Siemens SIMATIC WinAC Slot 412 User manual

Important Information, Contents
Product Overview 1
Installing WinAC Slot 41x 2
Getting Started 3
Using the Tool Manager 4
Appendices
Index
06/2000
A5E00065531-03
Windows Automation Center
WinAC Slot 412/WinAC Slot 416
Version 3.1
Overview
This manual is part of the documentation package with order no:
6ES7 673-6CC01-8BA0
SIMATIC

Index-2WindowsAutomation Center WinAC Slot 412/WinAC Slot 416 Version 3.1
A5E00065531-03
!Danger
indicates that death, severe personal injury or substantial property damage will result if proper precau-
tions are not taken.
!Warning
indicates that death, severe personal injury or substantial property damage can result if proper precau-
tions are not taken.
!Caution
indicates that minor personal injury or property damage can result if proper precautions are not taken.
Note
draws your attention to particularly important information on the product, handling the product, or to a
particular part of the documentation.
Qualified Personnel
Only qualified personnel should be allowed to install and work on this equipment. Qualified persons
are defined as persons who are authorized to commission, to ground, and to tag circuits, equipment,
and systems in accordance with established safety practices and standards.
Correct Usage
Note the following:
!Warning
This device and its components may only be used for the applications described in the catalog or the
technical descriptions, and only in connection with devices or components from other manufacturers
which have been approved or recommended by Siemens.
This product can only function correctly and safely if it is transported, stored, set up, and installed cor-
rectly, and operated and maintained as recommended.
Trademarks WinAC, SIMATIC, SIMATIC HMIand SIMATIC NETare registered trademarks of SIEMENS AG.
Some of other designations used in these documents are also registered trademarks; the owner’s rights
may be violated if they are used by third parties for their own purposes.
Safety Guidelines
This manual contains notices which you should observe to ensure your own personal safety, as well as to
protect the product and connected equipment. These notices are highlighted in the manual by a warning
triangle and are marked as follows according to the level of danger:
We have checked the contents of this manual for agreement with the hard-
ware and software described. Since deviations cannot be precluded entirely,
we cannot guarantee full agreement. However, the data in this manual are
reviewed regularly and any necessary corrections included in subsequent
editions. Suggestions for improvement are welcomed.
Disclaimer of LiabilityCopyright Siemens AG 1998-2000 All rights reserved
The reproduction, transmission or use of this document or its contents is not
permitted without express written authority. Offenders will be liable for
damages. All rights, including rights created by patent grant or registration of
a utility model or design, are reserved.
Siemens AG
Automation and Drives (A&D)
Industrial Automation Systems (AS)
Postfach 4848, D- 90327 Nürnberg SiemensAG 1998-2000
Technical data subject to change.
Siemens AktiengesellschaftA5E00065531

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Important Information
Purpose of the manual
The software and hardware components of the Windows Automation Center
(WinAC) allow you the combined solution consisting of data processing, control,
visualization and communications on your PC (PC-based control). The following
versions of the WinAC product are available:
WinAC Slot 412
WinAC Slot 416
This manual will familiarize you with the individual components ofthe WinAC Slot 412
and WinAC Slot 416 product versions by way of an overview.

Important Information
iv WindowsAutomation Center WinAC Slot 412/WinAC Slot 416 Version 3.1
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Package as supplied
This package has the Order Number 6ES7 673-6CC01-8BA0 and consists of three
manuals and a list of instructions containing the following:
Overview of the Windows Automation Center WinAC Slot 412/WinAC Slot 416
Overview of the components of WinAC
Instructions for installing the software
Getting started
Manual “WinAC Controlling with CPU 412-2 PCI/CPU 416-2 PCI; Set-Up, CPU Data”
Installing and wiring CPUs 41x-2 PCI and the PS extension board
Commissioning CPUs 41x-2 PCI and the PS extension board
Description of control panel, router, time synchronization
Technical specifications
Compatibility with CPU 416-2 DP ISA/CPU 416-2 DP ISA Lite
Manual “SIMATIC Computing”
Function and running of the SIMATIC Computing software
Description of the controls
S7-400 instruction list
Instruction set for all CPUs
Brief description of instructions and execution times
List of OBs, system events, SSL IDs, SFCs/SFBs
Audience
This manual is intended for engineers, programmers, and maintenance personnel
who have a general knowledge of programmable logic controllers.
Scope and usage of the manual
The functions and running of the software for WinAC Slot 41x is described in the
form of an overview. It contains:
overviews of the components contained in the WinAC Slot 41x package
instructions for installing the software for WinAC Slot 41x

