Gb Mpd 20080331 Trn Opc Module01
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Transcript of Gb Mpd 20080331 Trn Opc Module01
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01 - Road Map
OPC
Saad Saeed ([email protected])Houston, TX
Revision 00: 31-Mar-2008Not
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GeoBalance Training Project
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Agenda• Introduction
– OPC– The PSL’s OPC System (PSL-OPC)
• Background– A bit of History– Base technologies
• Theory of Operation & Functional Description– OPC DA– OPC HDA– OPC A&E– OPC Tunneling
• Installation• Operation• Troubleshooting & Diagnostics
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What is OPC?
• Definition
“OPC or OLE for Process Control is a standardized protocol for
communication of data between devices and systems”
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What is OPC? - II
• Protocol = Set of rules = Specifications
OPC Overview
OPC Unified Architecture
OPC Security OPC Common Definitions
OPC Complex Data
OPC Alarms and Events
OPC Historical Data Access OPC Commands OPC Data Access OPC XML DA
OPC Batch OPC Data eXchange
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What OPC is NOT
• A Software Application• A Client• A Server
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Before OPC
• Each application had it’s own driver• Proprietary data paths• Little integration• Some solutions, but …
– Data was locked
In the dark days before
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Before OPC• Before 1990’s
– Systems used proprietary communications interfaces for access to Real Time Information
– Each new supplier’s hardware needed custom code
Modbus
Proprietary ACSII
PLC
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Why is OPC Data Access needed?
SoftwareDriver
SoftwareDriver
SoftwareDriver
SoftwareDriver
DisplayApplication
TrendApplication
ReportApplication
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OPC Solves the Problem
SoftwareDriver
SoftwareDriver
SoftwareDriver
SoftwareDriver
OPC OPC OPC OPC
DisplayApplication
TrendApplication
ReportApplication
OPC OPC OPC
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OPC Vision
• Standardize on technology, not product• No proprietary formats• Universal connectivity
Along came a solution
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Hands-on Exercise: IC
1. Start OPC Client application (“Client”)2. Connection OPC Client to an OPC Server3. Add an OPC Group
a. Use default settings4. Add OPC items (subscribe)5. View live data
Initial connection (IC)
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Hands-on Exercise: AC
6. View group propertiesa. Set update rate to 0 ms. What happens?
7. Change the display update rate8. Connect to another OPC Server and add items
a. Is it possible?
Advanced capabilities (AC)
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Hands-on Exercise: Questions
1. How often does data change?2. Do all values change at the same rate? Why?3. What information is available for each item?4. What data types are available?5. Where did the data type come from?6. What was the fastest update rate possible with this
OPC Server?7. Where is this value set?8. Is this rate the same for all OPC Servers?
Let’s discuss
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OPC Technology Defined …• Published (i.e. not proprietary) industrial
specification for system interconnectivity• Based on:
– Microsoft Active X, COM/DCOM– XML– .NET
• Client / Server Architecture• What does OPC stand for
– Open Process Connectivity– OLE for Process Control– Old Programmers’ Club– OPC
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Background
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OPC History In the beginning
Windows 3.0
DDE
OLE
OPC Task force
OPC FoundationOPC DA 1.0
OPC HDA 1.0
OPC A&E 1.0
OPC DA 2.04
OPC DA 2.0
OPC Security 1.0
OPC XML-DA 1.0
OPC DA 3.0
OPC Commands
1.0
OPC UA Committee
OPC UA Security
Model 1.00
OPC UA HDA 1.00
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Product-Specific Drivers
• Developed for specific product• Proprietary protocol• Manufacturer specific format
– E.g. NI MAX
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DDE
• Dynamic Data Exchange• Share data
– Between Applications• Communication
– Windows (OS) Messages– Shared Memory
Application BApplication B
Windows Shared Memory
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OLE
• Object Linking and Embedding• Enables
– Embedding of Objects– Linking of Objects
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DCOM
• Distributed Component Object Model• Enables communication of software components
across a network
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COM/DCOM and OPC• Applications use
– COM to communicate on a single User Account– DCOM to communicated between User Accounts
• COM is always faster than DCOM• COM enables processes to communicate with each
other• DCOM enables programmers to distribute COM• OPC is an instance of COM
– OPC apps are COM apps– OPC Server is a COM server– OPC Client is a COM client
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COM Object Identification
• Global Unique Identifier (GUID)– Also known as ClassID (CLSID) or AppID– 128 bit – Globally unique– E.g. {4A79114D-19E4-11d3-B86B-00C04F79F802}
• Program Identifier (ProgID)– Human friendly reference for GUID– Examples
> Cogent.OPCDataHub.1> KEPware.KEPServerEx.v4
• Information is stored in Windows Registry
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.NET
