Getting Started with CX-Server OPC

Getting Started with CX-Server OPC
OMRON
Getting Started with CX-Server OPC
CX-Server OPC
User Manual
Getting Started
Version 1.0
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OMRON
Getting Started with CX-Server OPC
Notice
OMRON products are manufactured for use according to proper procedures by a qualified
operator and only for the purposes described in this manual.
The following conventions are used to indicate and classify precautions in this manual. Always
heed the information provided in them. Failure to heed precautions can result in injury to
people or damage to the product.
DANGER!
Indicates information that, if not heeded, is likely to result in loss of life
or serious injury.
WARNING
Indicates information that, if not heeded, could possibly result in loss
of life or serious injury.
Caution
Indicates information that, if not heeded, could result in relatively
serious or minor injury, damage to the product, or faulty operation.
OMRON Product References
All OMRON products are capitalised in this manual. The word “Unit” is also capitalised when
it refers to an OMRON product, regardless of whether or not it appears in the proper name of
the product.
The abbreviation “PLC” means Programmable Logic Controller and is not used as an
abbreviation for anything else.
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Visual Aids
The following headings appear in the left column of the manual to help you locate different
types of information.
Note:
1, 2, 3…
Indicates information of particular interest for efficient and convenient operation
of the product.
Indicates lists of one sort or another, such as procedures, checklists etc.
Represents a shortcut on the Toolbar to one of the options available on the menu of
the same window.
Indicates a program must be started, usually by clicking the appropriate option under
the standard Windows ‘Start’ button.
Note:
Indicates procedures that are specific to Visual Basic.
 OMRON, 2000
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system,
or transmitted, in any form, or by any means, mechanical, electronic, photocopying, recording,
or otherwise, without the prior written permission of OMRON.
All copyright and trademarks acknowledged.
No patent liability is assumed with respect to the use of the information contained herein.
Moreover, because OMRON is constantly striving to improve its high-quality products, the
information contained in this manual is subject to change without notice. Every precaution has
been taken in the preparation of this manual. Nevertheless, OMRON assumes no responsibility
for errors or omissions. Neither is any liability assumed for damages resulting from the use of
the information contained in this publication.
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Getting Started with CX-Server OPC
About this Manual
This manual describes the CX-Server OPC application and its ability to interface with OMRON
CS, CV and C PLCs. It does not provide detailed information concerning the PLCs themselves,
for this information the commercial manual for the device must be consulted.
This manual contains the following information:
•
Getting Started with CX-Server OPC: This describes the CX-Server OPC software in
general terms.
•
Using the OPC Server: This describes running and setting up the OPC Server for use by
any OPC Client.
•
Using Omron OPC Client Components: This describes using the supplied ActiveX
components to access PLC data and includes a tutorial for Excel and Visual Basic host
applications.
•
Appendix A Component Properties: This appendix summerises the available properties
for the ActiveX objects.
•
Appendix B Script Interface: The Visual Basic script interface for the OPC Server
communications control.
A Glossary of Terms and Index are also provided.
Warning:
Failure to read and understand the information provided in this
manual may result in personal injury or death, damage to the
product, or product failure. Please read each chapter in its
entirety and be sure you understand the information provided in
the chapter and related chapters before attempting any of the
procedures or operations given.
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Getting Started with CX-Server OPC
Table of Contents
CX-Server OPC
Page
Getting Started with CX-Server OPC ............................................... 6
About this Manual ........................................................................................................................6
System Requirements..................................................................................................................7
Installing CX-Server Lite ..............................................................................................................8
The Help System, and How to Access it ......................................................................................8
Technical Support ........................................................................................................................9
Using the OPC Server ....................................................................... 10
What is OPC? ............................................................................................................................10
Starting CX OPC Server ............................................................................................................10
Using with Third Party OPC Clients ...........................................................................................11
Configuring the PC for remote connection .................................................................................12
Using the OPC Client Components.................................................. 14
Objects Overview .......................................................................................................................14
Using the OPC Server................................................................................................................15
Step 1: Viewing PLC data using Omron Graphical Controls ......................................................15
Step 2: Inserting PLC data in Cells ............................................................................................18
Step 3: Adding Third Party Controls...........................................................................................18
Other Features ...........................................................................................................................19
Appendix A – Component Properties.............................................. 23
Appendix B – Script Interface.......................................................... 26
Functions ...................................................................................................................................26
Glossary of Terms.............................................................................. 29
Index.................................................................................................... 31
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Getting Started with CX-Server OPC
Getting Started with CX-Server OPC
This book introduces the CX-Server OPC application to a new user.
CX-Server OPC allows PLC data collected by CX-Server to be accessed by standard OPC
clients. It allows existing process data to be collected and analysed, plus it includes graphical
components allowing easy creation of simple SCADA applications.
Included with CX-Server OPC is the CX-Server Runtime, plus a range of ActiveX components
that can be dragged and dropped onto your Excel Workbook or Visual Basic Form.
About this Manual
This manual helps a new user get started with CX-Server OPC, by describing the software
installation and computer configuration, and by leading the user through the basics of CXServer OPC.
Separate OMRON manuals describe the related products; CX-Server, CX-Programmer and
SYSMAC-SCS.
Small example applications are included to demonstrate the basic features of the product.
These can be used to help with product familiarity.
CX-Server OPC comes with a comprehensive on-line help system, which is designed to
complement this manual, and provide a quick reference at any point in the CX-Server OPC
application when the manual is not to hand. This general help system uses a fast 'hypertext'
system that allows progressively more information to be obtained about any topic by selecting
keywords within the descriptive text.
Throughout this manual, it is assumed that a working knowledge of Microsoft Windows is
obtained, and that the user can:
♦ Use the keyboard and mouse.
♦ Select options from Windows menus.
♦ Operate dialog boxes.