Important Information
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Applicability
The manual contains information that is valid at the time of the manual being
published. We reserve the right to enclose further information in the form of a
Product Information bulletin.
Additional support
Should you have any questions on using the products described in the manual to
which you cannot find answers in the manual, please get in touch with your contact
at your local Siemens agency or office.
If you have any questions or suggestions concerning this manual, please fill in the
form at the end of this manual and return it to the specified address. Please feel
free to enter your personal assessment of the manual in the form provided.
We offer a range of courses to help get you started with the SIMATIC S7
automation system. Please contact your local training center or the central training
center in Nuremberg, D-90327 Germany (tel. [phone]).
Constantly updated information
You can obtain up-to-the-minute information on SIMATIC products:
On the Internet at http://www.ad.siemens.de/
By dialing the fax polling number [phone]
In addition, the SIMATIC Customer Support provides up-to-date information and
downloads for users of SIMATIC products:
On the Internet at http://www.ad.siemens.de/simatic-cs
Via the SIMATIC Customer Support mailbox at the following number:
[phone]
To access the mailbox, use a modem with up to V.34 (28.8 kbps), and set the
parameters as follows: 8, N, 1, ANSI. Alternatively, access it using ISDN
(x.75, 64 kbps).
You can reach SIMATIC Customer Support by telephone at [phone]
and by fax at [phone]. Queries can also be addressed to us by Internet
mail or by mail to the mailbox specified above.

Important Information
vi WindowsAutomation Center WinAC Slot 412/WinAC Slot 416 Version 3.1
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Contents
Important Information
1 Product Overview
1.1 What Are WinAC Slot 412 and WinAC Slot 416? 1-2. . . . . . . . . . . . . . . . . . . .
1.2 CPU 41x-2 PCI Is for Controlling Your Process 1-5. . . . . . . . . . . . . . . . . . . . . .
1.3 The PS Extension Board Makes You Independent of a PC 1-6. . . . . . . . . . . .
1.4 Communication Options with CPU 41x-2 PCI 1-7. . . . . . . . . . . . . . . . . . . . . . .
1.5 Router for Communications of CPU 41x-2 PCI 1-9. . . . . . . . . . . . . . . . . . . . . .
1.6 Time Synchronization (PLCTimeSync) 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.7 SIMATIC Computing Creates Access to Process Data 1-11. . . . . . . . . . . . . . . .
1.8 Tag Files Allow You to Use Symbols for Process Data... 1-12. . . . . . . . . . . . . .
1.9 Tag Files Allow You to Access Multiple Control Engines... 1-13. . . . . . . . . . . . .
1.10 Use SIMATIC Computing across a DCOM Network 1-14. . . . . . . . . . . . . . . . . .
1.11 Using OPC to Connect Third-Party Applications to
SIMATIC Computing 1-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.12 The WinAC Tool Manager Provides Shortcuts to Your Programs 1-16. . . . . . .
2 Installing WinAC Slot 41x
2.1 Overview of the Installation 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Installing and Uninstalling the WinAC Slot 41x Software 2-3. . . . . . . . . . . . . .
3 Getting Started
3.1 The Task: Communications Via the Router 3-2. . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.1 Creating a Project 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.2 Configuring the Access Point 3-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.3 Starting the Router 3-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.4 Communications 3-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Using the Tool Manager
4.1 Creating a Toolbar for Easy Access to Your Programs 4-2. . . . . . . . . . . . . . . .
4.2 Using the WinAC Tool Manager without a Mouse 4-4. . . . . . . . . . . . . . . . . . . .
4.3 Changing the Language 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A Distributed Component Object Model (DCOM)
A.1 Using DCOM to Expand the Capabilities of WinAC A-2. . . . . . . . . . . . . . . . . . .
A.2 Connecting to a Specific Control Engine Using DCOM A-4. . . . . . . . . . . . . . . .

