Спецификация протокола Profibus

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PROFIBUS-Specification-Normative-Parts-6:1997

Start

Current State Transition Next State

Event

\Exit Condition

=> Action Taken

SAP-ACTIVATE 56 ERROR

unallowed FMA1/2 primitive

\CRL load flag = true

=> LLI-Fault.ind<RC = LLI_FMA7_RC22, AD = code of the primitive>

LLI Enable.con(IV)

SAP-DEACTIVATE 49 LLI-DISABLE

unallowed FMA1/2 primitive

\SAP_DEACT.req called for all SAPs

in {0, 2 to 63, NIL}

=> LLI-Fault.ind<RC = LLI_FMA7_RC22, AD = code of the primitive>

LLI Disable.con

SAP-DEACTIVATE 50 SAP-DEACTIVATE

unallowed FMA1/2 primitive

\SAP_DEACT.req not yet called for all SAPs

in {0, 2 to 63, NIL}

=> LLI-Fault.ind<RC = LLI_FMA7_RC22, AD = code of the primitive>

SAP_DEACT.req

SAP-DEACTIVATE 51 LLI-DISABLE

SAP_DEACT.con(NO/IV)

\SAP_DEACT.req called for all SAPs

in {0, 2 to 63, NIL}

=> LLI-Fault.ind<RC = LLI_FMA7_RC2, AD = M_status> LLI Disable.con

LOAD-POLL-LIST 52 ERROR

unallowed FDL primitive received

\CRL load flag = false

=> LLI-Fault.ind<RC = LLI_FMA7_RC23, AD = code of the primitive>

LOAD-POLL-LIST 58 ERROR

unallowed FDL primitive received

\CRL load flag = true

=> LLI-Fault.ind<RC = LLI_FMA7_RC23, AD = code of the primitive>

LLI Enable.con(IV)

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6.7.2 Connection Establishment and Release

If a CREF is reset, the following actions shall be performed:

- Reset STimer, RTimer, T1, T2, T3

- Clear memory

- DTA-Run and T2-Already-Expired shall be set to FALSE

- Reset DTU, DTA, DTC, DTCC and IDLE state machines

- Mark the connection in the CRL as released (STATUS := "CLOSED").

- Predefine the dynamic part of the CRL with the values as defined in section

start of LLI.

Upon entry into the state machine for the connection release, the DTU, DTA, DTC

acyclic and DTC cyclic state machines shall be stopped. This action is desig-

nated in the following formal description as "Stop Machines".

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6.7.2.1 State Diagram for Connection Establishment at the Requester

ASS-

SEND-UPDATE

ASS-

REQ-WAIT-FOR-CON

deactivate poll list

entry (ENTRY.req)

ASS-

POLL-LIST-

OFF

ASS-

POLL-LIST-ON

D

ENTRY.con (OK)

All Transitions are only valid for the Master of the respective Connection Type. The Transitions

LLI Fault.ind

1,2: ABT.ind to LLI user

reset CREF

FDL primitive

LLI Fault.ind

1: S_UPDATE.con(LS/LR/IV)

2: T1 expired

1: ENTRY.con(LS/IV/NO)

2: T1 expired

poll entry enabled

:= true

ASS-

WAIT-FOR-LLI-

RES

OPEN

poll list entry deactiviated

ENTRY.con(OK)

1: ACI = 0

2: ACI > 0

1,2:ASS.con(+) to LLI user

1,2:stop T1

1,2:poll entry enabled := false

2: start S/ETimer

1...5: ASS.con(+) to LLI user, stop T1

2,4: start S/ETimer

ASS_RES_PDU received

(CSRD.con(DL))

M-S acyclic with no

Slave initiative

ASS_REQ_PDU sent

(SDA.con(OK) or

CSRD.con (DL/DH/NR,

update_status=LO))

1: ASS_REQ_PDU received

1,3,4: ignore

(SDA.ind(Low)), Loc_ <Rem_add

3

5: T1 expired

3: SDA.con(UE/RS/DS)/CSRD.con (UE/RS/DS)

4: SDA.con(LS/IV)/CSRD.con (LS/IV/OK/NO)/

unallowed FDL primitive/

CSRD.con (NR, update_status = NO)

3

T1 expired/

SAP_ACT.con(NO/IV)/

unallowed FMA1/2 primitive

ABT.ind to LLI user/

LLI Fault.ind

reset CREF

ASS-

REQ-SAP-ACTIVATE

I

ASS.req from LLI user

SAP_ACT.req

CRL entry OK all related

start T1

send ASS_REQ_PDU

SAP_ACT.con(OK)

