Applies To:
  • CitectSCADA 5.xx

Citect takes a long time to respond (or even bringing the unit offline) after the cable has been disconnected/connected to the Siemens S7 PLCs. This only happens if there is a network of S7 PLCs connected to a single Citect PC.

This situation also happens when Citect starts up and one of the PLCs is offline.


The function of the standard driver parameter Timeout had been modified so that it no longer controls the timeout duration.

A new parameter has been added to control the timeout duration when the driver does not receive a response from the S7 API. This parameter is designated "ConnTimeout". The default time for timeout is 5000ms.

CIT has confirmed this to be a problem in the S7 drivers up to and including V2.03.00. This has been fixed in version 2.03.01 and upwards.