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viii Windows Automation Center WinAC Slot 412/WinAC Slot 416 Version 3.1
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B OLE for Process Control (OPC)
B.1 Using OPC with SIMATIC Computing B-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Index
Figures
1-1 Control Panel 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 Using the CPU 41x-2 PCI in WinAC Slot 41x 1-5. . . . . . . . . . . . . . . . . . . . . . . .
1-3 PS Extension Board 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4 Communication Options with the CPU 41x-2 PCI 1-7. . . . . . . . . . . . . . . . . . . .
1-5 Communication via the Router 1-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-6 Clock synchronization 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-7 Accessing the Process Data with SIMATIC Computing 1-11. . . . . . . . . . . . . . .
1-8 Using STEP 7 Symbols to Access Data in the Control Engine 1-12. . . . . . . . .
1-9 Using a Tag File to Access Data from Several Control Engines 1-13. . . . . . . .
1-10 Connecting WinAC on Several Computers across a DCOM Network 1-14. . .
1-11 Using OPC to Connect Third-Party Applications to
SIMATIC Computing 1-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-12 WinAC Tool Manager and Shortcut Icon 1-16. . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1 Installing the Components of WinAC Slot 41x 2-2. . . . . . . . . . . . . . . . . . . . . . .
3-1 Communication via the Router 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 Creating a Project 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3 Selecting a Mounting Rack 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-4 Assigning a CP 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-5 Configuring the Hardware of the S7-400 Station 3-6. . . . . . . . . . . . . . . . . . . . .
3-6 MPI Connection 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-7 Bus Connection 3-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-8 Creating a Connection 3-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-9 Connection Properties 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-10 Setting the PG/PC Interface 3-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-11 Setting the CP Properties 3-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1 WinAC Tool Manager 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2 Inserting Icons into the WinAC Tool Manager 4-3. . . . . . . . . . . . . . . . . . . . . . . .
4-3 Changing the Language for WinAC 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-1 Using WinAC Components with DCOM on a Standalone Computer A-2. . . .
A-2 Using WinAC on Several Computers with DCOM A-3. . . . . . . . . . . . . . . . . . . .
A-3 Connecting to a Specific Control Engine over DCOM A-4. . . . . . . . . . . . . . . . .
B-1 Applications Working with Many OPC Servers B-2. . . . . . . . . . . . . . . . . . . . . . .
B-2 Using the WinAC OPC Server to Access Your Process Data B-2. . . . . . . . . .
Tables
4-1 Keyboard Operations for the WinAC Tool Manager 4-5. . . . . . . . . . . . . . . . . .

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Product Overview
Overview
The WinAC Slot 41x package consists of the following components:
the Slot PLC “CPU 412-2 PCI” or “CPU 416-2 PCI”, two CPUs from the range
of products for the S7-400 for PC-based applications.
the optional PS extension board (PS: power supply; power supply module) for
PC-independent power supply.
the control panel that displays the controls of the CPU 41x-2 PCI on a screen.
the router for the communications of the CPU 41x-2 PCI via a
SIMATIC NET CP (Industrial Ethernet or PROFIBUS) or a network card.
the time synchronization for synchronization of the CPU 41x-2 PCI via a
SIMATIC NET CP (Industrial Ethernet or PROFIBUS).
the SIMATIC Computing software. The SIMATIC Computing software provides
ActiveX controls, which you can use specifically to visualize your process. In
SIMATIC Computing, you can use third-party ActiveX controls in addition to S7
Controls to monitor and modify process data.
Furthermore, SIMATIC Computing has an OPC server (OPC = OLE for
Process Control) which other OPC applications use to access the data in the
controlled device.
WinAC Tool Manager for working with your applications. It is a toolbar that lets
you arrange all the applications you want to use while working with your
process data.
1

Product Overview
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In this chapter
Section Contents Page
1.1 What Are WinAC Slot 412 and WinAC Slot 416? 1-2
1.2 CPU 41x-2 PCI Is for Controlling Your Process 1-5
1.3 The PS Extension Board Makes You Independent of a PC 1-6
1.4 Communication Options with CPU 41x-2 PCI 1-7
1.5 Router for Communications of CPU 41x-2 PCI 1-9
1.6 Time Synchronization (PLCTimeSync) 1-10
1.7 SIMATIC Computing Creates Access to Process Data 1-11
1.8 Tag Files Allow You To Use Symbols for Process Data 1-12
1.9 Tag Files Allow You to Access Multiple Control Engines... 1-13
1.10 Use SIMATIC Computing across a DCOM Network 1-14
1.11 Using OPC to Connect Third-Party Applications to SIMATIC
Computing 1-15
1.12 Tool Manager Provides Shortcuts to Your Programs 1-16
1.1 What Are WinAC Slot 412 and WinAC Slot 416?
PC-based control with WinAC Slot 412/WinAC Slot 416
In the top range of the PLC applications, the number of PC tasks such as data
processing and visualization is increasing. The use of PC-based control (= use of a
PC with an integrated PLC) is then frequently the solution to be preferred
compared to the use of a standard PLC with a PC link for communications.
PC-based control is the combination of a PLC and data processing on a PC with
WinAC Slot 412/WinAC Slot 416.
WinAC Slot 412/WinAC Slot 416 combines the automation tasks of open-loop and
closed-loop control, data processing, communications and visualization on a PC.
WinAC Slot 412/WinAC Slot 416 is based on the original Windows NT and uses
standard interfaces for integration into the Office world. WinAC stands for
Windows Automation Center.

