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Abort (ABT)

The service Abort is mandatory. It permits the release of a logical LLI connec-

tion. Execution of the services DTC and DTA is only permissible after a new con-

nection establishment.

Table 5. Abort

+--------------------------------------+-----+-----+

! ! ! !

! Parameter Name !.req !.ind !

+--------------------------------------+-----+-----+

! Argument ! M ! M !

! Communication Reference ! M ! M !

! LLI SAP ! M ! M !

! Locally Generated ! ! M !

! Identifier ! M ! M !

! Reason Code ! M ! M !

! Additional Detail ! C ! C !

+--------------------------------------+-----+-----+

Argument

The argument contains the parameters of the ABT.req and ABT.ind primitives.

Communication reference

The parameter specifies the identifier of the associated connection in the LLI

CRL.

LLI SAP

The parameter specifies the LLI service access point over which the service is

executed.

Locally Generated

The parameter shall indicate whether the Abort was initiated by the local LLI

(local) or by the communication partner (remote).

Identifier

The parameter shall indicate where the reason for the connection abort was iden-

tified (user, LLI user, LLI or Layer 2).

Reason-Code

The parameter specifies the reason for the connection abort.

Additional Detail

The parameter depends on ID and RC. It contains additional information about the

connection release.

Execution of the Abort service at the LLI user - LLI interface (the service

primitives are abbreviated as ABT.xxx).

Requester: Receiver:

LLI User LLI LLI LLI User

==================!======= =======!======================

! !

ABT.req ! ! ABT.ind

<CREF, LLI SAP, ! ! <CREF, LLI SAP,

ID, RC, AD> ! ! LG, ID, RC, AD>

----------------->!-- --!--------------------->

! !

Figure 26. ABT Sequence

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6.2.5 Interface between LLI and FMA7 for local functions

In this clause the services and their parameters at the interface between FMA7

and LLI are specified.

Overview of Services

The LLI provides the following services at the interface to FMA7:

- LLI-Reset : reset of the LLI

- LLI-Fault : error notification of the LLI

Optionally, the LLI may additionally provide the following services at the in-

terface to FMA7:

- LLI-Disable : disabling of the LLI

- LLI-Load-CRL : loading of the LLI CRL

- LLI-Read-CRL : reading of the LLI CRL

- LLI-Enable : enabling of the LLI

- LLI-Ident : identification of the LLI

LLI-Reset

The service LLI Reset is mandatory. With a LLI Reset.req primitive the FMA7

causes a restart of the LLI as at power-on. This service is always permissible,

independently of the current LLI state. Immediately after receiving a LLI Re-

set.req primitive the LLI issues a LLI Reset.con primitive to the FMA7 which in-

dicates the beginning of the restart.

Table 6. LLI-Reset

+--------------------------------------+-----+-----+

! ! ! !

! Parameter Name !.req !.con !

+--------------------------------------+-----+-----+

! Argument ! M ! !

! ! ! !

! Result ! ! M !

+--------------------------------------+-----+-----+

Argument

The argument contains no parameters.

Result

This parameter shall indicate that the LLI-Reset service has been executed.

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LLI-Disable

The service LLI-Disable is optional. With the LLI-Disable service the LLI is

disabled for data communication on all communication relationships with the ex-

ception of the management connection (CREF 1). All currently established connec-

tions with the exception of the management connection shall be released.

After receiving a LLI-Disable.req primitive the LLI cancels all LLI state ma-

chines related to the CREF and associated services, except for the management

CREF machines (see connection establishment definition). Subsequently, the LLI

deactivates all activated LSAPs (0, 2 to 63, NIL). Then the LLI state changes to

LLI-DISABLE (see start of LLI definition) and a LLI-Disable.con primitive is is-

sued to FMA7.

Table 7. LLI-Disable

+--------------------------------------+-----+-----+

! ! ! !

! Parameter Name !.req !.con !

+--------------------------------------+-----+-----+

! Argument ! M ! !

! ! ! !

! Result ! ! M !

+--------------------------------------+-----+-----+

Argument

The argument contains no parameters.

Result

This parameter shall indicate that the LLIDisable service has been executed.

