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Table of contents
Industrial Communication with PG/PC Volume 1 - Basics
System Manual, Release 04/2010, C79000-G8976-C172-09 5
3.3 OPC Alarms & Events..................................................................................................................97
3.3.1 Introduction to OPC Alarms & Events..........................................................................................97
3.3.1.1 OPC Alarms & Events - what does it mean?...............................................................................97
3.3.1.2 Events and event messages - what are they?.............................................................................98
3.3.1.3 Class model of OPC Alarms & Events - what does it do? ...........................................................99
3.3.1.4 OPC event server class - what does it do?..................................................................................99
3.3.1.5 OPC event subscription class - what does it do? ......................................................................100
3.3.1.6 OPC event area browser class - what does it do?.....................................................................101
3.3.1.7 Message reception - how does it work? ....................................................................................101
3.3.1.8 Alarms in SIMATIC S7 - how are they defined? ........................................................................102
3.3.1.9 Alarms - what happens in practice (example)?..........................................................................104
3.3.2 Alarms & Events Interface .........................................................................................................106
3.3.2.1 Interfaces - which interfaces are specified for Alarms & Events?..............................................106
3.4 OPC XML...................................................................................................................................106
3.4.1 Introduction to XML and SOAP..................................................................................................106
3.4.1.1 XML and SOAP - what are they?...............................................................................................106
3.4.1.2 Web services - what do they do?...............................................................................................109
3.4.2 OPC XML Interface....................................................................................................................109
3.4.2.1 OPC XML interface - what does it do? ......................................................................................109
3.4.2.2 OPC XML Web service - how does it work?..............................................................................111
3.4.2.3 Read/write simple services - what methods are there in XML?.................................................111
3.5 OPC Unified Architecture...........................................................................................................113
3.5.1 Introduction to OPC UA .............................................................................................................113
3.5.1.1 Introduction ................................................................................................................................113
3.5.1.2 Security with OPC UA................................................................................................................114
3.5.1.3 Types of communication of OPC UA .........................................................................................114
3.5.1.4 The name space of OPC UA .....................................................................................................117
3.5.1.5 Other characteristics of OPC UA ...............................................................................................120
3.5.2 The OPC UA interface ...............................................................................................................120
3.5.2.1 What interface specifications of the OPC Unified Architecture exist? .......................................120
3.5.2.2 How is a connection made to an OPC UA server?....................................................................121
3.5.2.3 How can the OPC UA name space be browsed?......................................................................123
3.5.2.4 How can data be read and written? ...........................................................................................123
3.5.2.5 How are UA data and events monitored?..................................................................................124
3.5.2.6 How is extra fast reading and writing achieved after registration? ............................................128
3.5.2.7 How do events, conditions and alarms work? ...........................................................................128
3.6 Performance of OPC Data Access and OPC Alarms & Events in SIMATIC NET.....................131
3.6.1 Performance - how can I make optimum use of it? ...................................................................131
3.6.2 OPC server from SIMATIC NET in the automation world - how is it used? ..............................133
3.6.3 OPC Server for SIMATIC NET - what are the advantages?......................................................133
3.6.4 OPC server from SIMATIC NET - what does it do?...................................................................135
3.6.5 Process data - how is optimum access achieved?....................................................................136
3.6.6 Group operations - how are they used? ....................................................................................137
3.6.7 OPC cache - what is it? .............................................................................................................137
3.6.8 MaxAge - what is that? ..............................................................................................................138
3.6.9 Services use the cache - how does that work (example)? ........................................................138
3.6.10 Protocols - which can be optimized? .........................................................................................138
3.6.11 Buffer send/receive services - why are they used? ...................................................................139
3.6.12 Buffer send/receive services - how are they used (example)?................................................140
3.6.13 Methods - how are suitable methods used?..............................................................................140
3.6.13.1 Synchronous access - what types exist?...................................................................................140
3.6.13.2 Asynchronous access - what types exist? .................................................................................141
3.6.13.3 Monitoring variables - what happens here?...............................................................................142
3.6.14 Percent Deadband - how is this parameter used?.....................................................................144