Спецификация протокола Profibus
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4.3.2.3 CHOICE
A CHOICE represents a selection from a set of predefined possibilities.
The components of a CHOICE construct shall have different tags to allow proper
identification.
Instead of the CHOICE construct the actually selected component is encoded.
EXAMPLE:
Data ::= CHOICE {
[0] Employeedata,
[1] Clientdata,
[2] Supplierdata
}
5 Syntax Description
5.1 The FMS PDU
5.1.1 Description of the fixed PDU Part
The FMS PDU consists of a fixed part of 3 octets and a part of variable length.
Not all PDUs need a part with variable length.
The fixed part consists of a first ID Info, which states the service class (e.g.
Confirmed Request, Confirmed Response), an Invoke ID (1 octet, Data Type Inte-
ger8) and a second ID Info which identifies the PDU more precisely.
+------------------------+----------------+-----------------+
! First ID Info: ! Invoke ID ! Second ID Info: !
! 1. Confirmed Request ! ! e.g. Read, !
! 2. Confirmed Response ! ( Integer8) ! Write, etc. !
! 3. Confirmed Error ! ! !
! 4. Unconfirmed PDU ! ! !
! 5. Reject PDU ! ! !
! 6. Initiate PDU ! ! !
+------------------------+----------------+-----------------+
Figure 15. Field with Fixed Format
The syntax of the PDU is described in the formal description language ASN.1. The
syntax of the fixed field is described in ASN.1 too. The special length saving
FER (Fieldbus Encoding Rules) are used. The FER allow data fields inside the
PDU, which have no explicit Identification Information (for the Invoke ID).
The fixed format for the first three octets requires an InvokeID even for PDUs
that need no InvokeID (such as Unconfirmed-PDU, Reject-PDU, Initiate-PDU). Only
the range from 0 to 6 may be used for the tag of the first ID Info. Otherwise an
extension would be necessary, which would require one additional octet and would
then be incompatible with a fixed format (fixed position of the InvokeID).
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The fixed part of the PDU is defined in the following.
FMS PDU:
FMSpdu ::= CHOICE {
confirmed-RequestPDU [1] IMPLICIT Confirmed-RequestPDU,
confirmed-ResponsePDU [2] IMPLICIT Confirmed-ResponsePDU,
confirmed-ErrorPDU [3] IMPLICIT Confirmed-ErrorPDU,
unconfirmed-PDU [4] IMPLICIT Unconfirmed-PDU,
reject-PDU [5] IMPLICIT Reject-PDU,
initiate-PDU [6] IMPLICIT Initiate-PDU
}
Confirmed-RequestPDU ::= SEQUENCE {
invokeID InvokeID,
confirmedServiceRequest ConfirmedServiceRequest
}
Confirmed-ResponsePDU ::= SEQUENCE {
invokeID InvokeID,
confirmedServiceResponse ConfirmedServiceResponse
}
Confirmed-ErrorPDU ::= SEQUENCE {
invokeID InvokeID,
serviceError ServiceError
}
Unconfirmed-PDU ::= SEQUENCE {
invokeID InvokeID, -- Dummy
unconfirmed UnconfirmedService
}
Reject-PDU ::= SEQUENCE {
invokeID InvokeID, -- Dummy
reject Reject
}
Initiate-PDU ::= SEQUENCE {
invokeID InvokeID, -- Dummy
initiatepdu InitiatePDU
}
InvokeID ::= Integer8
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5.1.2 ConfirmedServiceRequest
ConfirmedServiceRequest ::= CHOICE {
status [0] IMPLICIT Status-Request,
identify [1] IMPLICIT Identify-Request,
read [2] IMPLICIT Read-Request,
write [3] IMPLICIT Write-Request,
getOD [4] IMPLICIT GetOD-Request,
readWithType [5] IMPLICIT ReadWithType-Request,
