Siemens SIMATIC NET Especificações descarregar pdf (Página 66)

56 Siemens Simatic S7 Driver Online Help

Simulating a connection to the process hardware is accomplished by writing values

directly to the datablocks themselves instead of sending a request to the SI7 server to

write the data to the process hardware. Likewise, values are read directly from each

datablock and do not require a read request sent to the SI7 server. These reads always

return good data quality.

NOTE: Whenever you enable or disable simulation mode, close all connections to

the I/O Server and restart the Power Tool in order for your changes to take effect.

See Also

Making Advanced Settings | Running the Driver in Simulation Mode

Feature: Using Latched Data

You can preserve a datablock’s last value by enabling the Latch Data option. Should

a communication failure occur, data links to unlatched datablocks display a series of

question marks (?????) while data links to latched datablocks display the last data

polled. This feature is very useful when you need to create reports about your process

and require data at all times. You can also use this option to preserve the last values

on the screen after a communication failure occurs.

NOTE: FIX 6.15 does not support latched data. However, you can add support for

latched data by downloading the SAC Software Improvement Module (SIM) from

Intellution’s web site.

Analog Register and Digital Register blocks do not support latched data.

Consequently, we do not recommend using these blocks with the Latch Data option.

Question marks appear in the latched data links until data is received from the

process hardware.

Example

Your control system communicates with remote devices by radio transmission. You know that

radio transmission is not always reliable (particularly during inclement weather). However,

you must provide daily reports from your process hardware.

By enabling the Latch Data option for your datablocks, you ensure data is always available for

reports.

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