Product Overview
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WinAC Controlling with CPU 41x-2 PCI
WinAC Controlling is the control component with WinAC Slot 412/ WinAC Slot 416.
WinAC Controlling performs the tasks of a conventional programmed logic
controller and is completely integrated in the PC.
WinAC Controlling consists optionally of the CPU 412-2 PCI or CPU 416-2 PCI.
These CPUs exhibit typical PLC features:
warm restart (restart) or precise complete restart as commanded (with
PS extension board)
deterministic behavior with real-time response times
real-time clock
data retentivity using battery backup (with PS extension board)
external load memory for saving the PLC program independently of the PC hard
disk
integrated MPI for connecting a programmer for servicing purposes, for
programming or for networking with other stations
integrated PROFIBUS-DP interface for connecting the I/O
Furthermore, there are interfaces to PC applications.

Product Overview
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Operation
The CPU 41x-2 PCI is operated from control panel that is displayed on the PC
screen. The panel is modeled on the front panel of an S7 CPU and makes
available the functions that it features.
Access to the PLC from the control panel can be protected by a password so that
only authorized persons can modify the settings.
Shows the status of the
CPU 41x-2 PCI.
Resets the memory areas
Sets the operating mode
of the CPU 41x-2 PCI.
Figure 1-1 Control Panel
Programming
Configuration and programming of the CPU 41x-2 PCI is accomplished in a
manner similar to that for the SIMATIC S7 with STEP 7. For these tasks, you can
use the programming languages LAD, CSF, STL, S7-SCL and all graphics
programming languages such as S7-GRAPH, S7-HiGRAPH and CFC.

Product Overview
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1.2 CPU 41x-2 PCI Is for Controlling Your Process
CPU 41x-2 PCI features an effective hardware solution for your automation
projects (refer to Figure 1-2). The I/O is connected via PROFIBUS-DP.
Distributed I/O
CPU 41x-2 PCI
Figure 1-2 Using the CPU 41x-2 PCI in WinAC Slot 41x

Product Overview
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1.3 The PS Extension Board Makes You Independent of a PC
The PS extension board (PS: power supply) is used to supply voltage to the
CPU 41x-2 PCI independently of the PC power supply unit. In this way it is
possible to operate the CPU 41x-2 PCI even when the PC has been powered
down.
By connecting the backup battery, warm restart (restart) and complete restart are
possible for the CPU 41x-2 PCI.
In addition, you can operate the fan in the PC with the PS extension board.
Figure 1-3 PS Extension Board

Product Overview
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1.4 CommunicationOptions with CPU 41x-2 PCI
PC
MPI subnet
Industrial Ethernet / PROFIBUS subnet
MPI PROFIBUS-DP
PC CPU 41x-2 PCI
Router/time syn-
chronization
CP MPI PROFIBUS-DP
PC
CPU 41x-2 PCI
STEP 7
Router/
Clock synchronization
PROFIBUS-DP
PROFIBUS-DP
WinCC
Windows
application
*: transfer via STEP 7/Configure Hardware
CPU 41x-2 PCI
MPI/DP*DP
Communication CP
Industrial Ethernet or
PROFIBUS subnet
OP/OS ET 200M
S7-400
PG/PC
OP/OS ET 200S
PG/PC S7-300
Figure 1-4 Communication Options with the CPU 41x-2 PCI
Figure 1-4 shows the communication options open to you with the CPU 41x-2 PCI.
The CPU 41x-2 PCI has one PROFIBUS-DP interface and one
MPI/PROFIBUS-DP interface.

