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SEMI E54.##-0705 © SEMI 2005 9 7.6.2.1. 2 Set_Attribute Prot ocol 7.6.2.1. 2.1 Th e Service Request message for the Set-Attribute is sent to a device using writing capability for following service functions of A-LINK: Un…

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Table 8 A Class Attribute Identifiers for A-LINK
Attribute ID
CDM A-LINK
Attribute Name Alternative Access
nA16 16 Setting Data Exchange
nA17 17 SafeState Data Exchange
nA18 18 WatchRate Data Exchange
nA19 19 WatchDog Data Exchange
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Prefix n in CDM attribute ID represents one of Aao, Aeo or Abo.
7.5.4.9 Controller (C) Object –– The C object contains structure and behavior common to all controller element
instances on device component as defined in the CDM standard. Attribute values are also as same as defined in the
CDM standard. The presentation of object instance attributes to the A-LINK network shall be as indicated in
Table 9. It inherits AE class attributes.
Table 9 C Class Attribute Identifiers for A-LINK
Attribute ID
CDM A-LINK
Attribute Name Alternative Access
CA16 16 Setpoint Data Exchange
CA17 17 ProcessVariable Data Exchange
CA18 18 ControlVariable Data Exchange
CA19 19 DataType Data Exchange
CA20 20 DataUnits Data Exchange
CA21 21 AlarmSettleTime Data Exchange
CA22 22 AlarmErrorBand Data Exchange
CA24 24 WarningSettleTime Data Exchange
CA25 25 WarningErrorBand Data Exchange
7.6 Services
7.6.1 A-LINK specifies standard mechanisms for the communication of data over the network. These mechanisms
are used to communicate attributes specified in the device on the A-LINK. Also they are used to request instructions
specific for component in the device on the A-LINK.
7.6.2 Service Requests and Response
7.6.2.1 The A-LINK attribute communications and instructions require specific definitions. They are described in
the following sections.
7.6.2.1.1 Service Request and Response Protocol
7.6.2.1.1.1 All service request messages, except Get_Attribute and Set_Attribute, are sent to a device using
Directive service functions of A-LINK. The responses to these message requests are specified by A-LINK.
7.6.2.1.1.2 The Service Request message is formatted, as defined by A-LINK, with the following information:
Location := Object ID
7.6.2.1.1.3 This service request message has no other information requested with the message. Response of the
request has following information:
Location := Object ID
Status := Response Information
NOTE 2: The Location information for the response message is optional (conditional) information. Representation of the Status
information is implementation specific. The Response Information is dependent on class and/or device. However if the first item
of the response information, i.e. Response Code, is zero, it always means successful. Additional data may follow.
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7.6.2.1.2 Set_Attribute Protocol
7.6.2.1.2.1 The Service Request message for the Set-Attribute is sent to a device using writing capability for
following service functions of A-LINK: Unite Inventory service, Data Exchange service or DP Facility service.
Using service function is dependent on attribute and object class as well. The dependency is given by Object Service
Identifier tables in following subsections of ¶7.6.
7.6.2.1.2.2 The service request message with Unite Inventory service function of A-LINK has a couple of
information items. Information items for the request and its response are given below respectively:
(Request)
Location := Object ID :optional
Data Name ID := Attribute ID
Data Value := Attribute Value
(Response)
Location := Object ID ;optional
Data Name ID := Attribute ID
Data Value := Attribute Value
Status := Response Information
NOTE 3: The items of Data Name ID and Data Value for the response message are optional (conditional) information.
Representation of the Status information is implementation specific. The Response Information is dependent on attribute and/or
device. However if the first item of the response information, i.e. Response Code, is zero, it always means successful. Additional
data may follow.
7.6.2.1.2.3 The service request message with Data Exchange service function of A-LINK has three information
items. Information items for the request and its response are given below respectively:
(Request)
Location := Object ID
Data Name ID := Attribute ID
Data Value := Attribute Value
(Response)
Location := Object ID
Data Name ID := Attribute ID
Data Value := Attribute Value
Status := Response Information
NOTE 4: The items of Location, Data Name ID and Data Value for the response message are optional (conditional) information.
Representation of the Status information is implementation specific. The Response Iinformation is dependent on attribute and/or
class.
7.6.2.1.2.4 The service request message with DP Facility service function of A-LINK has a couple of information
items. Information items for the request and its response are given below respectively:
(Request)
Information Name ID := Attribute ID
Information Value := Attribute Value
(Response)
Information Name ID := Attribute ID
Information Value := Attribute Value
Status := Response Information
NOTE 5: The items of Information Name ID and Information Value for the response message are optional (conditional)
information. Representation of the Status information is implementation specific. The Response Information is dependent on
attribute and/or device. However if the first item of the response information, i.e. Response Code, is zero, it always means
successful. Additional data may follow.
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7.6.2.1.3 Get_Attribute Protocol
7.6.2.1.3.1 The Service Request message for the Get-Attribute is sent to a device using reading capability for
following service functions of A-LINK: Unite Inventory service, Unite State service, Data Exchange service or DP
Facility service. Using service function is dependent on attribute and object class as well. The dependency is given
by Object Service Identifier tables in following subsections of ¶7.6.
7.6.2.1.3.2 The service request message with Unite Inventory service function of A-LINK has an information item.
Information items for the request and its response are given below respectively:
(Request)
Location := Object ID :optional
Data Name ID := Attribute ID
(Response)
Location := Object ID :optional
Data Name ID := Attribute ID
Data Value := Attribute Value
Status := Response Information
NOTE 6: The item of Data Name ID for the response message is optional (conditional) information. Representation of the Status
information is implementation specific. The Response Information is dependent on attribute and/or device. However if the first
item of the response information, i.e. Response Code, is zero, it always means successful. Additional data may follow.
7.6.2.1.3.3 The service request message with Unite State service function of A-LINK has an information item.
Information items for the request and its response are given below respectively:
(Request)
Top State Name ID := Object ID
(Response)
Top State Name ID := Object ID
Data Value := Attribute Value
Status := Response Information
NOTE 7: The item of Top State Name ID for the response message is optional (conditional) information. Representation of the
Status information is implementation specific. The Response Information is dependent on attribute and/or device. However if the
first item of the response information, i.e. Response Code, is zero, it always means successful. Additional data may follow.
7.6.2.1.3.4 The service request message with Data Exchange service function of A-LINK has a couple of
information items. Information items for the request and its response are given below respectively:
(Request)
Location := Object ID
Data Name ID := Attribute ID
(Response)
Location := Object ID
Data Name ID := Attribute ID
Data Value := Attribute Value
Status := Response Information
NOTE 8: The items of Location and Data Name ID for the response message are optional (conditional) information.
Representation of the Status information is implementation specific. The Response Information is dependent on attribute and/or
class. However if the first item of the response information, i.e. Response Code, is zero, it always means successful. Additional
data may follow.
7.6.2.1.3.5 The service request message with DP Facility service function of A-LINK has an information item.
Information items for the request and its response are given below respectively:
(Request)
Information Name ID := Attribute ID
(Response)
Information Name ID := Attribute ID