Siemens SIMATIC NET Spezifikationen PDF herunterladen (Seite 50)

40 Siemens Simatic S7 Driver Online Help

[1] I/O Server

Is the I/O driver core. The I/O Server contains objects and interfaces that

perform the following tasks:

• Maintain the I/O driver configuration.

• Read and write process hardware data.

• Expose the driver functionality through OLE Automation.

[2] Server Objects

Consist of the following objects:

• Driver Object to manage channel objects and the overall state of the

driver.

• Channel Object to define the properties and methods that govern the

behavior of a channel. A channel is an I/O driver’s communication

path.

• Device Object to define the properties and methods that govern the

behavior of a device. A device is a hardware device or station that

exists on a channel.

• Datablock Object to define the properties and methods that manage the

behavior of a datablock. The datablock object is an addressable portion

of a device and contains datablocks in the Server’s local memory

corresponding to data areas in the Common Memory DLL. When you

add new datablocks to the Server’s local memory, you also add new

data areas to the Common Memory DLL.

[3] OLE Interfaces

Expose the data and functionality of the Server to other applications.

[4] I/O Library

Translates generic driver requests into API-specific calls to the process

hardware.

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