♦ Locate, open and save data files.
♦ Edit, cut and paste text.
♦ Drag and drop.
♦ Use standard Help systems including Index and Find features.
♦ Start programs from the “START” button.
If Windows has not been used before, it is recommended that some time working with the
Microsoft documentation is spent before using CX-Server OPC.
This introductory section deals with several important aspects of installing CX-Server OPC and
setting it up for use. It is recommended that this entire section be read before installing the
software.
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System Requirements
CX-Server OPC operates on IBM compatible personal computers with 200 MHz Pentium
central processor. It is designed to run in the Microsoft Windows 95 / 98 and Windows NT V4.0
environment.
Note:
CX-Server OPC is not guaranteed to be compatible with computers running
Windows emulation (e.g. Apple Macintosh).
Hardware Requirements
The following configuration is the minimum system requirements for running CX-Server OPC
IBM PC compatible 200 MHz Pentium processor:
♦
64 Mbytes of RAM,
♦
30 Mbytes available hard disk space,
♦ 800 x 600 Super VGA display.
The Recommended minimum is:
♦
IBM PC compatible 400 MHz Pentium II processor,
♦
64 Mbytes of RAM,
♦
50 Mbytes available hard disk space,
♦
1024 x 768 Super VGA display.
Operating Systems and Environments
The operating systems on which this software will run are:
♦
Microsoft Windows 95 / 98,
♦ Microsoft Windows NT 4.0 (Service Pack 4 and later),
Containers in which this software will run are:
♦
Microsoft Excel 97 and later,
♦
Microsoft Visual Basic version 5.0 and later.
Interfaces to Hardware - PLC Communications
Interfaces to PLC hardware are via the CX-Server runtime system. Note that Temperature
Controllers are not supported in this version.
Interfaces to Network Service Boards (NSBs) are achieved using Fins Gateway, which is
supplied and supported as part of the CX-Server product.
Interfaces to Hardware - Peripherals
Interfaces to PC hardware (printers, graphics, keyboard, mouse, Ethernet etc) are supported
by drivers installed and supported by Windows.
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Installing/Uninstalling CX-Server OPC
The CX-Server OPC software is supplied on CD-ROM and is installed easily from within
Windows.
To install CX-Server OPC
1, 2, 3… 1. Close all programs.
2. Insert the CD labelled CX-Server OPC into your CD-ROM drive. If Autorun
is enabled on your system, the installation starts automatically, otherwise
see the README.TXT on the CD-ROM for instructions to launch manually
3. Follow the instructions on the screen.
By default, CX-Server OPC is installed in C:\Program Files\Omron. Additional
Omron applications will be installed in a subfolder under Omron. Common
components
are
installed
into
C:\Program
Files\Common
Files\Omron\Components
To uninstall CX-Server OPC
When you uninstall, your CX-Server OPC project data remains intact – uninstall only removes
program files. It is recommended, however, that you copy and move any projects you saved
in the CX-Server OPC folder. Save a copy of your projects in another location on your hard
drive (such as your My Documents folder) before uninstalling CX-Server OPC.
1, 2, 3…
1.
2.
3.
4.
5.
6
7
From the Start menu, select Settings – Control Panel.
Double-click the Add/Remove Programs.
Click the Install/Uninstall tab.
From the list programs that you can remove, select CX-Server OPC.
Click Add/Remove.
At the prompt, select the Remove item and click Next and follow any further
prompts
Wait until the uninstall program indicates that the process is complete.
The Help system, and How to Access it
CX-Server OPC comes with a detailed help system. At any time while using the software, it is
possible to get help on a particular point that is currently being worked on, or on general
aspects of CX-Server OPC. This system is intended to complement the manual, by providing
on-line reference to specific functions of the software and how to use them. The manual is
designed to provide tutorial information and discuss the various facilities offered by CX-Server
OPC.
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Help Topics
The help can be launched in several ways. The Contents page can be launched by
selecting Help from the CX-Server OPC folder on the Start button. Alternatively, if the
server is running right click the CX logo in the system tray and select Help… from the menu.
The help system provides a standard look-up dialog under the Contents tab showing the
contents of the CX-Server OPC Help file. Double-click on an item to read the associated
information.
Refer to Microsoft Windows documentation for further information on using the Index and Find
features.
About CX-Server OPC
The OPC Server menu includes an About dialog contains essential version number information
and includes details of the version of CX-Server installed that are required for obtaining
technical support. The CX-Server ActiveX Components also include an About dialog containing
essential version number information, which is accessible from their properties menu.
In addition, a brief description of CX-Server OPC and the CX-Automation Suite can be
accessed from the main help contents dialog.
Technical Support
If the installation instructions for this application have been followed, no difficulties should be
encountered.
If a problem occurs, check that it does not relate to a fault outside CX-Server OPC, for instance,
with external components. Check the following:
♦ The PC is working correctly,
♦ The external system or application is working correctly,
♦ The communications system is set up correctly,
♦ Any errors are cleared in the associated PLCs.
When Customer Services need to be contacted, keep the following details to hand. A clear and
concise description of the problem is required, together with the exact text of any error
messages.
Note:
Use the About dialog to obtain the version number of the application.
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Using the OPC Server
This section introduces the OPC Server application to a new user.
What is OPC?
OPC stands for OLE for Process Control, and is a standard published by the OPC
Foundation. The basic aim of the OPC standard is to allow hardware vendors to produce
software drivers (called OPC Servers) and for software vendors to produce applications (called
OPC Clients) which use a standard method for data interchange. This allows software and
hardware from different vendors to be used together.
The latest version of the OPC standard is version 2. This replaces the earlier version 1
standard.
CX-Server OPC provides an OPC version 2 server by adding an OPC version 2 interface to the
CX-Server runtime used for communication to Omron PLCs. Note that the OPC version 1
interface has been superseded, and is not supported.
