BS EN 61784-1-2014 pdf download.Industrial communication networks – Profiles Part 1 : Fieldbus profiles.
5.2.2.2.2.13 IEC 61158-4-1, 6.7.2.1
When the first address is a group DL-address as in IEC 61158-4-1, 6.7.2(a), then
a) If the DLPDU format is format 1L or is, then
1) the DLPDU is being used to implement the unitdata transfer service,
2) the DL(SAP)-role for the source DLSAP-address shall be BASIC,
3) the SD-parameters field shall be null, and
4) the user data shall be a single DLSDU whose size is limited to the maximum size for the priority specified in IEC 61158-4-1, 6.7.1.1(b). and shall not be null.
b) No other DLPDU format may be used.
When the addresses are DLSAP-addresses as In IEC 61158-4-1, 6.7.2(b), then
c) If the DLPDU format is format 1L or IS, then
1) this DLPDU is being used to implement the unitdata transfer service,
2) the DL(SAP)-role for the destination DLSAP-address shall be BASIC,
3) the DL(SAP)-role for the source DLSAP-address shall be BASIC,
4) the SD-parameters field shall be null, and
5) the user data shall be a single DLSDU whose size is limited to the maximum size for the priority specified in IEC 61158-4-1. 6.7.1.1(b). and shall not be null.
d) not included
e) No other DLPDU format may be used.
5.2.2.2.2.14 IEC 61158-4-1, 6.7.2.2
When the first address is a DLCEP-address, as in IEC 61158-4-1, 6.7.2(c), then
a) this DLPDIJ can convey a single DLSDU
1) from one peer DLCEP to Its corresponding peer DLCEP, or
2) from a publisher DLCEP to Its corresponding subscriber DLCEPs.
and
b) the second address, if present, shall be the peer DLCEP-address of the same DLC as the destination DLCEP-address:
c) the SD-parameters field shall specify state information for the addressed OLCEP, and the contents of this field shall be as described in IEC 61158-4-1, 9.4.2; and
5.2.2.2.2.15 IEC 61158-4-1, 6.7.3.0
A OT DLPDU may be selected for transmission on the link when the sending OLE
a) has just received a reply token in a CD DLPDU, permitting a single transmission of a DT or SR DLPDU, or
b) holds a scheduler token or delegated token which is the dominant token on the local link, and when the remaining allocated duration of token usage, C(RD), permits completion of the DT DLPDUs transmission prior to expiration of the token.
Each explicit DL-address in the DLPDU shall be delocalized IEC 61158-4-1. 5.2.2.4 before transmission.
5.2.2.2.2.16 IEC 61158-4-1, 6.7.3.1
NOTE 1 Only CD DI9DU with pubbeher’s DLCEP-address as destination address is included.
a) A OT DLPDLJ may be sent on the link when the sending OLE has received a CO DLPDU addressed to one of its active OLCEP-addresses for which it has a publisher DLCEP, and the sending OLE is replying as specified by IEC 61158-4-1. 6.5.4.1. by forming as an immediate reply a DT DLPDLJ which may include a DLSDU which was already buffered at that responding OLE at the time of the CD DLPDUs reception.
When an immediate reply to a CD DLPDU is required, as specified in (a). then the replying OLE shall send a reply OT DLPDU within a period of maximum-response-delay slot-times, V(MRD) x V(ST) octet-durations, of receipt of the requesting CD DLPDU.
The final-token-use subfield of the reply DT DLPDU shall have the same value as that in the requesting CD DLPDU.
Each explicit DL-address In the reply OT DLPDU shall be delocalized IEC 61158-4-1, 5.2.2.4 before transmission.
It is a protocol error for the addressed OLE to not send a DT reply OLPOU when a rep’y is required.
At most one OLE on the local link should be sending a reply to the received CD DLPDU. That reply shall be a DT OLPDU.
5.2.2.2.2.17 IEC 61158-4-1, 6.7.4.0
Each DL-address in the DLPDU shall be delocalized IEC 61158-4-1. 5.2.2.4 upon reception. A received DT DLPDU shall be treated as follows by the receiving OLE.BS EN 61784-1-2014 pdf download.

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