writeWithType [6] IMPLICIT WriteWithType-Request,
defineVariableList [7] IMPLICIT DefineVariableList-Request,
deleteVariableList [8] IMPLICIT DeleteVariableList-Request,
initiateDownloadSequence [9] IMPLICIT InitiateDownloadSequence-Request,
downloadSegment [10] IMPLICIT DownloadSegment-Request,
terminateDownloadSequence [11] IMPLICIT TerminateDownloadSequence-Request,
initiateuploadSequence [12] IMPLICIT InitiateUploadSequence-Request,
uploadSegment [13] IMPLICIT UploadSegment-Request,
terminateUploadSequence [14] IMPLICIT TerminateUploadSequence-Request,
requestDomainDownload [15] IMPLICIT RequestDomainDownload-Request,
requestDomainUpload [16] IMPLICIT RequestDomainUpload-Request,
createProgramInvocation [17] IMPLICIT CreateProgramInvocation-Request,
deleteProgramInvocation [18] IMPLICIT DeleteProgramInvocation-Request,
start [19] IMPLICIT Start-Request,
stop [20] IMPLICIT Stop-Request,
resume [21] IMPLICIT Resume-Request,
reset [22] IMPLICIT Reset-Request,
kill [23] IMPLICIT Kill-Request,
alterEventConditionMonitoring [24] IMPLICIT
AlterEventConditionMonitoring-Request,
acknowledgeEventNotification [25] IMPLICIT
AcknowledgeEventNotification-Request,
physRead [26] IMPLICIT PhysRead-Request,
physWrite [27] IMPLICIT PhysWrite-Request,
initiatePutOD [28] IMPLICIT InitiatePutOD-Request,
putOD [29] IMPLICIT PutOD-Request,
terminatePutOD [30] IMPLICIT TerminatePutOD-Request
}
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5.1.3 ConfirmedServiceResponse
ConfirmedServiceResponse ::= CHOICE {
status [0] IMPLICIT Status-Response,
identify [1] IMPLICIT Identify-Response,
read [2] IMPLICIT Read-Response,
write [3] IMPLICIT Write-Response,
getOD [4] IMPLICIT GetOD-Response,
readWithType [5] IMPLICIT ReadWithType-Response,
writeWithType [6] IMPLICIT WriteWithType-Response,
defineVariableList [7] IMPLICIT DefineVariableList-Response,
deleteVariableList [8] IMPLICIT DeleteVariableList-Response,
initiateDownloadSequence [9] IMPLICIT InitiateDownloadSequence-Response,
downloadSegment [10] IMPLICIT DownloadSegment-Response,
terminateDownloadSequence [11] IMPLICIT
TerminateDownloadSequence-Response,
initiateuploadSequence [12] IMPLICIT
InitiateUploadSequence-Response,
uploadSegment [13] IMPLICIT UploadSegment-Response,
terminateUploadSequence [14] IMPLICIT TerminateUploadSequence-Response,
requestDomainDownload [15] IMPLICIT RequestDomainDownload-Response,
requestDomainUpload [16] IMPLICIT RequestDomainUpload-Response,
createProgramInvocation [17] IMPLICIT CreateProgramInvocation-Response,
deleteProgramInvocation [18] IMPLICIT DeleteProgramInvocation-Response,
start [19] IMPLICIT Start-Response,
stop [20] IMPLICIT Stop-Response,
resume [21] IMPLICIT Resume-Response,
reset [22] IMPLICIT Reset-Response,
kill [23] IMPLICIT Kill-Response,
alterEventConditionMonitoring [24] IMPLICIT
AlterEventConditionMonitoring-Response,
acknowledgeEventNotification [25] IMPLICIT
AcknowledgeEventNotification-Response,
physRead [26] IMPLICIT PhysRead-Response,
physWrite [27] IMPLICIT PhysWrite-Response,
initiatePutOD [28] IMPLICIT InitiatePutOD-Response,
putOD [29] IMPLICIT PutOD-Response,
terminatePutOD [30] IMPLICIT TerminatePutOD-Response
}
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5.1.4 ServiceError
ServiceError ::= CHOICE {
status [0] IMPLICIT Error-Type,
