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146 Siemens Simatic S7 Driver Online Help
Refer to Using Primary and Secondary Poll Rates with Access Time for additional
examples of primary and secondary poll rates with access times.
Typically, you phase datablocks when you are collecting information from many
points on a single device. Phasing means staggering the first time at which the driver
polls its datablocks. When the phase time expires, the driver resumes reading its
datablocks at the specified primary or secondary poll rate. Refer to Using Phasing
with Poll Rates for an example of phasing datablocks.
IMPORTANT: Set the access time to be longer than the phase time or the datablock
will not be polled and the access time will expire before the phase begins.
See Also
Polling the Device only when Data is Being Accessed | Feature: Using Secondary
Poll Rates | Feature: Phasing Poll Rates | Using Primary and Secondary Poll Rates
with Access Time | I am receiving old data in my display
Using Primary and Secondary Poll Rates with Access Time
The following examples provide practical examples for combining your primary poll
rates, secondary poll rates, and access times. Use the examples to help you configure
your datablocks.
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