Users of CX-Server OPC, who have existing OPC clients or intend to use the OPC client
functionality included may need some basic understanding of OPC. OPC client developers will
need a complete understanding of OPC, and the interfaces defined. For more information on
OPC, see the OPC Foundation web site at www.opcfoundation.org.
Starting CX OPC Server
To launch the OPC Server:
1, 2, 3…
1.
2.
3.
From the Start button, select OPC Server from the section Programs,
Omron, CX-Server OPC.
The server will start. Note the CX logo in the system tray:
Configure the server namespace by clicking the CX logo with the right
mouse button and selecting Select CX-Server Project from the popup
menu.
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i. To open an existing CX-Server Project (.CDM) file:
♦
Click the Open… button and in the Open Project dialog
navigate to the file you wish to open.
♦
When you click the Open button, the full path name of the
selected file will be entered into the Project field.
Caution: When sharing a CDM file with other applications it is important
to realise that any changes that are made to the CDM file may
affect the other applications.
ii. To create a new CX-Server Project (.CDM) file:
♦
Click the New… button and in the Create Project dialog
navigate to the directory in which you wish to create the new
file.
♦
In the File Name field, enter the new file name. When you click
the Save button, the full path name of the new file will be
entered into the Project field.
Click the OK button.
4. Projects can be edited by clicking the Edit Project… button and then
making the required changes from the Project Editor Dialog. This is a
CX-Server runtime utility – invoke help from within it for details of how to
add and configure PLCs and Points.
5. Click the OK button to complete the configuration.
The OPC Server is now ready for use by any OPC Client that is compliant with OPC Data
Access version 2.
The CX-Server project file cannot be changed while clients are connected. To select a different
CX-Server project file at a later date, either start the OPC Server manually from the Start button
or if the server is running, select Disconnect Clients and then follow steps 3-5 of the above
procedure.
Tip: You can make the OPC Server start automatically when the PC starts, by copying the
shortcut on the Start button in the CX-Server OPC folder to the Startup folder.
Using with Third Party OPC Clients
The exact procedure for connecting Third Party OPC Clients to the OPC Server will depend on
the client being used. Consult your OPC Client documentation for full details. However, the
following is a basic overview:
1, 2, 3…
1.
Start and configure the OPC Server as described above.
2.
Start the OPC Client.
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3.
4.
5.
Depending on the client, either browse for local OPC servers and select
OMRON.OpenDataServer.1 or type the name directly.
Note: If the client supports browsing for servers, but the server is not
shown, the client may not be fully OPC version 2 compliant.
Create an OPC Group from the client.
Create an OPC Item from the client. If the client supports OPC item
browsing facilities, browse the OPC Server to list the namespace groups
and items to create the OPC Item ID. Otherwise, type the CX-Server
logical name as the OPC Item ID.
Configuring the PC for remote connection
The OPC interface uses a Microsoft technology called DCOM. This allows the OPC client and
OPC server to be seamlessly ‘Distributed’ over a PC network. The OPC Server should be
running on the PC with direct connection to the PLC or PLC network. However, the OPC Client,
or indeed multiple OPC Clients, can be run on different networked PCs and will automatically
read and write data over the PC network. To do this, the PC running the OPC Server must be
correctly configured. For full details of DCOM configuration and security issues see your
Microsoft documentation. The following is a quick guide:
Configuring a machine running Windows NT
1, 2, 3…
1. Start DCOMCNFG.EXE e.g. by selecting RUN from the Start button. The
default location is C:\WINDOWS\SYSTEM.
2. View the Default Properties tab. Ensure that the Enable Distributed
COM on this computer is checked.
3. From the Default Properties tab, configure the Default Authentication
Level to Connect and the Default Impersonation Level to Identify.
Setup the access permissions by either:
a) On the Default Security tab, adding the user to the Access, Launch
and Configuration lists by clicking the Edit Default… button in each
case.
b) From the Applications tab, configure the properties for
OpenDataServer and OpcEnum. On the Security tab, add the
required users to each of the Custom Permissions.
Configuring a machine running Windows 98 or Windows 95
1, 2, 3…
1. Ensure File and Printer sharing is enabled by selecting Network from the
Control Panel. Add a service and click either “File and print sharing for
Microsoft Networks” or “File and print sharing for Netware Networks” as
appropriate.
2. Start DCOMCNFG.EXE e.g. by selecting RUN from the Start button. The
default location is C:\WINDOWS\SYSTEM.
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3. View the Default Properties tab. Ensure that the Enable Distributed
COM on this computer is checked.
4. View the Default Security tab and check the Enable remote connection
check box.
5. From the Default Properties tab, configure the Default Authentication
Level to Connect and the Default Impersonation Level to Identify.
Setup the access permissions by either:
a) On the Default Security tab, adding the user to the Access list by
clicking the Edit Default… button.
b) From the Applications tab, configure the properties for OPC Server
and OPC ServerList Class. On the Security tab, add the required
users to each of the Custom Permissions.
Third party servers and clients running on Windows 95 or Windows 98, also require the
Microsoft Remote Registry network service to be installed with the operating system and
correctly configured on both the server and client machine. To check: start the Control Panel
and view the Network settings. In the list of network components, look for Microsoft Remote
Registry. If it does not exist, follow these steps to add it.
1, 2, 3…
1. In the Network settings, ensure User-level access control is selected on
the Access Control tab.
2. From the Configuration tab, click Add to add a Network component.
Choose Service from the type list and click Add.
3. Click Have Disk… and browse your Windows CD. Select the path
\Tools\ResKit\NetAdmin\RemotReg and select regsvr.inf.
4. Follow screen prompts to complete installation and reboot if necessary.
5. On the server machine, select Passwords from the Control Panel.
6. Ensure the Enable remote administration of this server option is
checked.
