Weihenstephan standards
| Weihenstephan standards
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| Basic data
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| developer | Technical University of Munich - Chair for Food Packaging Technology |
| category | Machine interface |
| weihenstephaner-standards.de/ | |
The Weihenstephaner Standards (WS) are interfaces for machine data acquisition . They connect machines for packaging and filling technology (WS Pack) or the food industry (WS Food) with higher-level systems such as production data acquisition systems ( BDE ) or Manufacturing Execution Systems ( MES ). The Weihenstephan standards define the physical interface, a proprietary command set, a machine-specific data offer and the utilization / processing of the data points.
history
The Weihenstephan standards were based on a research project that was supported by the Science Funding of the German Brewing Industry (Wifö). The result was the "standard specification for PDA systems within beverage filling lines". In the following years, a group of industrial users, consisting of machine builders, IT providers, control manufacturers and end users, defined the Weihenstephan standards for operating data acquisition in beverage filling and packaging systems (WS2005.05). This project was also financed by Wifö. Later, on the initiative of the meat processing industry, the WS Food project was founded, which aimed to adapt the beverage standard to the food processing industry; this is how WS Food was born.
description
The Weihenstephan standards can be located in the automation pyramid as a link between the production management level and the process control level. They were developed for packaging and filling technology as well as for the food industry. They allow an MES or PDA system to exchange data with the controls of various machines and thus support MES functionalities. For easy processing of the data are
- a uniform physical interface
- a uniform instruction set and
- a uniform database is necessary.
In addition, industry-specific reports and evaluation functions are presented as examples in the Weihenstephan Standards and the generation with the specified data basis is explained. The WS offers the following documents:
| Filling and packaging technology | Food production | Explanation |
|---|---|---|
| WS information brochure | WS information brochure | Information about the WS |
| WS protocol | WS protocol | Description of the data interface |
| WS pack content | WS Food content | Description of the data content in a data point library (industry-specific) |
| WS pack evaluation | WS Food evaluation | Description of standard evaluation functions (industry-specific) |
| WS review | WS review | Description for checking the interface (in progress) |
Definitions
Communication interface
| OSI layer | English | Weihenstephan standard | |
|---|---|---|---|
| 7th | application | Application | Standardized applications |
| 6th | presentation | Presentation | Binary data transfer in Intel format |
| 5 | meeting | session | Standardized instruction set |
| 4th | transport | transport | TCP |
| 3 | network | Network | IP |
| 2 | Fuse | Data link | CSMA / CD |
| 1 | Bit transfer | Physical | Ethernet |
Communication is based on the client / server principle, whereby the MES as a client sends requests to a machine (server) and receives responses from it. The interface is physically based on Ethernet . The protocol used is TCP / IP with WS-proprietary commands. The following commands are available, whereby only 1–3 must be supported:
| No | command | Explanation |
|---|---|---|
| 1 | NOOP | No function (sign of life) |
| 2 | READ_SVALUE | Reading a value |
| 3 | WRITE_SVALUE | Writing a value |
| 4th | READ_LIST | Reading a defined list |
| 5 | WRITE_LIST | Writing a defined list |
| 6th | READ_MVALUE | Reading multiple values |
| 7th | WRITE_MVALUE | Writing multiple values |
| 8th | READ_STRING | Reading a string |
| 9 | WRITE_STRING | Write a string |
| 10 | READ_CONFIG | Reading the device description file |
| 11 | READ_MIXED_LIST | Reading mixed values (with string) |
| 12 | WRITE_MIXED_LIST | Writing mixed values (with string) |
The interface can be checked with a test tool. This was developed in cooperation with Krones AG and can be used to validate the interface.
Data content
In the WS Pack, data content for machines in filling and packaging technology and in WS Food for the food industry are defined. There are industry-specific data point libraries in each of which contain relevant data points and are clearly explained. A distinction is made between
- Mandatory data points that a machine must provide
- optional data points that a machine can provide and
- additional data points that the machine manufacturer can define himself (these are not contained in the libraries).
All data points have a fixed number, a unique name, a data format, access rights and a description.
Interface description
The interface of a machine must be described using the so-called XML device description file. It documents the supported commands, the available data points and connection properties (port number, number of connections, etc.). The file must correspond to the current scheme and can be created and edited with the WSEdit tool, which was developed in cooperation with KHS GmbH .
Evaluation functions
For the decision-supporting use of data acquisition systems, relevant information is of interest, not extensive databases. Information that supports decision-making can be obtained through compression and automated evaluation of the data. In its third part, the Weihenstephaner Standards recommend the most important evaluation functions for the respective industry, such as
- Internal batch tracking
- Efficiency analysis based on meaningful key figures (e.g. OEE , OPI)
- Weak point analysis
- Process data visualization
It explains how information can be generated and displayed using the WS data points.
harmonization
When developing the Weihenstephan standards, attention was paid to the integration of existing standards and related standardization efforts were pursued. A harmonization with two documents of the Packaging Workgroup of OMAC with regard to
- Data point naming "Tag Naming Guidelines (PackML V3.0)" and
- a status model "Machine Language V3.0 Mode & State Definition Document" can be achieved. Since the Weihenstephan standards version 2005.04, these have been part of ISA-TR88.00.02 and there as "Weihenstephan Mode" an application example of the OMAC guidelines.
See also
literature
- Kather, A .; Voigt, T .: Weihenstephaner standards for production data acquisition in beverage filling and packaging systems V2005.06, 2011, Technical University of Munich - Chair for Food Packaging Technology
- Kather, A .; Voigt, T .: Vertical integration of beverage filling systems based on standardized interfaces. PPS Management Edition 13/2008, pp. 40–43
- Voigt, T .; Kather, A .: Weihenstephan standards for PDA systems. Beverage industry edition 09/2005, pp. 158–161, (PDF; 384 kB)
- Wenning, M .: Production controlling in filling and packaging - line operation under the microscope. IT & Production, Edition 05/2011, (PDF; 116 kB)
Web links
- Weihenstephan Standards website
- Standard interface WS Food - cross-machine data transparency in meat and sausage processing
- Article at BMWI, December 23, 2011. Retrieved December 23, 2011
- Process technology online, December 23, 2011. Accessed November 23, 2011 ;
Individual evidence
- ↑ Science Funding of the German Brewing Industry eV: Standard specifications for BDE systems within beverage filling lines, publisher: Society for Public Relations of the German Brewing Industry eV, 1999. http://www.brauerbund.de
- ↑ OMAC Packaging Working Group, PackML Subcommittee: Tag Naming Guidelines (PackML V3.0), 2006.
- ↑ OMAC Packaging Working Group, PackML Subcommittee: Machine Language V3.0 Mode & State Definition Document (PackML V3.0), 2006.
- ↑ ISA: ISA-TR88.00.02-2008 Machine and Unit States: An Implementation Example of ISA-88, 2008