• .NET
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Functional Description
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Client / Server Architecture
• OPC Client– Consumes data (OPC Consumer)– Makes requests– In “charge”
• OPC Client Applications– HMI– Sentry
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Client / Server Architecture
• OPC Server– Provides data (OPC Producer)– Provides responses– In “service”
• OPC Server Applications– PLC– INSITE
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Client / Server Architecture
• OPC Client and Server Communicate• OPC Client makes requests• OPC Server responds• Multiple Responses• Client/Server conversation
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Client / Server Architecture
• 1 Client can communicate with many Servers• 1 Server can communicate with many Clients• Limitations
– Computer resources– Licencing
• Common Pitfalls:– Vendor Limits number of Client/Server connections
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The Logical Object Model
OPCServer
OPCGroup
OPC/COMInterfaces
OPCGroupOPCGroup(s)
OPCItem(s)OPCItem(s)OPCItem(s)OPCItem(s)OPCItem(s)OPCItem(s)
OPCItem(s)OPCItem(s)OPCItem(s)
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General OPC Data Layout
This is a screen using a tool called OPC Data Spy
Computer Level
OPC Flavor Level
OPC Server Level
OPC Items Tree
OPC Item
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OPC DA• OPC Data Access (DA)
– Enables applications to exchange real-time data• Data Items have
– Value– Quality– Timestamp
• Key functions– Read / Write data– Subscribe/Unsubscribe to data– Browse for available servers and data
• Real-time values only
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Adding Groups
• All items in a Group share the same update rate• Groups
– Private / Local– Accessible to only one client
• Update rate– Set in milliseconds– If server cant support the specified rate, it can return
a rate that it can support– Passing 0 indicates the Server should use the fastest
practical update rate
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OPC DA: Sync and Async• Synchronous (Sync)
– Must wait for confirmation– Important for “Order of Operations”
• Asynchronous– Can send multiple requests– Improves performance when possible
• Insight– Speed / resource issues– What circumstances for each method?
• Common pitfalls– Only Sync R/W
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OPC DA: Reading Data
• Reading– Polling– Subscription (report by exception)– Cache read– Device read
• Insight– Speed / resources issue– What circumstances for each method
• Common Pitfalls– Using only device reads– Polling instead of subscription
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OPC DA: Reading Data
• 6 ways Client can read data– Sync Read (cache or device)– Async Read (device)– On Data change (cache or device)– Item Read (cache or device)– Sync Read Max Age (cache or device)– Async Read Max Age (cache or device)
• Async refresh triggers exception• Subscription uses many callbacks
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OPC DA: Writing Data
• OPC Clients can write to Servers• Server can prioritize for writes• Client can write
– Value– Quality– Timestamp
• Typically, clients only write value– Example?
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OPC DA: Writing Data
• Sync Write• Async Write• Item WriteVQT• Sync WriteVQT• Async WriteVQT
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OPC DA: Timestamps
• Items includes timestamp information (UTC)• Timestamp can come from
– Device (if it is available)– OPC Server
• Insight– When is accuracy important– Is synchronization needed?
• Common Pitfalls– OPC Server ignores device timestamp– Device clock is inaccurate
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OPC DA: Quality• Items includes Quality information• Example Qualities:
– Good, non specific– Bad, last known value– Bad, communication failure
• Quality can come from– Device (if it is available)– OPC Server
• Insight: What if there is a read error• Common Pitfalls
– OPC Server ignores quality– OPC Client has trouble with bad quality
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OPC DA: Performance
• Can pass thousands for points per second• OPC is rarely the bottleneck
– Serial (300 items/s)– Noisy (radio or satellite)– Slow device– Inefficient API– Computer hardware
• Insight:– Polling instead of subscription– Device instead of Cache reads– Non optomised OPC server
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Hands-on Exercise: IC Excel
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OPC & Your Workflow
• Install software– OPC Common Definitions
• Start Client• Browse for OPC Servers
– OPCEnum• Client connects to Server
– OPC Data Access• Read/Write Data
– OPC Data Access
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OPC General Connection
Connect to the OPC Server
Add Group(s)
Add Item(s) to Group(s)
Activate Groups & Items
Data Change Events Fire
De-Activate Groups & Items
Remove Item(s) from Group(s)
Remove Group(s)
Disconnect from the OPC Server
User Program Handles Data - Log, Display, Graph, etc
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PSL-OPC: Overview• Server
– Softing OPC Server– NI FieldPoint OPC Server– INSITE OPC Server
• Client– KEPware OPC Quick Client– NI Server Explorer– Softing Demo Client– Sentry– Sintef
• Core– DCOM– OPCEnum
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PSL-OPC: OverviewP
TF
D... ...