identify [1] IMPLICIT Error-Type,
read [2] IMPLICIT Error-Type,
write [3] IMPLICIT Error-Type,
getOD [4] IMPLICIT Error-Type,
readWithType [5] IMPLICIT Error-Type,
writeWithType [6] IMPLICIT Error-Type,
defineVariableList [7] IMPLICIT Error-Type,
deleteVariableList [8] IMPLICIT Error-Type,
initiateDownloadSequence [9] IMPLICIT Error-Type,
downloadSegment [10] IMPLICIT Error-Type,
terminateDownloadSequence [11] IMPLICIT Error-Type,
initiateuploadSequence [12] IMPLICIT Error-Type,
uploadSegment [13] IMPLICIT Error-Type,
terminateUploadSequence [14] IMPLICIT Error-Type,
requestDomainDownload [15] IMPLICIT Error-Type,
requestDomainUpload [16] IMPLICIT Error-Type,
createProgramInvocation [17] IMPLICIT Error-Type,
deleteProgramInvocation [18] IMPLICIT Error-Type,
start [19] IMPLICIT PI-Error-Type,
stop [20] IMPLICIT PI-Error-Type,
resume [21] IMPLICIT PI-Error-Type,
reset [22] IMPLICIT PI-Error-Type,
kill [23] IMPLICIT Error-Type,
alterEventConditionMonitoring [24] IMPLICIT Error-Type,
acknowledgeEventNotification [25] IMPLICIT Error-Type,
physRead [26] IMPLICIT Error-Type,
physWrite [27] IMPLICIT Error-Type,
initiatePutOD [28] IMPLICIT Error-Type,
putOD [29] IMPLICIT Error-Type,
terminatePutOD [30] IMPLICIT OD-Error-Type
}
5.1.4.1 Error Type
Error-Type ::= SEQUENCE {
error-class [0] IMPLICIT error-class,
additional-code [1] IMPLICIT Integer16 OPTIONAL,
additional-description [2] IMPLICIT VISIBLE STRING OPTIONAL
}
5.1.4.2 PI Error Type
PI-Error-Type ::= SEQUENCE {
error-class [0] IMPLICIT Error-Class,
additional-code [1] IMPLICIT Integer16 OPTIONAL,
additional-description [2] IMPLICIT VISIBLE STRING OPTIONAL,
pi-state [3] IMPLICIT ProgramInvocationState
}
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5.1.4.3 OD Error Type
ODErrorType ::= SEQUENCE {
error-class [0] IMPLICIT Error-Class,
additional-code [1] IMPLICIT Integer16 OPTIONAL,
additional-description [2] IMPLICIT VISIBLE STRING OPTIONAL,
index [3] IMPLICIT Index
}
5.1.4.4 Error Class
error-class ::= SEQUENCE {
CHOICE {
vfd-state [1] IMPLICIT Integer8 {
other (0)
},
application-reference [2] IMPLICIT Integer8 {
other (0),
application-unreachable (1)
},
definition [3] IMPLICIT Integer8 {
other (0),
object-undefined (1),
object-attributes-inconsistent (2),
name-already-exists (3)
},
resource [4] IMPLICIT Integer8 {
other (0),
memory-unavailable (1)
},
service [5] IMPLICIT Integer8 {
other (0),
object-state-conflict (1),
pdu-size (2),
object-constraint-conflict (3),
parameter-inconsistent (4),
illegal-parameter (5)
},
access [6] IMPLICIT Integer8 {
other (0),
object-invalidated (1),
hardware-fault (2),
object-access-denied (3),
invalid-address (4),
object-attribute-inconsistent (5),
object-access-unsupported (6),
object-non-existent (7),
type-conflict (8),
named-access-unsupported (9)
},
od [7] IMPLICIT Integer8 {
other (0),
name-length-overflow (1),
od-overflow (2),
od-write-protected (3),
extension-length-overflow (4),
od-description-length-overflow (5),
operational-problem (6)
},
other [8] IMPLICIT Integer8 {
other (0)
}}}
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5.1.5 Unconfirmed PDUs
UnconfirmedService ::= CHOICE {
informationReport [0] IMPLICIT InformationReport,
unsolicitedStatus [1] IMPLICIT UnsolicitedStatus,
eventNotification [2] IMPLICIT EventNotification,
