International Standards and Conformity Assessment for all electrical, electronic and related technologies



Reference EN 61158-4-2:2012
Title Industrial communication networks - Fieldbus specifications - Part 4-2: Data-link layer protocol specification - Type 2 elements
Project Number 22480
Abstract/Scope IEC 61158-4-2:2010(E) describes the protocol that provides communication opportunities to all participating data-link entities, sequentially and in a cyclic synchronous manner. Foreground scheduled access is available for time-critical activities together with background unscheduled access for less critical activities. Deterministic and synchronized transfers can be provided at cyclic intervals up to 1 ms and device separations of 25 km. This performance is adjustable dynamically and on-line by re-configuring the parameters of the local link whilst normal operation continues. By similar means, DL connections and new devices may be added or removed during normal operation. This protocol provides means to maintain clock synchronization across an extended link with a precision better than 10 s. This second edition cancels and replaces the first edition published in 2007 and constitutes a technical revision. The main changes with respect to the previous edition are: -Clause 2 and Bibliography: update of normative and bibliographic references; - subclause 3.5: update of abbreviations; - subclause 7.6: updates of the Ethernet Link object; - subclause 7.7: minor update of the Devicenet object (additional attribute); - new subclauses 7.9 and 7.10: new DLR and QoS objects; - new Clause 10: new DLR protocol.


Current Stage code 6060
Current Stage code date 2012-05-25
Current Stage code deadline 2012-12-28
Deadline date for vote  


Mandate(s) M/490
Order Voucher  


IEC Technical Body IEC/SC 65C
Reference Document IEC 61158-4-2:2010 (EQV)
ICS 25.040.40 - Industrial process measurement and control
35.100.20 - Data link layer
35.110 - Networking
Keywords Industrial; Communication; Network; Fieldbus; Data link layer
Note Project launched as FprEN 61158-400 and ratified as EN 61158-4-2 - Initial project split into 9 subparts i.e. EN 61158-4-2, 3, 11, 12, 14, 18, 19, 21 and 22 * Supersedes EN 61158-4-2:2008
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 2012-05-25 2012-12-28 export to doc file  EN  DE
5099 2012-03-28 2012-05-28  
5060 2010-07-05 2010-07-19 export to doc file  EN
5020 2010-04-30 2010-07-02  
3090 2009-11-20 2010-03-31  
5060 2009-11-10 2009-11-24 export to doc file  EN
5020 2009-06-05 2009-11-06  
1090 2009-06-02 2009-06-05  

Implementation Dates

date of Ratification (DOR) (1) 2012-03-28
date of Availability (DAV) (2) 2012-05-25
date of Announcement (DOA) (3) 2012-06-28
date of Publication (DOP) (4) 2012-12-28
date of Withdrawal (DOW) (5) 2015-03-28


Supersedes EN 61158-4-2:2008
Superseded by  
Normative reference (6) IETF RFC 1213:1991
IEEE 802.1Q:2005
IEEE 802.1D:2004
ISO/IEC 3309
ISO/IEC 7498-1
ISO/IEC 7498-3
ISO/IEC 8802-3
ISO 11898:1993
EN 61131-3
EN 61158-3-2:2008
EN 61158-5-2:2012
EN 61158-6-2:2012
IEC 61588:2009
EN 61784-3-2
EN 62026-3:2009

(1) Date of ratification (dor) date when the Technical Board notes the approval of an EN (and HD for CENELEC), from which time the standard may be said to be approved

(2) Date of availability (dav) date when the definitive text in the official language versions of an approved CEN/CENELEC publication is distributed by the Central Secretariat

(3) Date of announcement (doa) latest date by which the existence of an EN (and HD for CENELEC), a TS or a CWA has to be announced at national level

(4) Date of publication (dop) latest date by which an EN has to be implemented at national level by publication of an identical national standard or by endorsement

(5) Date of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn

(6) This list of normative references is purely indicative. The only official list of normative reference is the list of the published standard.