Siemens Commissioning PC Stations C79000-G8976-C156-07 User Manual

Page 59

Project Engineering for the OPC Server

Commissioning PC Stations - Manual and Quick Start
Release 5/2005

C79000-G8976-C156-07

Table 5-1

Parameter

/ Function

Possible Settings / Significance

Can be set for a specific protocol

/ Function

FDL

FMS

ISO/TCP

class 2

PROFInet

PROFInet IO

SNMP

Scan cycle
time

Here, you make the settings to control
updating by the OPC Server.

The scan cycle time decides how often
the OPC server updates the values the
OPC items.

Access
protection

You can specify the access rights to
individual variables or variable groups for
each specific protocol. You can, for
example, prevent variables calculated
internally by the controller from being
overwritten.

As default, no access protection is
activated.

VFD

VFD (Virtual Field Device) is the neutral
description of a device used in FMS.
Communication connections (FMS
connections) are then configured for the
VFDs in project engineering.

Here, you inform the OPC server of the
required VFDs. During project
engineering, you then assign the VFD to
the FMS connection. When accessing
variables in the PC application, you also
reference the VFD.

Extra function: creating the object
dictionary

Here, you can also create the object
dictionary (OD) belonging to a VFD. The
FMS variables (name and structure) are
defined in the object dictionary.

Connection
parameters

Here, you can make the settings required
for communication for services that do
not require specific connections to be
configured in project engineering.

Segmenta-
tion

Special settings for providing the data
buffers independent of specific
connections.

Use
symbols

Please note that the parameters are described in detail in the online help for each
individual dialog in NCM PC.