Siemens OPC UA User manual

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OPC UA for S7-1500 and S7-1200

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• Founded 1996 (OPC Classic specification) ,OPC UA specification release 2009

• More than 450 members from all areas

OPC UA at a glance OPC Foundation

ABB Automation GmbH

ascolab GmbH

Beckhoff Automation GmbH

Bosch Rexroth AG

Bosch Software Innovations GmbH

Bundesamt für Sicherheit in der Informationstechnik (BSI)

CERN

Cisco Systems

Emerson Process Management

Endress+Hauser Process Solutions AG

FANUC CORPORATION

Festo AG & Co. KG

Fraunhofer IOSB

Hilscher Gesellschaft für Systemautomation mbH

HMS Industrial Networks

Honeywell Inc

IBM

PHOENIX CONTACT

Pilz GmbH & Co. KG

SAP AG

ProSoft Technology

Rockwell Automation

Schneider Electric

Siemens AG

Softing Industrial

Yokogawa Electric Corporation

Unified Automation GmbH

Microsoft Corporation

B&R

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OPC UA at a glance Cooperations

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North-South Alignment Strategic alignment of OPC UA and PROFINET

SCADA, DCS

MES, ERP

Cloud

North

South

V15.1

OPC UA

PROFINET

Energy

management

SCADA-

System

Engineering-

Framework

Manufacturing Execution System

HMI

IPC

Industrial

Communication

Motion Control

CNCController

Power supply

and

distribution

Industrial

Identification

Decentral IO

Drives Industrial

controllers

PROFINET

OPC UA

Industrial Ethernet

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OPC UA Data Access Client (SIMATIC S7-1500) Customer use cases

Vertical Line Integration: e.g. MES, SCADA

Industry Standard Support

Companion Specifications & Methods

Method

Object

Variable

Variable – Property

Machine

PLC

Machine

PLC

OPC UA

Server S71500

OPC UA Client

OPC UA

Client

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OPC UA Server S71200

Inbuilt server interface

building

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S7-1500 OPC UA Server

Browsing of SPS-Data

Browse Response

Browse Request

Acyclic access to data

R/W Response

R/W Request

High performance with repeated acyclic access

R/W Response

R/W Request

Node Handles

Registering

Nodes

Load reduction for HMI / monitoring applications

Publishing

Consistent data transfer through function call (no handshakes)

Call Response ( )

Call Request ( )

Information modeling

Browsing

Read/Write

Registered

Read/Write

Subscription Methods

Companion Specifications

Client Client Client Client Client Client

Server Server Server Server Server Server

Sampling

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S7-1500 S7-1200

*: Only for user modelled

interfaces

S7-1500 S7-1200

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OPC UA Server for SIMATIC S7-1500 based CPUs Functional scope

Browse

• Browsing of PLC Data

• Dynamic adaptation of the client configuration to the data provided by a server

OPC UA

server

Browse

Browse request

Node ID = 84 (root folder), BrowseDirection = forward

Browse response

Node ID, browse name, display name, node class, type def

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OPC UA Server for SIMATIC S7-1500 based CPUs Functional scope

Read

• Symbolic read access to PLC data

OPC UA

server

Data access

Read request

Node ID = "DB1"."myArray“

Read response

Value = “11110000”, Timestamp = 10/29/2018 3:15pm, Status = Good

1111

0000

DB1.myArray

1111 0000

DB1.myArray

1111

DB1.myArray

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OPC UA Server for SIMATIC S7-1500 based CPUs Functional scope

• Symbolic write access to PLC data

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Write

OPC UA

server

Write request

Node ID = "DB1"."myArray“, Value = “11111111”,

Write response

Status = Good

1111

0000

DB1.myArray

1111 1111

DB1.myArray

1111

DB1.myArray

1111 1111

DB1.myArray

✓

Data access

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OPC UA Server for SIMATIC S7-1500 based CPUs Functional scope

Registered Read

• Repeated access to PLC data

OPC UA

server

Data access

Read request

Node ID = "123456789"

