IEC PAS 62412:2005 pdf download Real-time Ethernet P-NET on IP specification
Scope and object
This PAS consists of paragraphs that are meant to be additiona to the definitions andspecifications, which are already found in the lEC 61158 series. Following each headingthere will be a reference to which paragraph must be inserted or replaced within the relevantIEC 61158 series.
After the modifications to lEC 61158 series a few descriptions explain how to perform addressconversions and handle dynamic clients.
NOTE These descriptions are more implementation specific and will not be included in the normative parts of thenew standard
2 Normative references
The following referenced documents are indispensable for the application of this documentFor dated references, only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.
EC 61158-2:2003,Digital data communications for measurement and control – Fieldbus foruse in industrial control systems – Part 2: Physical laver specification and service definition
EC 61158-4:2003,Digital data communications for measurement and control – Fieldbus foruse in industrial control systems – Part 4: Data link protocol specification
SO/IEC 8802-3，Information technology – Telecommunications and information exchangebetween systems – Local and metropolitan area networks – Specific requirements – Part 3Carrier sense multiple access with collision detection (CSMA/CD) access method andphysical layer specifications
RFC 768(UDPUser Datagram Protocol)RFC 791 (IPInternet Protocol)
3Conventions
This PAS specifies paragraphs that shall either be replaced or added to the lEC 61158 seriesParagraphs that shall be replaced are indicated with the paragraph number(s) in question asreference and begin and end with the lines as shown:
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modified text
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Paragraphs that shall be added are indicated with first paragraph number(s) to add and begin and end with the lines as shown:
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new text
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4 61 158-2 Physical Layer specification
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ISO/IEC 8802-3 shall be used.
4.1 OSI Data Link Layer
4.1 .1 MAC sublayer
ISO/IEC 8802-3 shall be used.
4.1 .2 LLC sublayer
ISO/IEC 8802-3 shall be used.
4.2 OSI Network layer
Internet standard RFC 791 (IP, Internet protocol) and its amendments and successors shall be used.
4.3 OSI Transport layer
Internet standard RFC 768 (UDP, User Datagram Protocol) and its amendments and successors and the Data Link Layer protocol specification within this document shall be used.
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5 61 158-4 Data Link Layer protocol specification
5.1 Terms and definitions
5.1 .1 P-NET-route
The following term is to be replaced in 3.7.8, Type 4: Additional terms and definitions:
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A P-NET route holds a sequence of P-NET-route-elements.
NOTE A P-NET-route is defined as an encoded DL-route, with one of the formats used when transmitting the DLPDU on the Link. The P-NET-route format can be Simple, Extended, Complex, Immediate or IP.
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5.2 Additions to terms and definitions
The following terms are to be added in paragraph 3.7, Type 4: Additional terms and definitions:
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5.2.1 IPNetTable
An IpNetTable defines the relation between IPNetID, IP address, UPD port number and Router NodeAddress, where IPNetID is used as index in the table.
5.2.2 IPNetID
IPNetID identifies a unique IP network. The value of IPNetID shall be in the range of 0-1 27.
The values 0, 1 26 and 1 27 are reserved for special purposes.
NOTE An IPNetID is translated into an IP-address and a UPD port number.

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