Sensors
PT
FD
... ...
Sensors
INSITE Applications
KEPware OPC Quick
Client
NI Server Explorer
Softing Demo Client
Softi
ng O
PC
Serv
er
NI F
ield
Poin
t O
PC S
ever
INSI
TE O
PC
Serv
erSentry
Sie
men
s P
LC
NI D
atal
ogge
r
INS
ITE
OPCEnum
DCOM
Client pack
Server pack
Post packCore pack
Saad Saeed | 31-Mar-2008 | rev 0
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Softing OPC Server• Purpose
– The purpose of the Softing OPC Server is to communicate with the Siemens S7 PLC (device) and make the real-time PLC readings, control and computed values available via OPC.
• Details At A Glance:– Name: Softing OPC Server– PSL-OPC Pack: Server– Version: 3.12– OPC DA server name: Softing S7/S5 OPC Server– OPC DA server CLSID: {6F17505C-4351-46AC-BC1E-
CDE34BB53FAA}– OPC DA server ProgId: Softing.OPC.S7.DA
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Softing OPC Server
PT
FD
... ...
Monitoring (Sensors)
Saad Saeed | 31-Mar-2008 | rev 0
... ...
Control (Chokes, Valves)
Siemens Simatic S7 program
Siemens S7-xxx PLC
Softing OPC Server
Device driverOPC server
Field monitoring and control components (sensors, valves, etc)Key:
OB/FB/FCDB/Config
DC
OMOPC DA
OPC XML-DA
Web
Ser
vice
Signal Ethernet Software/API call 4-20 mA or Digital Proprietary protocol OPC
CLSID={6F17505C-4351-46AC-BC1E-CDE34BB53FAA}
Sie
men
s P
LC
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NI FieldPoint OPC Server• Purpose
– The purpose of the NI FieldPoint OPC Server is to communicate with the NI Compact FieldPoint datalogger (device) and make the real-time signals, readings and computed values available via OPC.
• Details At A Glance:– Name: NI FieldPoint OPC Server– PSL-OPC Pack: Server– Version: 4.1.0.3001– OPC DA server name: FieldPointOPC2– OPC DA server CLSID: {D72CD703-BD32-11D3-9D41-
0000C0337A95}– OPC DA server ProgId: National Instruments.OPCFieldPoint
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NI FieldPoint OPC Server
PT
FD
... ...
Monitoring (Sensors)
Saad Saeed | 31-Mar-2008 | rev 0
NI cFP-21xx
NI FieldPoint OPC Server
Device driverOPC server
Field monitoring components (sensors, etc)Key:
DC
OMOPC DA
Signal Ethernet Software/API call 4-20 mA or Digital Proprietary protocol OPC
CLSID={D72CD703-BD32-11D3-9D41-0000C0337A95}
NI D
atal
ogge
r
NI FieldPoint Server (FP Server)
NI IAK file
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INSITE OPC Server• Purpose
– The purpose of the INSITE OPC Server is to communicate with INSITE (device) and make INSITE real-time broadcast data available via OPC.
• Details At A Glance:– Name: INSITE OPC Server– PSL-OPC Pack: Server– Version: 29-Aug-2007– OPC DA server name: Halliburton.InsiteOPC OPC DA Server– OPC DA server CLSID: {C64AC028-41B1-4B01-AD45-
3CB7CDA4725E}– OPC DA server ProgId: Halliburton.InsiteOPC.1– If the OPC server is installed as an NT service, the following
names are used:> NT service name: Halliburton.InsiteOPC> NT service description: Halliburton.InsiteOPC OPC DA Server
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Installation
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Installation
1. Server1. Softing OPC Server (Licensing)2. NI FieldPoint OPC Server3. INSITE OPC Server
2. Client1. KEPware OPC Quick Client2. NI Server Explorer3. Softing Demo Client4. Sentry (later)
3. Core1. DCOM2. OpcEnum
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Key
• key= 0160-0000-0000-2e5d
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Operation
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Operation
1. Server1. Softing OPC Server 2. NI FieldPoint OPC Server3. INSITE OPC Server
2. Client1. KEPware OPC Quick Client2. NI Server Explorer3. Softing Demo Client4. Sentry (later)
3. Core1. DCOM2. OpcEnum
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XML-DA Simulation
• http://192.168.0.50/Simulator-XML-DA/KEPware.KEPServerEx.V4.asmx
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The End
• The End of this presentation