' value must not be greater than the 'Session timeout' value.

'Recovery countdown'
Specifies the time in seconds between attempts made by the server to reconnect to the client after the connection between the server and client has been lost.

'Security' The 'Enforcement of user levels' parameter enables or disables the security for HMI. It determines the authentication method that is to be used to access the HMI application.
With 'PLCnext user management', access checking to the HMI application is done by the user authentication mechanism configured on the controller. The access data of the users who are authorized to access the HMI application (call up the HMI application) and the access permissions for each user are managed via the User Manager function on the controller (accessible via Web Based Management).
Depending on the user role(s) assigned to the user, the user has read only access or read/write access to the HMI application.
With 'None', security for HMI is disabled, i.e., all HMI pages and objects are visible and enabled for all users when running the HMI application on the target. There is no authentication with a user name and password required to call up the HMI application.

Further Info
See the topic "Security for HMI" for further details.

'Update tasks' Interval at which the global system variables are updated from the running controller.