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148 Siemens Simatic S7 Driver Online Help
NOTE: Specifying an access time that is shorter than a block’s scan time forces the
driver to poll at the secondary poll time. If the secondary poll time is disabled, the
driver stops polling the datablock.
See Also
Polling the Device only when Data is Being Accessed | Feature: Using Secondary
Poll Rates | Using Primary and Secondary Poll Rates with Access Time | Using
Phasing with Poll Rates | I am receiving old data in my display
Using Phasing with Poll Rates
The following examples provide a practical example for phasing the primary poll
rate. Use the example to help you configure your datablocks
Example 3
PollRec3
Primary Poll Rate = 10 seconds
Secondary Poll Rate = Disabled
Access Time = Disabled
The driver always polls PollRec3 at 10 seconds with this configuration because the access time
is disabled.
Example 4
PollRec4
Primary Poll Rate = Disabled
Secondary Poll Rate = Disabled
Access Time = Disabled
The driver does not read messages from PollRec4 on the device. This is the configuration for
a write-only datablock or a datablock that you demand poll. For more information about
demand polling a datablock, refer to Configuring a Driver for Demand Polling.
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