Siemens SIMATIC NET Specifications download pdf (Page 154)

144 Siemens Simatic S7 Driver Online Help

Analog Register blocks can be configured to use driver datablocks with the following

data types: INT, WORD, DINT, DWORD, TIMER, COUNTER, BYTE, CHAR, and

REAL.

Digital Register blocks can be configured to use driver datablocks with the BYTE

data type.

You cannot use exception-based processing with datablocks configured as

COUNTER, TIMER, ASCII, or STRING.

To learn more about S7 memory, refer to Understanding S7 Hardware Memory

Organization.

Understanding Datablock Timing Properties: Rate, Phase, and

Access Time

The Primary Rate, Secondary Rate, Phase, and Access Time fields determine the

timing of the driver's polling process. The primary and secondary poll rates

determine how often the driver polls a datablock for data. The access time determines

which poll rate is used. By default, the primary poll rate is used. When the access

time expires, the secondary poll rate is used. If no secondary poll rate is specified, the

driver stops polling.

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Siemens SIMATIC NET Specifications Page 154