Read response

Value = “11110000”, Timestamp = 10/29/2018 3:15pm, Status = Good

1111

0000

DB1.myArray

1111 0000

123456789

Improved performance with repeated access

Node ID: "123456789“

Memory: 16# ABCD_01234

1111

123456789

Node ID: "DB1". "myArray" Node ID: "123456789"

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OPC UA Server for SIMATIC S7-1500 based CPUs Functional scope

• Load reduction for monitoring use cases

• Absoulte filters possible

*: Simplified illustration

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OPC UA

server

Subscribe request

Node ID = „DB1“.“myArray“, Publishing interval = 5s, Sampling interval = 1s

1111

0000

DB1.myArray

1111

0000

DB1.myArray

Sampling

Publishing

1111

DB1.myArray

Publish response

1111

DB1.myArray

Publish response

Value = “11111111”, Timestamp = 10/29/2018 3:15pm, Status = Good

Publish response

Value = “11110000”, Timestamp = 10/29/2018 3:15pm, Status = Good

Publish request

Sampling Queue

1111 0000

DB1.myArray

1111 1111

DB1.myArray

Load reduction for monitoring use cases (Compared to polling)

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Call request

Node ID = “instDrive".“Method“, InputArguments: [ DriveSpeed = “99999” ]

Call response

OutputArguments: [ ] Status = BadInvalidArgument

OPC UA Server for SIMATIC S7-1500 based CPUs Functional scope

Methods

OPC UA

server

Call request

Node ID = “instDrive".“Method“, InputArguments: [ DriveSpeed = “1000” ]

Call response

OutputArguments: [ ] Status = Good

Drive Method FB

SetDrive

Speed

RPM: 0RPM: 1000

• Consistent data transmission

• Request based interaction with the user program

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OPC UA with SIMATIC CPUs Access type recommendations

Use case Recommended type of access

• Single or rare access of data



Read / Write

• Cyclic read of data (≤ 10s)

• Monitor data



Subscription

• High performance data access

to predefined nodes



Registered Read / Write

• Consistent data transfer

• No manual Handshake



Methods

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Accessing 1000 variables of real Accessing one structure with 1000

variables of real

Accessing one array with 1000

variables of real

OPC UA Read OPC UA Registered Read

PLC programmer

Always structure your data:

1. Arrays

2. Structures

3. Individual Variables

OPC UA Client

programmer

Read arrays and structures as a whole!

User OPC UA

“Registered Read” when

accessing the same data recurrently

Graphic shows

tendencies,

actual values

depend on

multiple factors!

Factor

2-3

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Performance – Usage of arrays and structures whenever possible

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SIMATIC S7-1500 OPC UA Server Functional scope - SiOME

Companion Specifications

• Standardized OPC UA interfaces • Information modelling

instance DB

Link

https://support.industry.siemens.com/cs/us/en/view/109755133

Instances / models > according to specification

Import

Types according to

specification

Export

Types, Instances, Mapping

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OPC UA Server for SIMATIC S7-1500 based CPUs Functional scope

Companion Specifications

• Standardized OPC UA interfaces • Information modelling

Standard SIMATIC interface

Additional interfaces

Companion specifications

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OPC UA Data Access Client (SIMATIC S7-1500 based CPUs) Functional scope from TIA V15.1 and FW 2.6

Read / Write

Asynchronous data access

Client

R / W Request

R / W Response

Server

Method Call

Consistent data transmission

Client

Call Request

Call Response

Server

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OPC UA Data Access Client (SIMATIC S7-1500 based CPUs) Configuration

• OPC UA runtime license is necessary

(Server license includes client license)

• The client must be activated in the device configuration

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OPC UA Security

General

• OPC UA security actions are based on the following IT standards:

• Encryption

• Signing

• Authentication via certificate and user accounts

• Note:

Security mechanisms have a negative effect on performance, especially when establishing a connection. While operating, performance is reduced by approx. 10%.

User Accounts

• The configuration of user accounts is analogue to the web server.

• The configuration is mostly self-explanatory

Certificates

• The management of the certificates must be coordinated in detail with

the IT department of the user / customer.