7. Add all required user ids to the Administrators list by clicking Add….
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Using the OPC Client Components
CX-Server OPC also includes an OPC Client, called Omron OPC Communications
Component and graphical controls that link directly to the communications component. These
are all ActiveX controls allowing data to easily be collected and displayed in either Excel or
Visual Basic. The graphical controls and communication component can of course be used
with any version 2 OPC Server.
Objects Overview
OPC Communications Control
This control provides a seamless interface between the CX-Server OPC host application (Excel,
Visual Basic) and any version 2 compliant OPC Server. Note that the control is only visible
when the host application is in the Design mode.
7 Segment
The 7 segment displays a numerical value in Binary, Decimal or Hexadecimal formats. Leading
zeros and unused segments hidden. The colour of the segments and the display background
can be set independently. The 7 Segment can not be used to set a value.
Display
The Display displays an analogue or text value. The Display only displays a value i.e. you can
not set a value using this display.
LED Indicator
The LED functions as a coloured on/off indicator. The colour of the indicator and the display
background can be set independently while its shape can be round or square. In the off state,
the chosen indicator colour is dimmed.
Linear Gauge
The Linear Gauge displays an analogue value by filling a rectangle to represent the actual
value as a proportion of its expected maximum. The rectangle can be filled from bottom to top
(like a thermometer) or from left to right (like a progress complete bar). There is also a
configurable scale, enabling intermediate values to be estimated. The Linear gauge will only
display a value, you can not set a value with this gauge.
Rotational Gauge
The Rotational Gauge displays an analogue value, similar to a speedometer. An indicator
needle rotates according to the value. There is a configurable scale, enabling intermediate
values to be estimated. The Rotational gauge will only displays a value, you can not set a
value with this gauge.
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Rotary Knob
The Rotary Knob allows the you to set an analogue value, similar to a volume knob. You can
rotate the knob, e.g. by clicking and dragging the mouse, to set the pointer to a new position.
There is a configurable scale, enabling intermediate values to be estimated. The pointer
always reflects the current value e.g. on start-up, and will change position in response to an
external influence.
Toggle
The Toggle allows you to toggle a Boolean bit between its ‘On’ and ‘Off’ state. This is as a
switch that can be clicked to change its state. The current state is shown by the position of the
switch. The switch position also reflects the current value e.g. on start-up, and will change
position in response to an external influence.
Timer
The timer enables you to run a set of instructions repeatedly at regular intervals.
Using the OPC Server
The following sections take you through the steps required to open your selected application,
i.e. Excel or Visual Basic and create a working area. Using the short tutorial you can then
continue and load a number of ActiveX objects, link them together and run a simulation.
As you became more practised in using CX-Server OPC you will find there is usually more then
one way to perform an operation. The following procedures may not always the quickest but
have been written to show how the application works using the basic features.
If the ActiveX objects are not visible in the Visual Basic Toolbox they can be added as follows:
1, 2, 3…
1. Right click in the Toolbox and select the Components… option. This will
open the Components dialog.
2. Find the CX-Server OPC controls in the list, all of which all start with
OMRON CX, and tick each box.
3. Click the OK button. The objects are now displayed in the Toolbox.
Step 1: Viewing Data using Omron Graphical Controls
Adding the Communications Control
Before the Graphical Controls objects of CX-Server OPC can communicate with an OPC
Server, the correct data source connections have to be set up for it. This is not necessary if the
Graphical Control will be used stand alone and driven from script.
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To add a Communications Control:
1, 2, 3…
1.
2.
3.
4.
5.
Start the host application e.g. Microsoft Excel 97.
Tip: If you intend having a large number of components on your
desktop it is recommended you run Excel in full screen mode.
Ensure the Control Toolbox and CX-Server OPC toolbars are shown
by selecting them from the View, Toolbar menu.
Note: In Visual Basic, ensure the Toolbox is shown by selecting
Toolbox from the View menu.
Ensure the host application is in design mode for example, in Excel by
clicking the Design Mode button in the Control Toolbox.
In the CX-Server OPC toolbar click the Add OPC Communications
Control button. The Communications Control object is drawn in the
default position - top left hand corner of the work area.
Note: In Visual Basic, select the required component from the
Toolbox and draw a rectangle at the desired position.
Tip: Double clicking the toolbox button inserts the component
with a default size.
Using Drag and Drop the object can now be repositioned in the work
area. Note that the object will not visible in run mode.
Connecting the Communications Control to an OPC Server
The first step is to create a project file (.OPC file) or select one which has been previously
created. This file contains configuration data and symbolic definitions for the desired OPC
items
The following procedure takes you through the steps required to load an existing .OPC file or
create a new one.
1, 2, 3…
1. Right click on the OPC communications control. In the popup menu, select
the OMRON CX OPC Communications Control Object option.
Note:
In Visual Basic, the menu option is called Properties.
2. In the Communication Control Properties dialog select the Project file:
i.
To open an existing project (.OPC) file:
♦
Click the Open… button and in the Open Project dialog navigate
to the file you wish to open.
♦
When you click the Open button, the full path name of the
selected file will be entered into the Project field.
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ii.
To create a new project (.OPC) file:
♦
Click the New… button and in the Create Project dialog navigate
to the directory in which you wish to create the new file.
♦
3.
4.
5.
6.
7.
In the File Name field, enter the desired file name. When you
click the Save button, the full path name of the new file will be
entered into the Project field.
By default, the Computer Name field shows the name of the local computer.
If the OPC Server is on a remote machine, click Show All. This may take
a few moments, depending on your network and operating system. When
complete the Computer Name list now shows all computer names. Select
the required computer, and wait while connection is tested.
The Server name list shows all the OPC version 2 compliant servers
registered on the computer listed in Computer Name field. For the server
included with CX-Server OPC select Omron.OpenDataServer.1 from the
list. The connection can be tested by clicking the Info… button that will
display standard OPC status information collected from the OPC server.
