Using CitectSCADA > Implementing Clustering > I/O Server Definitions

I/O Server Definitions

Note the default server port numbers under Configure Servers.

To configure an I/O Server

  1. In the Project Editor, choose Servers | I/O Servers.
  2. In the I/O Servers dialog box, complete the properties.



Cluster Name

The name of the cluster to which this I/O Server will belong. If there is only one cluster defined in the project, you can leave this field blank. The I/O Server will default to the defined cluster. 16 characters maximum.

Server Name

The name of the server. The name needs to be unique to the project and any included projects, and not contain spaces. 16 characters maximum.

Network Addresses

The network address(es) of the server being configured. To specify dual network connections to the server, use a comma delimited list. See Network Redundancy. 70 characters maximum.


The port this server will listen on. You may leave this blank in which case the default port number will be used. 16 characters maximum.


Any useful comment. This property is optional and is not used at runtime. 48 characters maximum.

Extended forms fields

The following fields are implemented with extended forms (press F2).

Note: Servers listen on legacy ports only if the INI parameter [LAN]EarliestLegacyVersion has been enabled.

Option Description

Legacy Port

Allows legacy connections to the server

  1. Click the Add button to append a new record, or Replace if you have modified a record.