1: SDA.con(RR/NA)/CSRD.con(RR/NA/RDL/RDH)

2: SDA.con(LR)/CSRD.con(LR)

2

2: LLI Fault.ind

1...4: ABT.ind to LLI user/

send ABT_REQ_PDU

4: CSRD.con(LS/IV/OK/NO)/

SDA.ind(Low/High) or CSRD.con(DL/DH)

3: CSRD.con(UE/RS/DS)

2: ABT_REQ_PDU received

1: ASS_NRS_PDU received

unallowed FDL primitive/

CSRD.con(NR, Upd_st=NO)

1: ASS.con(-)

2,3,4: ABT.ind to LLI user

4:LLI Fault.ind

2: ABT_REQ_PDU received, CSRD.con(DL/DH)

1: ASS_NRS_PDU received, CSRD.con(DL)

2...5:ABT.ind to LLI user

1: ASS.con(-) 4,5: LLI Fault.ind

3

1: ENTRY.con

2: T1 expired

(LS/IV/NO)

deactivate poll list entry

(ENTRY.req)

1,2: ABT.ind to LLI user

1,2: LLI Fault.ind

ASS_REQ_PDU sent and

ASS_RES_PDU received

CSRD.con(DL, update_status = LO)

1: M-S cyclic

ASS_RES_PDU received

(CSRD.con(DL) or SDA.ind(Low))

2: M-S acyclic with Slave initiative ACI > 0

3: M-S acyclic with Slave initiative ACI = 0

4: M-M and ACI>0

5: M-M and ACI=0

ASS_REQ_PDU sent and ASS_RES_PDU

received, CSRD.con (DL, update_status = LO)

1: M-S cyclic

2: M-S acyclic with Slave initiative ACI > 0

3: M-S acyclic with Slave initiative ACI = 0

1,2,3: ASS.con(+) to LLI user, stop T1

2: start S/ETimer

CLOSED

LLI start routine

ignore data

1: any unallowed LLI user.req

2: ASS.req from LLI user, CRL entry not OK

1,2,4: ABT.ind to LLI user, reset CREF

3: ABT.req from LLI user

3: ignore

send ASS_REQ_PDU

(S_UPDATE.req)

start T1

ASS.req from LLI user

CRL entry OK

ABT.ind to LLI user

1

Loc_add > Rem_add

ASS_REQ_PDU received(SDA.ind(Low))

2

1: CSRD.con(RR/NA/RDL/RDH/DH)

2: CSRD.con(LR); 3: T1 expired

2: LLI-Fault.ind

send ABT_REQ_PDU

1...6:ABT.ind to LLI user

1: ASS_REQ_PDU received

(SDA.ind(Low) ) Loc_add < Rem_add

2: not allowed LLI-PDU (SDA.ind /

CSRD.con (DL/DH, update_status = NO)

1,2: ignore

with the numbers 2 and 3 are continued in the Figure "Connection Release". The Transition

with the number 1 is continued in the Figure "Connection Establishment at the responder".

ASS.req from LLI user

CRL entry OK

send ASS_REQ_PDU

(SDA.req)

start T1

unallowed

activate poll list

(ENTRY.req)

S_UPDATE.con

(OK)

entry

unallowed FDL primitive

LLI-Fault.ind

unallowed FDL primitive

LLI-Fault.ind

connections closed

3: ASS_REQ_PDU received, SDA.ind(High)

4: ASS_RES_PDU or ASS_NRS_PDU rec., CSRD.con(DH)

SDA.ind(Low/High)

4: DTA_REQ_PDU rec., SDA.ind, CSRD.con

RAC >=maxRAC

5: ASS_REQ_ or ASS_RES_PDU, SDA.ind(High)

6: ASS_RES_ or ASS_NRS_PDU, CSRD.con(DH)

4: I, one related connection open

3: DTA_REQ_PDU received

2: DTA_REQ_PDU received

(CSRD.con(DH)/SDA.ind(High))

M-M or M-S with SI and RAC < maxRAC

2: start DTA Ack

RAC:_RAC+1

DTA Run:=True

(CSRD.con(DL)/SDA.ind(Low))

4: unknown, faulty or unallowd PDU rec.

continue DTA Ack, if DTA Run=True

Figure 109. State Diagram for Connection Establishment at the Requester

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PROFIBUS-Specification-Normative-Parts-6:1997

Description of State Transitions for Connection Establishment at the Requester

All state transitions are valid only for the master of the respective connection

type.