At least one OPC client Groups must now be defined using the Groups tab.
Choose any meaningful name.
Add an Item for the data to display using the Items tab. Choose any
meaningful name e.g. OPCBoilerTemp. Type the Item ID of the item as
defined by the OPC Server or use the Browse… button if the server
supports the optional ‘Browse items’ interface. For the server included with
CX-Server OPC the Item ID is same as the CX-Server Point Name e.g.
“BoilerTemp”.
Click the OK button to complete the configuration.
The communications control is now ready to connect to the OPC Server, and retrieve data.
This data can be accessed using script commands (see Appendix B), or by adding a Graphical
Component.
Adding a 7 Segment Display
1, 2, 3…
1. With the host application in design mode, add a 7 Segment control.
2. Right click on the graphical component and from the popup menu select the
OMRON CX 7 Segment Control Object option.
Note: In Visual Basic, the menu option is called Properties.
3. In the component properties dialog select the Data Source tab and enter
the following information:
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♦
Server: - Select the name of the communications control to be used.
If only one has been added, it is selected automatically. If the list is
empty then you need to add one first.
♦ Group: - Select the required group. If the appropriate group is not in
the list click the > button and select Add Group….
♦ Item: - Select the point Item. If the appropriate Item is not in the list
click the > button and select Add Item….
4. Click OK to complete the connection.
Running the Application
Click the Mode button to change to ‘Run’ mode. The communications control
will disappear and will connect to the server. Once connected, the 7 Segment
display will show the current value.
Note: In Visual Basic, click
to switch to run mode, and
to return
to design mode.
Step 2: Inserting Data in Cells
Step 1 shows data in a graphical control, but the data can also be inserted directly into cells
within Excel. This could be useful for further numerical analysis, like averaging or statistical
control.
Note
:
In Visual Basic, there is no concept of cells, but the same technique could be used
to set a Visual Basic variable.
Assuming Step 1 above has been completed:
1, 2, 3…
1. Decide when the data should be updated:
i. For the user to control the data update, add a standard Command
Button from the Control Toolbox.
ii.
For the value to constantly update on a regular interval, add the
Omron timer control.
2. Double click the added object to access the script and add the line:
Cells(1, 1) = OPCComms1.Value(“GroupName”,
"OPCBoilerTemp")
where OPCBoilerTemp is the name of the item to read.
3. Close the Visual Basic editor, and run the application as shown in Step
1. The cell A1 (that is row 1, column 1) will show the required data.
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Step 3: Adding Third Party ActiveX Controls
Step 1 shows data in an Omron graphical control, but the data can used by other ActiveX
controls, like Graphical Control Libraries supplied by other manufacturers, or controls like
Charts or Scroll Bars supplied with Microsoft products.
Assuming Step 1 above has been completed, the following steps show connecting the data to
a standard Scroll Bar:
1, 2, 3…
1. Add a standard Scroll Bar from the Control Toolbox.
2. Select and resize the buttons as required then drag and drop the buttons
in the desired position.
3. Double- click on the scroll bar buttons. This will reposition the cursor in the
code sheet at the following entry.
Private Sub Scrollbar1_Change()
|
End Sub
Note:
In Visual Basic, the default name for scroll bars is HScroll1 or
VScroll1.
4. Add the following syntax. The additional command instructs any new Scroll
Bar value to be written to the server.
Private Sub Scrollbar1_Change()
OPCComms1.Value(“GroupName”, “OPCBoilerTemp”) =
Scrollbar1.Value
End Sub
Run the application as shown in Step 1. The communications control will
disappear and the 7 Segment display will show the current value. When you
click on the scroll bar buttons the value is sent to the server. This new value
is then shown on the 7 segment display. Note that the maximum value is
limited to 100. This is the default value of the scroll bar buttons.
This example shows a control setting a value. Third Party controls can also display values. For
this, the syntax would be (depending on actual control):
ControlName.Value = OPCComms1.Value(“GroupName”, “OPCBoilerTemp”)
This script could also be added to a button or Timer control, as explained in Step 2. Script
functions are described further in Appendix B.
Other Features
The following sections provide a brief overview of some of the more advanced features
available in CX-Server OPC.
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Event Driven Routines
Many of the script examples in this manual use asynchronous communications, that is
communications are carried out on demand without synchronisation with the rest of the system.
Asynchronous communications can be easily used to quickly create solutions that are easy to
understand. As a solution grows however, asynchronous communications can prove inefficient
and produce unpredictable updating, which is difficult to debug because multiple scripts may
be demanding the same data at the same time.
The OPC Communications Control provides facilities for synchronous communications, that is
communications and data updating are synchronised. The GetData and StopData script
commands (see Appendix B for full details) control the generation of OnData events on regular
intervals, which can be used to efficiently drive multiple controls, and is easier to debug.
Example:
1, 2, 3…
1. Add an OMRON CX OPC Communications Control and two standard
Command Buttons.
2. Double click the communications control to add the following script.
Note the script is in the Event OnData:
Private Sub OPCComms1_OnData(ByVal Group As String,
ByVal Item As String, ByVal Value As Variant, ByVal
BadQuality As Boolean)
If (Item = "OPCBoilerTemp") Then
'Data is from this point
Cells(1, 1) = Value
End If
End Sub
Every time OnData is called with data from the point OPCBoilerTemp
the value is written to the cell A1.
3. Double click the Command Buttons to add the following script:
Private Sub CommandButton1_Click()
OPCComms1.GetData "MyGroup", "OPCBoilerTemp"
End Sub
Private Sub CommandButton2_Click()
OPCComms1.StopData "MyGroup", "OPCBoilerTemp”
End Sub
Run the application. Click CommandButton1 to start creating OnData events every second.
