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Chapter 4. How Do I? 35

Sending Multiple Writes to a Datablock

You can write data to various registers in the hardware at one time using the Block

Writes option. This option provides a special “send” command that instructs the

driver to send all outstanding writes in a single protocol message.

When the driver sends its outstanding writes, it also sends any unmodified values in

the datablocks that are changing using the last known value, as the following figure

shows. Consequently, we recommend relatively short poll times for datablocks you

are writing to so that the driver will have the most up-to-date data.

To send block writes through FIX

[1] Enable block writes in the datablock you want to use.

[2] Create a Digital Output block with the following address:

!Send:DataBlockName

Note that only datablock names are valid with the !Send control address. You cannot

trigger block writes using any of the following items:

• Channel and device names in place of a datablock name.

• Analog Output blocks in place of a Digital Output block.

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Siemens SIMATIC NET Spécifications Page 45