LLI-Load-CRL

The service LLI-Load-CRL is optional. The FMA7 delivers the LLI CRL header or

the static part of a LLI CRL entry to the LLI with the service LLI Load CRL (see

LLI CRL definition). At the time of delivery of the LLI-Load-CRL.req primitive

the LLI shall be in the state LLI-DISABLE or in the state LOADING-CRL (see LLI

state machine definition). After the execution of the service the LLI issues a

LLI-Load-CRL.con primitive to FMA7.

Table 8. LLI Load CRL

+--------------------------------------+-----+-----+

! Parameter Name !.req !.con !

+--------------------------------------+-----+-----+

! Argument ! M ! !

! LLI CRL Header ! S ! !

! LLI CRL Entry ! S ! !

! ! ! !

! Result(+) ! ! S !

! ! ! !

! Result(-) ! ! S !

! Error Type ! ! M !

+--------------------------------------+-----+-----+

Argument

The argument contains the parameters of the LLI-Load-CRL.req primitive.

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LLI CRL header

This parameter contains the header of the LLI CRL.

LLI CRL entry

This parameter contains the static part of a LLI CRL entry.

Result(+)

The result(+) parameter shall indicate that the LLI-Load-CRL service was exe-

cuted successfully.

Result(-)

The result(-) parameter shall indicate that the LLI-Load-CRL service failed. In

this case neither the LLI header, nor a LLI CRL entry is written into the LLI

CRL.

Error Type

This parameter contains information on why the LLI-Load-CRL service failed. The

parameter may take the following values:

Table 9. Error Codes

+------+--------------------------------------------------------+

! Code ! Meaning !

+------+--------------------------------------------------------+

! LR ! Service could not be executed, as resources not !

! ! sufficient !

! SC ! Service not allowed in this state (state conflict) !

! IV ! Parameter error (static part of the LLI CRL Entry !

! ! invalid). !

+------+--------------------------------------------------------+

LLI-Enable

The service LLI-Enable is optional. The loading of the LLI CRL shall be termi-

nated with the service LLI-Enable. This service is only permitted in the state

LOADING-CRL.

Upon receipt of a LLI-Enable.req primitive in the state LOADING-CRL the LLI re-

quests the necessary resources to create the dynamic part of the LLI CRL (see

LLI CRL definition). If the necessary resources are present, the LLI initializes

the dynamic part of the LLI CRL. Then the LLI issues a LLI-Enable.con (R+) to

FMA7. If the service failed, the LLI changes the current state to LLI-START and

issues an LLI-Enable.con (R-) to FMA7. In this case the LLI remains disabled for

data communication on all communication relationships with the exception of the

management connection (CREF 1).

Table 10. LLI Enable

+--------------------------------------+-----+-----+

! ! ! !

! Parameter Name !.req !.con !

+--------------------------------------+-----+-----+

! Argument ! M ! !

! ! ! !

! Result(+) ! ! S !

! ! ! !

! Result(-) ! ! S !

! Error Type ! ! M !

! Error CREF ! ! C !

+--------------------------------------+-----+-----+

Argument

The argument contains no parameters.

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Result(+)

The result(+) parameter shall indicate that the LLI-Enable service was executed

successfully.

Result(-)

The result(-) parameter shall indicate that the LLI-Enable service failed.

Error Type

This parameter contains information on why the LLI-Enable service failed. The

parameter may take the following values:

Table 11. Error Codes

+------+--------------------------------------------------------+

! Code ! Meaning !

+------+--------------------------------------------------------+

! LR ! Service could not be executed, as resources not !

! ! sufficient !

! SC ! Service not allowed in this state (state conflict) !

! IV ! no valid CRL available (CRL invalid) !

+---------------------------------------------------------------+

Error CREF

The parameter specifies at which CREF the LLI-Enable service was aborted by the

LLI. The parameter is only present for the Error Type = LR.

LLI-Read-CRL

The service LLI-Read-CRL is optional. The LLI CRL header or a LLI CRL entry

(subset of the static and dynamic part of the LLI CRL) shall be read with the

service LLI-Read-CRL. The communication reference 0 shall be used to read the

LLI CRL header. The corresponding communication reference shall be given to read

a LLI CRL entry. If this communication reference is not in use, the service re-

turns LLI-Read-CRL.con(R-).