Note the cell A1 updating. Click CommandButton2 to stop the updating.
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Advanced Properties
When working with Visual Basic the advanced properties dialog is normally displayed on the
right of the work form, although it can be docked in any position. In Excel it is opened by right
clicking on an object and selecting the Properties option from the pop up menu. The dialog
allows you to scan through all the available options. Some options require you to enter specific
information, others provide a choice of entries from a drop down menu.
From the drop down menu at the top of the dialog select the objet to be edited. This will display
the full range of options available for that object, which can then be viewed either Alphabetically
or Categorised. A full list of the options and their settings and ranges for the CX-Server OPC
objects can be found in Appendix A – Component Properties.
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Project Tree
Like Explorer the Project Tree provides a graphical representation of you application. In Visual
Basic it is displayed to the right of the work form while in Excel it is shown on the left of the code
sheet.
By expanding the tree you can see all your associated files and work sheets. It is possible to
open any number of work sheets by simply double- clicking on them. Having multiple work
sheets open in this way enables you to copy and paste between them saving you valuable time
rewriting sections of code that already exist, and more importantly are known to work.
Controlling ActiveX Objects
A number of objects can be grouped together such as the 7 segment display and the spin
buttons by selecting the objects you want to group while holding down the ‘Shift’ key as you
select each object. When you have selected all the objects, right click on an object and select
the ‘Group’ option from the drop down menu. Note however that objects must be ungrouped
before their parameters can be edited.
Other drawing commands such as Bring to Front, Send to Back, Cut, Copy, Past etc. follow the
standard windows conventions and are selected from the toolbar and/or drop down menus.
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Appendix A
Component Properties
This appendix gives a list of the available properties. Each component supports a selection of
these properties which can be set in design mode by using the properties dialog, or in the run
time by using a Visual Basic script command – for example: - Object1.Value = 10
Property Title
Example Values
Description
About
None
Description of the object.
(Custom)
None
Opens the properties dialog for the object.
(Name)
Object Name
This is the system generated name for the object.
Autoload
True
False
Switches the Autoload function On or Off. When set to On the ActiveX
component value will autoload.
True = On, False = Off.
AutoSize
0 to 1
Switches the fonts auto size option on or off.
0 = Off, 1 = On.
BackColour
&H00E0E0E0&
The code determines the background colour of the object. Click the browse
button to display the colour palette.
BorderStyle
0 to 3
The value determines the visual appearance of the border that surrounds the
object.
0 = None, 1 = Raised, 2 = Sunken, 3 = Single_Line
ButtonStyle
0 to 6
The value determines the button style.
0 = Toggle Switch, 1 = Colour Button, 2 = In/Out Button, 3 – Rotary Switch
4 = Rocker Switch, 5 = Indicator Button, 6 = Blank Button.
CommsServerName
Comms1 to n
This is the name of associated communications control.
DecimalPlaces
2
Number of decimal places for 7 Segment. Only applies when NumberBase =
10
DisplayFont
Arial
This is the system name of the font used for the display. Use the browse
button to display the font dialog. Arial is the default.
DisplayFontColour
&H00000000&
The code determines the colour of the display font. Click the browse button
to display the colour palette.
DisplayFormat
0 – Dec
1 – Hex
2 – Scientific
Determines the format used to display the analogue display information.
0 = Decimal, 1 = Hexadecimal, 2 = Scientific.
DisplayMajorTicks
False
True
Shows or hides the major tick marks of the scale.
True = Show, - False = Hide.
DisplayMajorUnits
False
True
Shows or hides the major units markers of the scale.
True = Show, False = Hide.
DisplayMinorTicks
False
True
Shows or hides the minor tick marks of the scale.
True = Show, False = Hide.
DisplayMinorUnits
False
True
Shows or hides the minor units markers of the scale.
True = Show, False = Hide.
DisplayType
0 – Analogue
1 – Digital
2 – Text
Determines the type of display.
0 – Analogue: as a numeric value, 1 – Digital: as textual value,
2 – Text: as text.
Enabled
True
False
Switches the object on or off.
True = On, False = Off.
Font
Arial
This is the system name of the font used for the object title. Use the browse
button to display the font dialog. Arial is the default.
FontColour
Height
&H00000000&
141
The code determines the colour of the title font. Click the browse button to
display the colour palette.
Sets the overall height of the object in pixels.
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Property Title
Example Values
IndicatorColour
&H00FF0000&
Description
The code determines the colour of the indicator. Click the browse button to
display the colour palette.
ItemName
Output Flow No1
This is the reference name given to the object.
KnobBorderPercentage
25
This value determines the size of the knob border as a percentage of the
overall size.
KnobColour
&H02C4723E&
The code determines the colour of the knob. Click the browse button to
display the colour palette.
KnobStyle
0 – Integer
1 – Real
Determines how the numerical value of the knob is interpreted
0 = as an integer or 1 = as a real number.
LeadingZeros
False
True
Turns On or Off the leading zero’s of the display.
False = On, True = Off.
LEDColour
&H00FF0000&
The code determines the default or inactivated colour of the LED indicator.
Click the browse button to display the colour palette.
Left
153
Determines the position of the object from the left hand edge of the work area
in pixels.
Locked
True
False
Locks the actions of the ActiveX object.
True = Locked, False = Unlocked.
MajorTickInterval
10
Sets the number of major tick intervals.
MaxAngle
180
Determines the length of the arc for rotary gauges. Range ±360 .
MaxCharacters
6
Determines the number of digits to be included in the display.
0
MaxDecimalPlaces
2
Determines the position of the decimal point in the display.
MaxGaugeValue
50
Sets the maximum value of the gauge.
MaxValue
999.99
Sets the maximum value that can be shown by a display.
MinAngle
0
Determines the length of the arc for rotary gauges. Range ±360 .
