230 Siemens Simatic S7 Driver Online Help
[6] Verify that the SCU is configured to start the IOCNTRL program with the
command line parameter /a in the Task Configuration dialog box.
See Also
Automatic driver startup does not work
I am receiving overruns
Overruns do not necessarily indicate an error condition. They merely indicate that the
driver is trying to read more data than the process hardware or the network can
handle. You can minimize the number of overruns you receive by changing the
driver configuration.
To reduce overruns
[1] Try increasing the poll times for the individual datablocks.
[2] If the overruns are sporadic or only occur when the driver starts, try phasing
the datablocks so that the driver does not attempt to poll all the datablocks at
the same time.
[3] If your datablocks are phased, try stopping and restarting the driver, since
phasing only happens when the driver starts.
See Also
Understanding Overruns | Understanding Datablock Timing Properties: Rate, Phase,
and Access Time | Using Primary and Secondary Poll Rates with Access Time | Using
Phasing with Poll Rates | Feature: Phasing Poll Rates
My message rate is slow
If you have a slow message rate
Examine your devices for the incorrect communication processors, virtual
field devices, and connection names. If the driver is sending messages to
devices that are offline or do not exist, the driver performs a series of timeouts
and retries reducing message throughput. If you plan to have a device offline
for a period of time, disable the device until it is back online.
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