Beckhoff EPP3504-0023 Short Manual page 134

Commissioning on EtherCAT Master
Fig. 61: Example program with variables after a compile process (without variable integration)
Warning 1990 (missing "VAR_CONFIG") after a compile process indicates that the variables defined as
external (with the ID "AT%I*" or "AT%Q*") have not been assigned. After successful compilation, TwinCAT
PLC Control creates a "*.tpy" file in the directory in which the project was stored. This file ("*.tpy") contains
variable assignments and is not known to the System Manager, hence the warning. Once the System
Manager has been notified, the warning no longer appears.
First, integrate the TwinCAT PLC Control project in the System Manager. This is performed via the context
menu of the PLC configuration (right-click) and selecting "Append PLC Project...":
Fig. 62: Appending the TwinCAT PLC Control project
134 Version: 1.2 EPP3504-0023