• In many cases, certificates are managed centrally by the IT

department, which increases the consulting effort massively.

• Simple example:

S7-1500 and Third Party Client with self-signed certificates

(https://support.industry.siemens.com/cs/au/en/view/109737901, chapter 2.1.4)

• Consulting intensive example:

Integration into existing IT infrastructure with certificate generation by

Microsoft Active Directory

AD Server

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OPC UA Security Certificate based authentication

Project protection is necessary to activate centralized certificate management

This enables the global certificate manager which includes the certification authority

TIA Portal provides a project wide

certification authority (CA)

TIA Project

Client

Server

Client

Server

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OPC UA with SIMATIC S7 CPUs

Licensing

CPU

-Type

-1200

ET 200SP CPU

up to

CPU 1513

CPU 1515 / 1515SP PC

CPU 1516 / 1516pro

CPU 1507S

CPU 1517 / CPU 1518 /

CPU 1508S (New)

Required License

small medium largeBasic

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OPC UA System limits S7-1200 & S7-1500

Quantity structure

-1200

CPU 1510…13

CPU 1515/16

CPU 1517/18

No. of sessions, max.

53248

No. of accessible variables, max.

1,000

50,000

100,000

200,000

No. of registerable nodes, max.

10,000

20,000

50,000

No. of subscriptions per session, max.

52020

Sampling interval, min.

100 ms

Publishing interval, min.

200 ms

500 ms

200 ms

No. of server methods, max.

-2050

100

No. of in/outputs per server method, max.

-2020

No. of monitored items, recommended.

500 (max.)

1,000

2,000

10,000

for 1 s sampling interval and 1 s publishing interval

No. of server interfaces, max.

(SIMATIC, Information m., Reference m.)

2/2/x

10/10/20

No. of nodes for server interfaces, max.

1,000

5,000

30,000

Further information about system limits

https://support.industry.siemens.com/cs/au/en/view/109755846

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1000

2000

3000

100 500 1000 Struct of

1000

Array of

1000

Time [ms]

Items

[DINT]

Read avg. Registered Read avg.

Guideline 1: Requirement for good performance

Structuring and registering data

• Structuring of data budget required

(e.g. Transfer oriented storage of data in UDTs) ➔ The Client has to support access to UDTs

• Alternative: Using registered Read / Write

➔ The Client has to support registered access

Measuring (CPU 1516)

Example:

Modeling of system components in UDTs

• Registered access is approx. 10 times faster

• Structured access is approx. 100 times faster

• The CPU 1517/18 is up to 18 times faster compared to smaller CPUs

Client

Full access to UDTs

(Conveyor and ProductionUnit)

➔ High performance access to only three elements

100

150

200

250

300

100 500 1000 Struct of

1000

Array of

1000

Time [ms]

Items

[DINT]

Read avg. Registered Read avg.

Measuring (CPU 1518)

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Guideline 2: Influence on other types of communication

Resource pool for communication

• Note: Within the S7-1500 exists only one resource

pool for all non real-time communication types. (Webserver, alarms, HMI, TCP, UDP, S7, etc.)

• The size of this resource pool can be influenced by the

setting „maximum cycle load by communication“ and „minimum cycle time“.

• Due to its own resource pool, cyclic real-time

communication (e.g. PROFINET) has no influence on / through OPC UA.

• The load due to OPC UA may fluctuate greatly under

certain circumstances (logon processes of OPC UA

clients, for example, create a temporarily high

communication load).

Example: HMI communication without influence of OPC UA

All communication resources are available for HMI communication

Example: HMI communication with onfluence of OPC UA

The HMI communication is slowed down depending on the OPC UA

client.

(HMI and OPC UA client share the PLC communication resources)

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Guideline 3: Quantity structures

Small quantity structures

• Small quantity structures without strict time requirements are

usually not critical

• Example:

Transfer of machine status and energy data (approx. 100 data points per second) to a cloud gateway

Large quantity structures

• Large quantity structures should be coordinated with the technical

advisor (the possible quantity structures depend strongly on the client).

