Siemens SIMATIC NET Specifikace stáhnout pdf (Strana 175)

Chapter 10. Configuring the I/O Driver from FIX/iFIX Applications165

Special Address Events

!SWITCH:DEVICE Toggles the communication path between the current and backup

device when any value is written to a Digital Output or Analog Output

block.

!MODE Enables polling to the channel, device, or datablock specified when a

value of 1 is written to a Digital Output block (Analog Output blocks

are not supported). Disabling a specified object occurs when a value

of 0 is written to a Digital Output block.

!POLL Triggers a demand (one-shot) poll of one of the following when any

value is written to a Digital Output or Analog Output block:

• A channel and all of its devices and datablocks

• A device and all of its datablocks

• A specified datablock

Using demand polling does not affect the configured poll rate of the

datablock. For example, if you demand poll a datablock 15 minutes

into a 30-minute scan cycle, the driver polls the datablock again in 15

minutes, as originally scheduled.

!SEND Sends a special command to the specified datablock when any value is

written to a Digital Output block. The command is sent only if the

Block Writes option is enabled in the datablock. The command

instructs the driver to send all outstanding writes for the specified

datablock to the process hardware in a single message.

When the driver sends its outstanding writes, it also sends the last

known values of any unmodified data in the datablocks that are

changing. Consequently, we recommend relatively short poll times

for datablocks you write to so that the driver will have the most up-to-

date data.

You cannot use an Analog Output block to trigger block writes.

For more information about using Block Writes, refer to Feature:

Block Writes.

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Siemens SIMATIC NET Specifikace Strana 175