Table 12. LLI-Read-CRL

+--------------------------------------+-----+-----+

! Parameter Name !.req !.con !

+--------------------------------------+-----+-----+

! Argument ! M ! !

! Communication Reference ! M ! !

! ! ! !

! Result(+) ! ! S !

! LLI CRL Data ! ! M !

! ! ! !

! Result(-) ! ! S !

! Error Type ! ! M !

+--------------------------------------+-----+-----+

Argument

The argument contains the parameters of the LLI-Read-CRL.req primitive.

Communication reference

The value 0 shall be given here to read the LLI CRL header. For reading the LLI

CRL entry this parameter specifies the communication reference of the LLI CRL

entry.

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Result(+)

The result(+) parameter indicates that the LLI-Read-CRL service was executed

successfully.

LLI CRL Data

This parameter contains the LLI CRL header or a subset of the LLI CRL entry.

If the parameter contains the LLI CRL header, the structure and the meaning are

specified as in the LLI CRL structure definition (Structure of the LLI CRL).

If the parameter contains a subset of a LLI CRL entry with CREF > 0, the struc-

ture is as follows:

Static Part: Dynamic Part:

+-----+---------------------+ +------+----------------------+

! ! CREF ! !MANDA-! Status !

! M +---------------------+ ! TORY ! !

! A ! Local LSAP ! +------+----------------------+

! N +---------------------+ ! ! Actual Remote Address!

! D ! Remote Address ! ! C +----------------------+

! A +---------------------+ ! O ! Actual Remote LSAP !

! T ! Remote LSAP ! ! N +----------------------+

! O +---------------------+ ! D ! SCC !

! R ! LLI Context ! ! I +----------------------+

! Y +---------------------+ ! T ! RCC !

! ! LLI SAP ! ! I +----------------------+

+-----+---------------------+ ! O ! SAC !

!CON- ! CCI ! ! N +----------------------+

! +---------------------+ ! A ! RAC !

!DITI-! Multiplier ! ! L +----------------------+

! +---------------------+ ! ! Poll Entry Enabled !

!ONAL ! Connection Attribute! +------+----------------------+

+-----+---------------------+

Figure 27. Structure of the excerpt from the LLI CRL Entry (Structure of the

LLI CRL)

The meaning of the individual attributes corresponds to the specifications in

the LLI CRL structure definition.

Result(-)

The Result (-) parameter indicates that the service LLI-Read-CRL failed.

Error Type

This parameter contains information on why the LLI-Read-CRL service failed. The

parameter may take the following values:

Table 13. Error Code

+------+-------------------------------------------------+

! Code ! Meaning !

+------+-------------------------------------------------+

! NE ! LLI CRL entry not available (non existent) !

+------+-------------------------------------------------!

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LLI-Ident

The service LLI-Ident is optional. It permits FMA7 to request vendor and release

of the LLI software and controller type and release of the LLI hardware.

After receiving the LLI-Ident.req primitive the LLI issues the requested identi-

fication report to FMA7.

Table 14. LLI-Ident

+--------------------------------------+-----+-----+

! Parameter Name !.req !.con !

+--------------------------------------+-----+-----+

! Argument ! M ! !

! ! ! !

! Result ! ! M !

! Vendor Name ! ! M !

! Software Release ! ! M !

! Controller Type ! ! M !

! Hardware Release ! ! M !

+--------------------------------------+-----+-----+

Argument

The argument contains no parameters.

Result

The Result parameter shall indicate that the LLI-Ident service was executed.

Vendor Name

This parameter states the vendor name of the LLI software.

Software Release

This parameter states the revision of the LLI software.

Controller Type

This parameter states the vendor and the hardware, on which the LLI is imple-

mented.

Hardware Release

This parameter states the revision of the hardware on which the LLI is imple-

mented.

LLI-Fault

The Service LLI-Fault is mandatory. It is used by the LLI to indicate a fatal

error to FMA7.