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If you wish to perform communications via Industrial Ethernet or PROFIBUS
subnet, you must install an additional communication processor (CP) on your PC.
The communication options to other nodes are as follows:
1. Connection to PROFIBUS-DP through the integrated interface.
2. Connection to MPI or PROFIBUS-DP through the second integrated interface.
3. Connection to PC through the PCI interface.
4. Connection to another network such as Industrial Ethernet/PROFIBUS via a
communication processor (CP).
Note
With SIMATIC Manager (STEP 7), which is installed on the same PC as the
CPU 41x-2 PCI, you cannot simultaneously operate the CPU 41x-2 PCI and the
CPUs connected via Industrial Ethernet or PROFIBUS subnet.
You have to assign parameters to the corresponding S7ONLINE access points
(STEP 7) using “Set PG/PC interface”.

Product Overview
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1.5 Router for Communications of CPU 41x-2 PCI
For stations (such as programming device, OP, OS, S7 automation system), which
are connected to a SIMATIC NET (Industrial Ethernet/PROFIBUS (IE/PB)), to be
able to communicate with the CPU 41x-2 PCI, a router has to be installed on the
programming device or PC and the access points configured. Data transfer is
possible in both directions.
Router
PC
Industrial Ethernet (IE)
PROFIBUS-DP (PB)
OP/OS
S7 Station
PG/PC
IE CP or PB CPCPU 41x-2 PCI
Figure 1-5 Communication via the Router

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1.6 Time Synchronization (PLCTimeSync)
The CPU 41x-2 PCI can be synchronized, together with other nodes (for example,
S7 components) with a central time-of-day transmitter.
The time synchronization service in the PC supplies the CPU at intervals with the
current date and time. The time-of-day transmitter furnishes the time of day at
periodic intervals on the Industrial Ethernet or PROFIBUS (IE/PB). Only the ISO
protocol is supported by Industrial Ethernet.
Clock synchronization
PC
Industrial Ethernet (IE)
PROFIBUS-DP (PB)
OP/OS
S7 station
PG/PC
CPU 41x-2 PCI IE CP or PB CP
Time-of-day
transmitter
Figure 1-6 Clock synchronization
Note
The time synchronization facility is only provided for certain communication
processors (CPs). You will find information on this in the Product Information
document.

Product Overview
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1.7 SIMATIC Computing Creates Access to Process Data
In Figure 1-7, you can see how you can use the SIMATIC Computing software to
access the CPU 41x-2 PCI for monitoring and modifying process data.
SIMATIC Computing provides several methods for accessing the process data:
You can use standard ActiveX controls (OCX) to access the process data.
You can use DCOM (Microsoft’s Distributed Component Object Model) to
integrate distributed applications across a network. A distributed application
consists of several processes or different computers that cooperate to jointly
solve a task (refer to section 1.10).
You can use an OPC (OLE for Process Control) server which other OPC clients
use to access the data in the controlled device (refer to section 1.11).
S7SoftContainer - [S7Soft1]

File Edit View Mode Options Window Help
Ready
S7Soft1
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
Design
SIMATIC Computing
File CPU Help
PS
CPU
ON
INTF
EXTF
BUSF1
BUSF2
FRCE
RUN
STOP
RUN
RUN-P
MRES
STOP
OFF
ON
CPU 416-2 PCI
BATF
Figure 1-7 Accessing the Process Data with SIMATIC Computing

Product Overview
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1.8 Tag Files Allow You to Use Symbols for Process Data...
A tag file provides a source of symbolic information for memory locations and
control engines. Linking to a tag file allows you to use symbolic names instead of
absolute addresses when assigning tags in SIMATIC Computing (refer to
Figure 1-8).
The TagFile Configurator creates a tag file that provides a source of symbolic
information for the memory locations and control engines. The tag file can then be
used on a computer on which STEP 7 is not installed.
Refer to the SIMATIC Computing User Manual for detailed information about using
the TagFile Configurator.
SIMATIC Projects
Master_Mixer
@PC_1
WinAC
Mixer
Tag File
Control Engine Symbol STEP7 Path
PC_1_WinAC WinAC\@PC_1\WinAC\Mixer
STEP 7
Computer Name
@PC_1
CPU
41x-2 PCI
Distributed
I/O
The tag file includes the symbol
table and the control engine for the
STEP 7 project
Figure 1-8 Using STEP 7 Symbols to Access Data in the Control Engine