Applies To:
  • CitectSCADA 1.00, 1.01, 1.10, 1.11, 1.20, 2.00, 2.01
Summary:
The above error is documented in the User Guide as follows,

19    Driver is not responding

The server is not receiving any response from the driver. This error should not occur during normal operation. Try re-booting the computer to reset all drivers and hardware. If the problem persists, contact Citect Support. 

Solution:
This error can also be happen if the number of (Retries + 1) * Timeout > Watchtime and the PLC communications gets a timeout. This should not be the case unless you have modified these settings. The following is an example of how these settings would be made for Tiway protocol in the Citect.INI file.

[Tiway]
Retry=1
TimeOut=11000 ; mSeconds
WatchTime=30 ; Seconds

If you use the above settings and the PLC times out, a time out error will be reported. In the example below, a "Driver not responding" error will be reported if the PLC times out.

[Tiway]
Retry=2
TimeOut=11000 ; mSeconds
WatchTime=30 ; Seconds

These values are for example only and may not be correct for this driver. Also the "(Retries + 1) * Timeout > Watchtime" may vary from driver to driver. As a general rule these parameters should not be set, so that the driver can use the correct default value. For test purposes only it may be useful to set Retry=0 and Timeout=2000 (depending on expected response time, different for each protocol). This should any spurious errors that would normally be masked by the default settings.

See also Q2141.

For users of versions later than Citect 5.21 Spk B, refer to KB article Q2905. 
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