Connection Establishment at the Requester

Current State Transition Next State

Event

\Exit Condition

=> Action Taken

CLOSED ASSREQ 1 ASS-REQ-WAIT-FOR-CON

ASS.req from LLI user

\(CRL entry OK) AND M-M AND D

=> send ASS_REQ_PDU (SDA.req(low)), start T1

CLOSED ASSREQ 2 ASS-REQ-SAP-ACTIVATE

ASS.req from LLI user

\(CRL entry OK) AND ( M-M AND I ) AND all other CREF

related machines with identical LSAP in state closed

=> SAP_ACT.req, start T1

reset CREF

CLOSED AB 52 CLOSED

ASS.req from LLI user

\(CRL entry OK) AND ( M-M AND I ) AND at least one CREF

related machine with identical LSAP not in state closed

=> ABT.ind to LLI user

CLOSED AB 1 CLOSED

any unallowed primitive from LLI user

\M-M OR M-S

=> ABT.ind to LLI user <RC = ABT_RC18, AD = code of the primitive>

reset CREF

CLOSED AB 2 CLOSED

ASS.req from LLI user

\(CRL entry NOT OK) AND (M-M OR M-S)

=> ABT.ind to LLI user <RC = ABT_RC20>

reset CREF

CLOSED AB 48 CLOSED

ABT.req from LLI user

=> ignore

CLOSED ASSREQ 3 ASS-SEND-UPDATE

ASS.req from LLI user

\(CRL entry OK) AND M-S

=> send ASS_REQ_PDU (S_UPDATE.req), start T1

ASS-REQ-SAP-ACTIVATE AB 3 CLOSED

SAP_ACT.con(NO/IV)

\M-M

=> ABT.ind to LLI user <RC = ABT_RC13, AD = error state>

LLI-Fault.ind <RC = LLI_FMA7_RC1, AD = error state>

reset CREF

ASS-REQ-SAP-ACTIVATE ASSREQ 5 ASS-REQ-WAIT-FOR-CON

SAP_ACT.con(OK)

\M-M

=> send ASS_REQ_PDU (SDA.req(low))

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Connection Establishment at the Requester

Current State Transition Next State

Event

\Exit Condition

=> Action Taken

ASS-SEND-UPDATE AB 4 CLOSED

error in loading the update buffer

(S_UPDATE.con(LS/LR/IV))

\M-S

=> ABT.ind to LLI user <RC = LS/LR/IV, AD = ABT_AD1>

LLI-Fault.ind <RC = LLI_FMA7_RC3, AD = LS/LR/IV>

reset CREF

ASS-SEND-UPDATE AB 5 CLOSED

T1 expired

\M-S

=> ABT.ind to LLI user <RC = ABT_RC10>

LLI-Fault.ind <RC = LLI_FMA7_RC18>

reset CREF

ASS-SEND-UPDATE ASSREQ 6 ASS-SEND-UPDATE

unallowed FDL primitive

\M-S

=> LLI-Fault.ind <RC = LLI_FMA7_RC6, AD = code of prim.>

ASS-SEND-UPDATE ASSREQ 7 ASS-POLL-LIST-ON

update buffer loaded (S_UPDATE.con(OK))

\M-S

=> activate Poll List entry

(ENTRY.req(remote address/remote LSAP/unlock))

ASS-POLL-LIST-ON AB 6 CLOSED

error in the activation of the Poll List entry

(ENTRY.con(LS/IV/NO))

\M-S

=> ABT.ind to LLI user <RC = LS/IV/NO, AD = ABT_AD2>

LLI-Fault.ind <RC = LLI_FMA7_RC4, AD = LS/IV/NO>

reset CREF

ASS-POLL-LIST-ON AB 7 CLOSED

T1 expired

\M-S

=> ABT.ind to LLI user <RC = ABT_RC10>

LLI-Fault.ind <RC = LLI_FMA7_RC18>

reset CREF

ASS-POLL-LIST-ON ASSREQ 8 ASS-POLL-LIST-ON

unallowed FDL primitive

\M-S

=> LLI-Fault.ind <RC = LLI_FMA7_RC6,

AD = Code of primitive>

ASS-POLL-LIST-ON ASSREQ 9 ASS-REQ-WAIT-FOR-CON

Poll List entry activated (ENTRY.con(OK))