Table 15. LLI-Fault

+--------------------------------------+-----+

! Parameter Name !.ind !

+--------------------------------------+-----+

! Argument ! M !

! Communication Reference ! M !

! Reason Code ! M !

! Additional Detail ! C !

+--------------------------------------+-----+

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Argument

The argument contains the parameters of the LLI-Fault.ind primitive.

Communication reference

This parameter specifies the identifier of the related communication reference

in the LLI CRL.

If an error cannot be assigned to a CREF, the value NIL shall be given here.

Reason Code

This parameter contains the error number. The values of the reason codes are

specified in the formal LLI state machine definition.

Additional Detail

This parameter depends on the Reason Code and contains additional details about

the reason of error.

6.2.6 LLI Communication Relationship List (LLI CRL)

The Communication Relationship List (CRL) of a station shall contain the de-

scription of all communication relationships to the other PROFIBUS stations in-

dependent of the time of usage. The CRL is created individually for every

PROFIBUS station at the time of configuration. It is loaded with network manage-

ment services (FMA7) or it is locally present. Every CRL entry completely de-

scribes a communication relationship. An entry is uniquely selected by the com-

munication reference (CREF).

That part of the CRL which is relevant for the LLI is called LLI CRL. The LLI

CRL contains the assignments between the communication references (CREF), the

addressing of Layer 2 and that of LLI. Moreover, the communication contexts, the

control mechanisms etc. are configured in the LLI CRL.

6.2.6.1 Structure of the LLI CRL

The LLI CRL consists of a header, a static and a dynamic part.

The header of the LLI CRL contains information about the number of the LLI CRL

entries, the control interval for the connection establishment and release and,

if required, the Poll List LSAP. The LLI CRL header is stored at CREF 0.

The static part is defined during configuration and describes the static attrib-

utes of a communication reference. The static part of the LLI CRL may be located

in a ROM.

The dynamic part of the LLI CRL contains the dynamic attributes of a connection.

This part is controlled only by the LLI and shall be located in a random access

memory. Some attributes in the dynamic part of the LLI CRL may be omitted or re-

main unused depending of the type of communication reference.

! mandatory ! conditional !

+--------+-------------------+------------+----------------+

! CREF 0 ! Number of LLI CRL ! ASS/ABT CI ! Poll List LSAP !

! ! Entries ! ! !

+--------+-------------------+------------+----------------+

Figure 28. Structure of the LLI CRL Header

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Meaning of the attributes of the LLI CRL headers:

Number of LLI CRL Entries

It specifies the number of entries in the LLI CRL. The CREFs of the entries

starts with CREF 2 and shall be continued in sequence without gaps. The CREF 1

shall be additionally configured in the CRL if the station supports remote man-

agement functions as a server (the default management connection is configured

in the server at CREF 1).

ASS/ABT-CI

It contains the time interval for the control of the connection establishment

and connection release.

Poll List LSAP

It specifies the local Service Access Point of the Layer 2 which contains the

Poll List. It is only necessary to specify this parameter at master stations

which have connections for cyclic data transfer to master or slave stations, or

connections for acyclic data transfer to slave stations. This attribute may take

the values 0, 2 to 62 and NIL. The description and the structure of the static

part of the LLI CRL (entries) is shown below.

+==+======+================================+======+==//==+======+

! ! ! CREF ! ! ! !

! ! M +--------------------------------+------+--//--+------+

! ! ! Local LSAP ! ! ! !

! ! A +--------------------------------+------+--//--+------+

! ! ! Remote Address ! ! ! !

! ! N +--------------------------------+------+--//--+------+

! ! ! Remote LSAP ! ! ! !

!S ! D +----------+---------------------+------+--//--+------+

! ! ! ! for high prior PDU ! ! ! !

! ! A ! M a x ! to be sent ! ! ! !

!A ! ! +---------------------+------+--//--+------+

! ! T ! ! for low prior PDU ! ! ! !

! ! ! ! to be sent ! ! ! !

!T ! O ! L_sdu +---------------------+------+--//--+------+

! ! ! ! for high prior PDU ! ! ! !

