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30 Siemens Simatic S7 Driver Online Help

Polling the Device only when Data is Being

Accessed

To poll the device only when data is being accessed

[1] From the I/O Driver Power Tool Tree Browser, select the datablock that you

want to modify.

[2] Enter DISABLED in the Secondary Rate field or clear the Secondary Rate

check box.

[3] Enter a value in the Access Time field. Do not enter DISABLED in the field.

[4] In the Primary Rate field, enter a value that is close to the data’s update rate in

the device.

Also, set the access time to be longer than the phase time or the datablock will not be

polled and the access time will expire before the phase begins.

See Also

Understanding Datablock Timing Properties: Rate, Phase, and Access Time | Using

Primary and Secondary Poll Rates with Access Time

Setting up Security to use the I/O Server

Remotely

The I/O Server supports DCOM (Distributed Component Object Model). If you want

to grant only certain users permission to launch or access the SI7 I/O Server, you can

use the Windows NT utility, DCOMCNFG.EXE, for configuring DCOM

applications. DCOMCNFG.EXE is usually located in your Windows \system32

directory. Under Windows 2000, you can use the Component Services in the

Administrative Tools folder. This folder resides in Control Panel.

IMPORTANT: We recommend that you allow client applications such as the

FIX/iFIX or the I/O Driver Power Tool to automatically start the I/O Server rather

than opening the Server independently from the Windows environment. This is the

intended method for Server start-up.

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Siemens SIMATIC NET Spécifications Page 40