• Example:

Use of OPC UA as an integrated communication standard for HMI, SCADA, MES with more than 1000 data points per second.

• General:

The maximum quantity structures of the CPU 1517 and 1518 are up to a factor of 10 higher compared to smaller CPUs (e.g. 1510).

OPC UA

Cloud

Gateway

Cloud Protocol

OPC UA

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Guideline 4: Security

General

• OPC UA security actions are based on the following IT standards:

• Encryption

• Signing

• Authentication via certificate and user accounts

• Note:

Security mechanisms have a negative effect on performance, especially when establishing a connection. While operating, performance is reduced by approx. 10%.

User Accounts

• The configuration of user accounts is analogue to the web server.

• The configuration is mostly self-explanatory

Certificates

• The management of the certificates must be coordinated in detail with

the IT department

• In many cases, certificates are managed centrally by the IT

department, which increases the consulting effort massivel

• Simple example:

S7-1500 and Third Party Client with self-signed certificates

• Consulting intensive example:

Integration into existing IT infrastructure with certificate generation by Microsoft Active Directory

AD Server

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Guideline 5: Standards via information models (Companion Specifications)

Predefined and simple customized models

• The integration of predefined models (e.g. Euromap 77) can be done

with SiOME according to the application example.

• Simple interfaces can also be created with SiOME by following the

instructions.

Application example for SiOME:

https://support.industry.siemens.com/cs/au/en/view/109755133

Creating companion specifications and customer-specific standards

• Creating full Companion Specifications requires in-depth knowledge of

the OPC UA standard. Cross-industry Companion Specifications (e.g. PackML or Euromap77)

are therefore created in respective expert circles.

• Furthermore, each specification must be checked for compatibility with

the S7-1500.

• For major standardizations, discuss with Siemens

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Guideline 6: Use Case: Monitoring via HMI

Monitoring via OPC UA Subscriptions

• The definition of the subscriptions should be aligned with the

display mechanisms.

(Avoiding unnecessary communication )

• Only variables that are displayed should be activated.

(Switching between modes „Disabled“ and „Reporting“)

• Subscriptions should be created during connection setup and

changed as little as possible during runtime.

(communication load due to log-on procedures)

• Data should be divided into different update cycles(e.g. 1s and

5s)

(Each cycle then represents a subscription with one or more monitored items)

Image 1

(Conveyor)

Image 2

(Machine)

Optimizing through structured data storage is essential

(Especially for larger quantity structures, see guideline 1)

Conveyor. Status

Machine, Status

Conveyor. Speed

Machine. Speed

Active

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Guideline 7: Use Case: Connection to overlaid systems

Usage of OPC UA client functions

• Data transfer is initiated by PLC

(e.g. machine actively requests order at MES)

Usage of OPC UA server functions

• Data transfer is initiated by the overlaid system

(e.g. operator changes a parameter on SCADA)

Usage of OPC UA methods

• Data consistency is required (e.g. recipes, quality data)

• The overlaid system starts a program sequence in the PLC.

(e.g. controlled start or stop of the machine)

SCADA

MES

Feature set of server and client have to be aligned

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Guideline 8: Use Case: Communication between several S7-1500

Read / Write access

• If data consistency is not required, read/write mechanisms are

sufficient.

(e.g. monitoring of machine status at the line controller)

• Access by the S7-1500 OPC UA Client is always registered

according to PLC open specification.

(Third Party Clients can also access the S7-1500 OPC UA Server unregistered)

Methods

• For consistent data transfer it is recommended to use OPC UA

methods

(e.g. transfer of production data between two machines)

Line Controller

Machine

Controller

Machine

Controller

Transmit ProductData ()

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Practical example 1: Using OPC UA as communication standard to Third Party SCADA

Requirements

• OPC UA is designed to be used as communication standard

between PLC and SCADA

• The number of single variables significantly exceeds the

subscription quantity structure of 10000 monitored elements (see data sheet SIMATIC CPU 1518)

Siemens OPC UA User manual

Specifications and Main Features

Frequently Asked Questions

User Manual