0
MinGaugeAngle
50
Sets the minimum angle of the gauge.
MinGaugeValue
10
Sets the minimum value displayed on the gauge.
MinorTickInterval
2
Sets the number of tick intervals between each major tick interval.
MinValue
-999.99
Sets the minimum value that can be shown by a display.
NumberBase
10
Number Base for 7 Segment e.g. 2 for Binary, 10 for Decimal, 16 for
Hexadecimal
NumberOfDigits
3
Determines the number of digits to be included in the display.
Orientation
0 or 1
Sets the orientation of the gauge – Horizontal or Vertical.
0 = Vertical, 1 = Horizontal.
PrintObject
True
False
Determines if this ActiveX object will be shown on a printout of the work
sheet.
True = Printed, False = Not printed.
Round
0 or 1
Determines the shape of the LED indicator. 0 = Square, 1 = Round.
ScaleFont
Arial
This is the system name of the font used for the scale. Use the browse
button to display the font dialog. Arial is the default.
ScaleFontColour
&H00000040&
The code determines the colour of the scale font. Click the browse button to
display the colour palette.
SegmentColour
&H0000C000&
The code determines the colour of the display segments. Click the browse
button to display the colour palette.
Shadow
State0Colour
State0Text
State1Colour
True
False
&H000000FF&
Text
&H0000FF00&
Adds or removes a shadow from the object giving it a raised appearance.
True = Shadow On, False = Shadow Off.
The code determines the colour of the toggle switch in the 0 state. Click the
browse button to display the colour palette.
This is the text indicating the 0 state of the switch, i.e. Off, Stopped, Halt etc.
The code determines the colour of the toggle switch in the 1 state. Click the
browse button to display the colour palette.
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Property Title
Example Values
Description
State1Text
Text
This is the text indicating the 1 state of the switch, i.e. On, Running, Start etc.
StateFont
Arial
This is the system name of the font used to display the sate of the switch ro
button. Use the browse button to display the font dialog. Arial is the default.
StateFontColour
&H00000000&
The code determines the colour of the title font. Click the browse button to
display the colour palette.
Title
Text
This is the title that appears in the object.
TitlePosition
0 – Top
1 – Bottom
Determines where title will be placed in the object. Above or below the scale.
Top
230
Determines the position of the object from the top of the work area in pixels.
UnitPostion
0 – Inside
1 – Outside
Positions the dial units inside or outside the scale.
UpdateRate
10
The value sets the frequency, in seconds, at which the data passing to or
from the object is updated.
Value
0
Determines the default value of the ActiveX object.
Visible
True
False
Switches the object between visible and invisible in run mode.
True = Visible, False = Invisible.
Width
98.25
Determines the overall width of the object in pixels.
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Appendix B
Script Interface
The Script Interface defines the Visual Basic script interface for the OPC communications
control.
Functions
Value
Read
Write
GetData
StopData
OnData
Function for getting and setting an OPC item value.
Function to read the value of an OPC item.
Function to write the value of an OPC item.
Function for starting OnData events.
Function for stopping OnData events.
Event for receiving notification of a change in data.
Value
Reads or writes the value of an OPC item.
Example 1 – Reading a value:
intVal = OPCComms1.Value(“MyGroup”, “BoilerTemp”)
In this example, the OPC item ‘BoilerTemp’ in the OPC group called “MyGroup” will be read
from the OPC Server and will be stored in ‘intVal’.
Example 2 – Writing a value:
OPCComms1.Value(“MyGroup”, “BoilerTemp”) = 50
In this example, the value 50 will be written to the OPC item ‘BoilerTemp’.
Note: ‘Value’ is the default property for all objects, so is assumed if omitted. Therefore, the
following examples are the same:
intVal = OPCComms1.Value(“MyGroup”, “BoilerTemp”)
and
intVal = OPCComms1(“MyGroup”, “BoilerTemp”)
Read
Reads the value of an OPC item.
Example of synchronous read:
intVal = OPCComms1.Read(“MyGroup”, “BoilerTemp”, WaitUntilComplete)
In this example, the OPC item ‘BoilerTemp’ in the OPC group called “MyGroup” will be read
from the OPC Server and will be stored in ‘intVal’. The script will wait for the read operation to
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Getting Started with CX-Server OPC
complete before continuing to execute the next line. This is identical to the operation of the
‘Value’ method.
Example of asynchronous read:
OPCComms1.Read “MyGroup”, “BoilerTemp”, NoWaiting
In this example, the OPC item ‘BoilerTemp’ in the OPC group called “MyGroup” will be read
from the OPC Server. The script will continue to execute the next line immediately, and when
the data is read, it generates an OnData event.
Write
Writes the value of an OPC item.
Example of synchronous write:
OPCComms1.Write “MyGroup”, “BoilerTemp”, NewValue, WaitUntilComplete
In this example, ‘NewValue’ will be written to the OPC item ‘BoilerTemp’ in the OPC group
called “MyGroup”. The script will wait for the write operation to complete before continuing to
execute the next line. This is identical to the operation of the ‘Value’ method.
Example of asynchronous write:
OPCComms1.Write “MyGroup”, “BoilerTemp”, NewValue, NoWaiting
In this example, ‘NewValue’ will be written to the OPC item ‘BoilerTemp’ in the OPC group
called “MyGroup”. The script will continue to execute the next line immediately.
GetData
Starts asynchronous data reading of the specified OPC item at the group update rate
Example
OPCComms1.GetData “MyGroup”, “MyItem”
In this example, MyItem in MyGroup would be read at the group update rate. Data is then sent
to the OnData routine.
StopData
Stops asynchronous data reading of the specified OPC item
Example
OPCComms1.StopData “MyGroup”, “MyItem”
In this example, the asynchronous reading of MyItem in MyGroup would be stopped.