! ! R ! ! to be received ! ! ! !

!I ! ! +---------------------+------+--//--+------+

! ! Y ! Lengths ! for low prior PDU ! ! ! !

! ! ! ! to be received ! ! ! !

!C ! +----------+---------------------+------+--//--+------+

! ! ! LLI Context ! ! ! !

! ! +--------------------------------+------+--//--+------+

! ! ! LLI SAP ! ! ! !

! +------+--------------------------------+------+--//--+------+

! ! ! CCI ! ! ! !

! ! +--------------------------------+------+--//--+------+

! !CONDI-! Multiplier ! ! ! !

! ! +--------------------------------+------+--//--!------+

! !TIONAL! Connection Attribute ! ! ! !

! ! +--------------------------------+------+--//--+------+

! ! ! Max Length for low prior ! ! ! !

! ! ! LLI User PDU to be received ! ! ! !

+==+======+========+=======================+======+==//==+======+

Figure 29. Structure of the LLI CRL (Entries), static Part

Meaning of the attributes in the static part of the LLI CRL:

CREF (Communication reference)

The CREF specifies a locally unique identifier for the communication reference.

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Local LSAP

Specifies the local Service Access Point of Layer 2, which shall be used for

this communication reference. The range of values for this attribute is shown in

the following table. On connections for cyclic data transfer or master-slave

connections for acyclic data transfer the Poll List LSAP shall be configured for

this attribute in the LLI CRL of the master (see header of LLI CRL). For cyclic

connections between two masters, that master which has not configured the Poll

List SAP for this attribute shall emulate the slave.

Remote Address

It states the FDL address (Rem_add) of the remote station for this CREF. The

range of values for this attribute is shown in Table 92.

Remote LSAP

It states the destination Service Access Point of the Layer 2. The range of val-

ues for this attribute is shown in table below.

Table 16. Range of Values for the Layer 2 Addressing

+=======+=======+=======+=======+=======+=======+==========+

! ! ! ! ! ! ! !

! 1) ! 2) ! 3) ! 4) ! 5) ! 6) ! 7) !

! ! ! ! ! ! ! !

!=======!=======!=======!=======!=======!=======!==========!

! !

! range of values for the attribute Local LSAP !

! !

! 0, 2 ! 0, 2 ! 0 ! 0, 2 ! ! 0, 2 ! 0, 2 !

! to ! to ! to ! to ! ! to ! to !

! 62, ! 62, ! 62, ! 62, ! 63 ! 62, ! 62, !

! NIL ! NIL ! NIL ! NIL ! ! NIL ! NIL !

!-------!-------!-------!-------!-------!-------!----------!

! !

! range of values for the attribute Remote Address !

! !

! 0 ! 0 ! 0 ! ! 0 ! ! 0 !

! to ! to ! to ! ! to ! ! to !

! 126 ! 126, ! 126, ! 127 ! 126, ! 127 ! 126, !

! ! All ! All ! ! All ! ! All !

!-------!-------!-------!-------!-------!-------!----------!

! !

! range of values for the attribute Remote LSAP !

! !

! 0 ! 0, 2 ! 0, 2 ! ! 0, 2 ! 0, 2 ! 0, 2 !

! to ! to ! to ! ! to ! to ! to !

! 62, ! 62, ! 62, ! 63 ! 62, ! 62, ! 62, !

! NIL ! NIL, ! NIL, ! ! NIL, ! NIL ! NIL, !

! ! All ! All ! ! All ! ! All !

+-------+-------+-------+-------+-------+-------+----------+

! Explanations: !

! 1): requester on all connections !

! 2): requester/responder on one Master-Master connection !

! for acyclic data transfer !

! 3): responder on all connection types !

! 4): requester on one Broadcast Communication Relationship!

! 5): receiver on one Broadcast Communication Relationship !

! 6): requester on one Multicast Communication Relationship!

! 7): receiver on one Multicast Communication Relationship !

+----------------------------------------------------------+

For connection-oriented communication relationships (see table above columns 1,

2 and 3) the specification of "requester" or "responder" relates only to the

connection establishment.

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