\M-S

=> poll entry enabled := true

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Connection Establishment at the Requester

Current State Transition Next State

Event

\Exit Condition

=> Action Taken

ASS-REQ-WAIT-FOR-CON ASSREQ 10 ASS-REQ-WAIT-FOR-CON

unallowed, unknown or faulty LLI PDU received

(SDA.ind(serv_class = low/high))

\M-M

=> ignore

ASS-REQ-WAIT-FOR-CON ASSREQ 11 ASS-WAIT-FOR-LLI-RES

ASS_REQ_PDU sent (SDA.con(OK))

\M-M

ASS-REQ-WAIT-FOR-CON ASSREQ 29 ASS-WAIT-FOR-LLI-RES

ASS_REQ_PDU sent (CSRD.con(L_status = DL/DH/NR, update_status = LO))

AND NOT (ASS_RES_PDU OR ASS_NRS_PDU OR ABT_REQ_PDU)received

(CSRD.con(L_status = DL, update_status = LO))

\M-S

=> ignore data if present

ASS-REQ-WAIT-FOR-CON ASSREQ 25 OPEN

ASS_REQ_PDU sent AND ASS_RES_PDU received

(CSRD.con(L_status = DL, update_status = LO))

\cyc. M-S

=> ASS.con(R+) to FMS

stop T1

ASS-REQ-WAIT-FOR-CON ASSREQ 26 OPEN

ASS_REQ_PDU sent AND ASS_RES_PDU received

(CSRD.con(L_status = DL, update_status = LO))

\acyc. M-S with SI AND (ACI > 0)

=> ASS.con(R+) to FMS

stop T1

start S/E Timer

ASS-REQ-WAIT-FOR-CON ASSREQ 27 OPEN

ASS_REQ_PDU sent AND ASS_RES_PDU received

(CSRD.con(L_status = DL, update_status = LO))

\acyc. M-S with SI AND (ACI = 0)

=> ASS.con(R+) to FMS

stop T1

ASS-REQ-WAIT-FOR-CON ASSREQ 28 ASS-POLL-LIST-OFF

ASS_REQ_PDU sent AND ASS_RES_PDU received

(CSRD.con(L_status = DL, update_status = LO))

\acyc. M-S without SI

=> deactivate Poll List entry

(ENTRY.req(remote address/remote LSAP/lock))

ASS-REQ-WAIT-FOR-CON AB 8 ABT-SEND-PDU

1)

error on sending the ASS_REQ_PDU (SDA.con(RR/NA))

\M-M

=> ABT.ind to LLI user <RC = RR/NA, AD = ABT_AD2>

send ABT_REQ_PDU <RC = RR/NA> (SDA.req(low))

stop all timers, start T2

1) see state diagram for connection release

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Connection Establishment at the Requester

Current State Transition Next State

Event

\Exit Condition

=> Action Taken

ASS-REQ-WAIT-FOR-CON AB 9 ABT-SEND-PDU

1)

error on sending the ASS_REQ_PDU (SDA.con(LR))

\M-M

=> ABT.ind to LLI user <RC = LR, AD = ABT_AD4>

send ABT_REQ_PDU <RC = LR>

(SDA.req(low))

LLI-Fault.ind <RC = LLI_FMA7_RC12, AD = LR>

stop all timers, start T2

ASS-REQ-WAIT-FOR-CON AB 10 ABT-UPDATE

1)

error on sending the ASS_REQ_PDU

(CSRD.con(L_status = RR/NA/RDL/RDH))

\M-S

=> ABT.ind to LLI user <RC = RR/NA/RDL/RDH, AD = ABT_AD5>

send ABT_REQ_PDU <RC = RR/NA/RDL/RDH>(S_UPDATE.req)

stop all timers, start T2

ignore data if present

ASS-REQ-WAIT-FOR-CON AB 11 ABT-UPDATE

1)

error on sending the ASS_REQ_PDU

(CSRD.con(L_status = LR))

\M-S

=> ABT.ind to LLI user <RC = LR, AD = ABT_AD5>

send ABT_REQ_PDU <RC = LR>

(S_UPDATE.req)

LLI-Fault.ind <RC = LLI_FMA7_RC13, AD = LR>

stop all timers, start T2

ASS-REQ-WAIT-FOR-CON AB 12 CLOSED

error on sending the ASS_REQ_PDU (SDA.con(UE/RS/DS))

