> For the complete documentation index, see [llms.txt](https://docs.videc.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.videc.de/acron-9.3/en/anlagenkonfiguration/verbindungen/verbindung.md).
# Connection
Connections are connecting objects to other plants or to their database servers. With active connections, it is possible to integrate process variables from these plants into the current plant (Process variables / Context menu / [External process variables from connections](/acron-9.3/en/anlagenkonfiguration/verfahrensgroessen/km_vg.md#extvg)). The connection objects are configured and the names of process variables from the connection are specified here.
Note
To ensure access to a plant from ACRON version 7.3 as from SP7, for the plant concerned in the Designer in Plant Management on the 'Plant' tab:
* access must be provided via TCP/IP by server service.
* the associated port must be entered - this port is used for connecting in plant versions 8.2 and higher.
* the server service must be installed and running.
n the 'Process variables' dialog on the 'Allocation' tab the 'DataCollect / Connections' option must be enabled (Comment process variables are not available for connections).
## Connection data
### Server TCP/IP address
Display/enter the address or name of the server
### Server TCP/IP port
Display/enter the port
### Login
The [Login](/acron-9.3/en/anlagenkonfiguration/benutzerverwaltung/benutzer.md#name) must match a user of the included plant who as a minimum has the right to open the [Designer](/acron-9.3/en/anlagenkonfiguration/benutzerverwaltung/benutzergruppe/zugriffsrechte_designer.md#designer-oeffnen).
### Password
User's password
Note
If the password is not confirmed correctly, neither the password nor the confirmation can be saved.
### Synchronization interval - connected plant
Interval for cyclic synchronization with the configuration of the connected plant.
Note
If a plant is no longer accessible, the connection is flagged as inactive.
### Synchronization interval - disconnected plant
Interval for an attempt to connect to the disconnected plant. If a connection is made, the configuration is synchronized.
Note
If a plant is to remain disconnected for a lengthy period of time, set this interval to a very high value (30000).
### Time of last update
Time of the last synchronization with the connected plant.
Note
If the plant is not accessible, this time stamp is assigned the time of the last saved configuration.
### Time of last server configuration change
Time of the last configuration change in the connected plant.
Note
This time stamp is taken from the database server of the connected plant, and so can only be kept up-to-date with an active connection.
## Nomenclature for the process variables of the connection
### Identification
Display of the placeholder for designating the identification of the external process variable
### Name
Display of the placeholder for designating the name of the external process variable
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