informationReportWithType [3] IMPLICIT InformationReportWithType,
eventNotificationWithType [4] IMPLICIT EventNotificationWithType
}
5.1.6 Reject
Reject ::= [0] IMPLICIT SEQUENCE {
original-invokeId [0] IMPLICIT Integer8,
reject-code [1] IMPLICIT Integer8 {
other (0),
PDU-Size (5)
}}
5.1.7 Initiate PDUs
InitiatePDU ::= CHOICE {
init-request [0] IMPLICIT Initiate-RequestPDU,
init-response [1] IMPLICIT Initiate-ResponsePDU,
init-error [2] IMPLICIT Initiate-ErrorPDU
}
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5.1.8 General Substitutions
Index ::= Unsigned16
Name ::= VISIBLE STRING
Subindex ::= Unsigned8
Local-Address ::= Unsigned32
Length ::= Unsigned8
MoreFollows ::= BOOLEAN
Data ::= PACKED
Typedescription ::= SEQUENCE OF CHOICE {
simple [1] IMPLICIT PACKED,
-- Octet1: Hibyte Data Type Index
-- Octet2: Lobyte Data Type Index
-- Octet3: Length
array [2] IMPLICIT PACKED,
-- Octet1: Hibyte Data Type Index
-- Octet2: Lobyte Data Type Index
-- Octet3: Length
-- Octet4: Number Of Elements
structure [3] IMPLICIT PACKED
-- Octet 1 : Hibyte Data Type Index (Element 1)
-- Octet 2 : Lobyte Data Type Index (Element 1)
-- Octet 3 : Length (Element 1)
-- Octet 3n-2 : Hibyte Data Type Index (Element n)
-- Octet 3n-1 : Lobyte Data Type Index (Element n)
-- Octet 3n-0 : Length (Element n)
}
Integer8 ::= INTEGER -- 8 Bit Integer
Integer16 ::= INTEGER -- 16 Bit Integer
Integer32 ::= INTEGER -- 32 Bit Integer
Unsigned8 ::= UNSIGNED -- 8 Bit Unsigned
Unsigned16 ::= UNSIGNED -- 16 Bit Unsigned
Unsigned32 ::= UNSIGNED -- 32 Bit Unsigned
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5.2 VFD Support
5.2.1 Status
Status-Request ::= NULL
Status-Response ::= SEQUENCE {
logical-status [0] IMPLICIT Unsigned8 {
state-changes-allowed (0),
limited-services-permitted (2),
od-loading-non-interacting (4),
od-loading-interacting (5)
},
physical-status [1] IMPLICIT Unsigned8 {
operational (0),
partially-operational (1),
inoperable (2),
needs-commissioning (3)
},
local-detail [2] IMPLICIT BIT STRING OPTIONAL
-- Length 24 Bit
}
5.2.2 Identify
Identify-Request ::= NULL
Identify-Response ::= SEQUENCE {
vendor-name [0] IMPLICIT VISIBLE STRING,
model-name [1] IMPLICIT VISIBLE STRING,
revision [2] IMPLICIT VISIBLE STRING
}
5.2.3 UnsolicitedStatus
UnsolicitedStatus ::= Status-Response
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5.3 OD Management
5.3.1 Object Description and OD Description
Objectdescription ::= PACKED
5.3.2 GetOD
GetOD-Request ::= SEQUENCE {
all-attributes [0] IMPLICIT BOOLEAN,
access-specification CHOICE {
index [1] IMPLICIT Index,
variable-name [2] IMPLICIT Name,
variable-list-name [3] IMPLICIT Name,
domain-name [4] IMPLICIT Name,
pi-name [5] IMPLICIT Name,
event-name [6] IMPLICIT Name,
startindex [7] IMPLICIT Index
}
}
GetOD-Response ::= SEQUENCE {
list-of-objectdescription [0] IMPLICIT SEQUENCE OF {
objectdescription [0] IMPLICIT Objectdescription
},
more-follows [1] IMPLICIT MoreFollows
}
5.3.3 InitiatePutOD
InitiatePutOD-Request ::= Consequence
Consequence ::= Integer8 {
od-loading-non-interacting (0),
od-appending-interacting (1),
od-fresh-loading-interacting (2)
}
InitiatePutOD-Response ::= NULL
5.3.4 PutOD
PutOD-Request ::= SEQUENCE OF {
objectdescription [0] IMPLICIT Objectdescription
}
PutOD-Response ::= NULL