\M-M AND D

=> ABT.ind to LLI user <RC = UE/RS/DS, AD = ABT_AD4>

reset CREF

ASS-REQ-WAIT-FOR-CON AB 13 CLOSED

T1 expired

\M-M AND D

=> ABT.ind to LLI user <RC = ABT_RC10>

reset CREF

ASS-REQ-WAIT-FOR-CON AB 14 ABT-SAP-DEACTIVATE

1)

error on sending the ASS_REQ_PDU (SDA.con(UE/RS/DS))

\M-M AND I

=> ABT.ind to LLI user <RC = UE/RS/DS, AD = ABT_AD4>

stop all timers, start T2, SAP_DEACT.req

ASS-REQ-WAIT-FOR-CON AB 15 ABT-SAP-DEACTIVATE

1)

T1 expired

\M-M AND I

=> ABT.ind to LLI user <RC = ABT_RC10>

LLI-Fault.ind <RC = LLI_FMA7_RC18>

stop all timers, start T2, SAP_DEACT.req

1) see state diagram for connection release

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Connection Establishment at the Requester

Current State Transition Next State

Event

\Exit Condition

=> Action Taken

ASS-REQ-WAIT-FOR-CON AB 16 CLOSED

error on sending the ASS_REQ_PDU (SDA.con(LS/IV))

\M-M AND D

=> ABT.ind to LLI user <RC = LS/IV, AD = ABT_AD4>

LLI-Fault.ind <RC = LLI_FMA7_RC12, AD = LS/IV>

reset CREF

ASS-REQ-WAIT-FOR-CON AB 17 CLOSED

unallowed FDL primitive

\M-M AND D

=> ABT.ind to LLI user <RC = ABT_RC14, AD = code of the primitive>

LLI-Fault.ind <RC = LLI_FMA7_RC6, AD = code of the primitive>

reset CREF

ASS-REQ-WAIT-FOR-CON AB 18 ABT-SAP-DEACTIVATE

1)

error on sending the ASS_REQ_PDU (SDA.con(LS/IV))

\M-M AND I

=> ABT.ind to LLI user <RC = LS/IV, AD = ABT_AD4>

LLI-Fault.ind <RC = LLI_FMA7_RC12, AD = LS/IV>

stop all timers, start T2

SAP_DEACT.req

ASS-REQ-WAIT-FOR-CON AB 19 ABT-SAP-DEACTIVATE

1)

unallowed FDL primitive

\M-M AND I

=> ABT.ind to LLI user <RC = ABT_RC14,

AD = code of the primitive>

LLI-Fault.ind <RC = LLI_FMA7_RC6,

AD = code of the primitive>

stop all timers, start T2

SAP_DEACT.req

ASS-REQ-WAIT-FOR-CON AB 20 ABT-POLL-LIST-OFF

1)

error on sending the ASS_REQ_PDU

(CSRD.con(L_status = UE/RS/DS))

\M-S

=> ABT.ind to LLI user <RC = UE/RS/DS, AD = ABT_AD5>

deactivate Poll List entry

(ENTRY.req(remote address/remote LSAP/lock))

stop all timers, start T2

ASS-REQ-WAIT-FOR-CON AB 21 ABT-POLL-LIST-OFF

1)

T1 expired

\M-S

=> ABT.ind to LLI user <RC = ABT_RC10>

LLI-Fault.ind <RC = LLI_FMA7_RC18>

deactivate Poll List entry

(ENTRY.req(remote address/remote LSAP/lock))

stop all timers, start T2

1) see state diagram for connection release

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PROFIBUS-Specification-Normative-Parts-6:1997

Connection Establishment at the Requester

Current State Transition Next State

Event

\Exit Condition

=> Action Taken

ASS-REQ-WAIT-FOR-CON AB 22 ABT-POLL-LIST-OFF

1)

error on sending the ASS_REQ_PDU

(CSRD.con(L_status = LS/IV/OK/NO))

\M-S

=> ABT.ind to LLI user <RC = LS/IV/OK/NO, AD = ABT_AD5>

LLI-Fault.ind <RC = LLI_FMA7_RC13, AD = LS/IV/OK/NO>

deactivate Poll List entry

(ENTRY.req(remote address/remote LSAP/lock))

stop all timers, start T2

ASS-REQ-WAIT-FOR-CON AB 23 ABT-POLL-LIST-OFF

1)

unallowed FDL primitive

\M-S

=> ABT.ind to LLI user <RC=ABT_RC14, AD=code of prim.>

LLI-Fault.ind <RC = LLI_FMA7_RC6, AD = code of the primitive>

deactivate Poll List entry

(ENTRY.req(remote address/remote LSAP/lock))

stop all timers, start T2

ASS-REQ-WAIT-FOR-CON AB 46 ABT-POLL-LIST-OFF

1)