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OnData
This event is sent back to the container (e.g. Excel) when data has changed. This is either data
started by calling GetData, or by calling Read or Write in asynchronous mode.
Example
Private Sub OPCComms1_OnData(ByVal Group As String, ByVal
Item As String, ByVal Value As Variant,
ByVal BadQuality as Boolean)
TextBox1 = Item
Segment1 = Value
End Sub
In this example, the CX-Server 7 Segment component is set to the value of the point and a text
box is set to display the name of the item.
If BadQuality is set to True then the value may be inaccurate e.g. from a device which has been
disconnected.
The OnData routine can be enhanced to include logical expressions on the incoming Item
name and then update the correct graphical object etc. for example:
Private Sub OPCComms1_OnData(ByVal Group As String,
ByVal Item As String, ByVal Value As
Variant, ByVal BadQuality as Boolean)
If Item = “MyItem” then
Segment1 = Value
Else if Item = “MyOtherItem” then
Cells(1,1) = Value
End if
End Sub
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Glossary of Term s
ActiveX
Application
Bitmap
Communications Driver
GUI
I/O type
Icon
Microsoft Excel
Microsoft Windows
Microsoft Word
OLE
OPC
OPC Client
OPC Group
OPC Item
A component technology developed by Microsoft allowing components
to communicate with applications.
A software program that accomplishes a specific task. Examples of
applications are SYSMAC-SCS, SYSMAC-CDM, Microsoft Word and
Microsoft Excel
The representation of an image stored in a computer’s memory. Each
picture element (pixel) is represented by bits stored in the memory.
The relevant communications management system for OMRON PLCs
in conjunction with Microsoft Windows, providing facilities for other
SYSMAC software to maintain PLC device and address information
and to communicate with OMRON PLCs and their supported network
types.
Graphical User Interface. Part of a program that interacts with the user
and takes full advantage of the graphics displays of computers. A GUI
employs pull-down menus and dialog boxes for ease of use.
Input / Output type. An attribute of a point that defines the origin and
destination of the data for that point. The data for a point can
originate (be input from) and is destined (is output to) to the internal
computer memory, a PLC or a target application
Pictorial representations of computer resources and functions
A spread sheet application.
A windowing environment for MS-DOS computers, that is noted for its
GUI, and for features such as multiple typefaces, desk accessories
(such as a clock, calculator, calendar and notepad), and the capability
of moving text and graphics from one application to another via a
clipboard.
CX-Server OPC will run only under Microsoft Windows.
A word processing application.
Object Linking and Embedding. Used to transfer and share information
between Microsoft Windows based applications and accessories.
Abbreviation for OLE for Process Control. Open standard for the
exchange of data between OPC Servers and OPC Clients used within
the process control industry.
A software application which uses an OPC interface to exchange data
with an OPC Server.
A collection of OPC Items.
A single piece of data e.g. a PLC memory area stored with an OPC
Server.
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OPC Server
PC
Pixel
PLC
Point
SVGA mode
Windows Desktop
Getting Started with CX-Server OPC
A software application which uses an OPC interface to provide data
to OPC Clients.
Abbreviation for Personal Computer.
A single displayable point on the screen from which a displayed image
is constructed. The screen resolution of the computer’s Visual Display
Unit (VDU) is defined by the number of pixels across and the number
of pixels down (e.g. 1024 x 768).
Abbreviation for Programmable Logic Controller.
A point is used to hold a value of a predefined type - Boolean, Integer,
Text, etc. The contents of a point may be controlled by an object or
I/O mechanism such as DDE. The contents of a point may control the
action or appearance of an object, or be used for output via an I/O
mechanism.
A mode of video display that provides 800 × 600 pixel resolution (or
higher) with 16 or more colours and is supported on Super Video
Graphics Adapter systems.
An integral part of Microsoft Windows which allows Microsoft
Windows based applications to be started from icons and for all
applications to be organised.
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Index
A
I
About CX-Server OPC · 9
About this Manual · 6
ActiveX Objects
7 Segment · 14
Display · 14
LED Indicator · 14
Linear Gauge · 14
OPC Communications · 14
Rotary Knob · 15
Rotational Gauge · 14
Timer · 15
Toggle · 15
Adding a 7 Segment Display · 17
Adding the Communication Control · 15
Adding Third Party ActiveX Controls · 19
Advanced Properties · 21
Inserting Data in Cells · 18
Installing/Uninstalling CX-Server OPC · 8
C
Component Properties · 23
Configuring server for remote connection · 12
Connecting to an OPC Server · 16
Controlling ActiveX Objects · 22
E
Event Driven Routines · 20
G
Getting Started with CX-Server OPC · 6
Glossary of Terms · 29
H
Hardware Requirements · 7
Operating Systems · 7
Help Topics · 9
O
Objects Overview · 14
OPC
Foundation web site · 10
What is it? · 10
OPC Server
Configuring for remote connection · 12
Starting · 10
Using Third Party OPC Clients · 11
Operating Systems · 7
Other Features · 19
Advanced Properties · 21
Controlling ActiveX Objects · 22
Event Driven Routines · 20
The Project Tree · 22
P
Project Tree · 22
R
Running an Application · 18
S
Script Interface · 26
Functions · 26
Script Interface Functions
GetData · 27
OnData · 28
StopData · 27
Starting CX OPC Server · 10
System Requirements · 7
Hardware Requirements · 7
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T
V
Technical Support · 9
The Help System, and How to access it · 8
Tutorial Step 1 Viewing Data using Omron
Graphical Control · 15
Tutorial Step 2 Inserting Data in Cells · 18
Tutorial Step 3 Adding Third Party ActiveX
Controls · 19
Viewing Data using Omron Graphical Control · 15
W
What is OPC? · 10
U
Using the OPC Client components · 14
Using the OPC Server · 10
Using Third Party OPC Clients · 11
Page 32
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