ASS_REQ_PDU sent AND ASS_NRS_PDU received

(CSRD.con(L_status = DL, update_status = LO))

\M-S

=> ASS.con(R-) to LLI user

stop all timers

start T2

deactivate Poll List entry

(ENTRY.req(remote address/remote LSAP/lock))

ASS-REQ-WAIT-FOR-CON AB 47 ABT-POLL-LIST-OFF

1)

ASS_REQ_PDU sent AND ABT_REQ_PDU received

(CSRD.con(L_status = DL/DH, update_status = LO))

\M-S

=> ABT.ind to LLI user <RC = RC in ABT_REQ_PDU>

stop all timers, start T2

deactivate Poll List entry

(ENTRY.req(remote address/remote LSAP/lock))

ASS-REQ-WAIT-FOR-CON ASSREQ 30 ASS-REQ-WAIT-FOR-CON

ASS_REQ_PDU received (SDA.ind(serv_class = low))

\M-M AND (local address < remote address)

=> ignore

ASS-REQ-WAIT-FOR-CON ASSREQ 31 ASS-WAIT-LOC-RES

2)

ASS_REQ_PDU received (SDA.ind(serv_class = low))

\M-M AND (local address > remote address)

AND (LLI-LLI context test OK)

=> ABT.ind to LLI user <RC = ABT_RC21>

ASS.ind to LLI user

start T1

1) see state diagram for connection release

2) see connection establishment at the responder

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PROFIBUS-Specification-Normative-Parts-6:1997

Connection Establishment at the Requester

Current State Transition Next State

Event

\Exit Condition

=> Action Taken

ASS-REQ-WAIT-FOR-CON AB 49 ABT-SEND-PDU

1)

ASS_REQ_PDU received (SDA.ind(serv_class = low))

\M-M AND (local address > remote address)

AND (LLI-LLI context test negative)

=> ABT.ind to LLI user <RC = ABT_RC21>

send ABT_REQ_PDU

<RC = ABT_RC1, AD = local LLI context> (SDA.req(low))

stop all timers, start T2

ASS-REQ-WAIT-FOR-CON AB 50 ABT-SEND-PDU

1)

ASS_REQ_PDU OR ASS_RES_PDU OR ASS_NRS_PDU received

(SDA.ind(serv_class = high))

\M-M

=> ABT.ind to LLI user <RC = ABT_RC8>

send ABT_REQ_PDU

<RC = ABT_RC8> (SDA.req(low))

stop all timers, start T2

ASS-REQ-WAIT-FOR-CON AB 51 ABT-UPDATE

1)

ASS_REQ_PDU sent AND (ASS_RES_PDU OR ASS_NRS_PDU received)

(CSRA.con(L_status = DH, update_status = LO))

\M-S

=> ABT.ind to LLI user <RC = ABT_RC8>

send ABT_REQ_PDU <RC = ABT_RC8>

stop all timers, start T2

ASS-REQ-WAIT-FOR-CON AB 54 CLOSED

ABT_REQ_PDU received (SDA.ind(serv_class = low/high))

\M-M AND D

=> ABT.ind to LLI user <RC = RC in ABT_REQ_PDU>

reset CREF

ASS-REQ-WAIT-FOR-CON AB 53 ABT-SAP-DEACTIVATE

ABT_REQ_PDU received (SDA.ind(serv_class = low/high))

\M-M AND I

=> ABT.ind to LLI user <RC = RC in ABT_REQ_PDU>

stop all timers, start T2

SAP_DEACT.req

ASS-WAIT-FOR-LLI-RES ASSREQ 12 OPEN

ASS_RES_PDU received (SDA.ind(serv_class = low))

\M-M AND (ACI > 0) AND (DTA-Run = FALSE)

=> ASS.con(R+) to LLI user

stop T1, start S/E Timer

ASS-WAIT-FOR-LLI-RES ASSREQ 32 OPEN

ASS_RES_PDU received (SDA.ind(serv_class = low))

\M-M AND (ACI > 0) AND (DTA-Run = TRUE)

=> ASS.con(R+) to LLI user

stop T1, start S/E Timer

continue DTA-Ack.(all started DTA-Ack.)

1) see state diagram for connection release

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