ﬁguration is completed, communication to thethe interoperability list is de ﬁned as in iec...

The term signal engineering here means the engineering needed to establishcommunication to the IEDs using the IEC protocol. In order to create the process objectdatabase, the data types and the addresses of the data points used by each remote deviceneed to be identified. When system configuration is completed, communication to theIEDs is possible but the utilization of the functions of the IEDs is not possible until theprocess object database is created. The principal sequence for the signal engineering is:

1. Make a list of all signals that are to be transferred between the master and the slave.Create the corresponding process objects. No data poll definitions are needed sinceIEC60870-5-104 uses spontaneous data transmission.

2. Determine the need for the general interrogations and time synchronizations andmake the necessary application changes.

3. Test each signal.

The status codes for the IEC 60870-5-104 Master protocol are defined in the SYS600Status Codes manual. Some typical reasons for some of the status codes are also given.

Status codes are sent as system messages which can be received by analog input projectobjects with a unit number (UN) 0 and an object address (OA) as determined by the MIattribute of the line or station, or alternatively, they are returned as a response to a SCILcommand accessing a IEC station object.

This companion standard presents sets of parameters and alternatives from which subsetsmust be selected to implement particular telecontrol systems. Certain parameter values,such as the choice of "structured" or "unstructured" fields of the INFORMATIONOBJECT ADDRESS of ASDUs represent mutually exclusive alternatives. This meansthat only one value of the defined parameters is admitted per system. Other parameters,

such as the listed set of different process information in both command and monitordirection, allow the specification of the complete set or subsets, as appropriate for givenapplications. This clause summarizes the parameters of the previous clauses to facilitatea suitable selection for a specific application. If a system is composed of equipmentstemming from different manufacturers, it is necessary that all partners agree on theselected parameters.

The interoperability list is defined as in IEC 60870-5-101 and extended with parametersused in this standard. The text descriptions of parameters which are not applicable tothis companion standard are strike-through (corresponding check box is marked black).

In addition, the full specification of a system may require theindividual selection of certain parameters for certain parts ofthe system, such as the individual selection of scaling factorsfor individually addressable measured values.

The selected parameters should be marked in the white boxes as follows:

The possible selection (blank, X, R, or B) is specified for each specific clause orparameter.

A black check box indicates that the option cannot be selected in this companion standard.

(system-specific parameter)

(network-specific parameter)



Frame format FT 1.2, single character 1 and the fixed time out interval are usedexclusively in this companion standard.

When using an unbalanced link layer, the following ASDU types are returned in class2 messages (low priority) with the indicated causes of transmission:

Mode 1 (least significant octet first), as defined in 4.10 of IEC 60870-5-4, is usedexclusively in this companion standard.





The maximum length of APDU for both directions is 253. It is a fixed system parameter.

Process information in monitor direction

(station-specific parameter)

Although ASDUs <2>, <4>, <6>, <8>, <10>, <12>, <14> and <16> are not part of theIEC 60870-5-104 companion standard, they are also supported to provide compatibilitywith gateway devices using IEC 60870-5-101.


Either the ASDUs of the set <45> – <51> or of the set <58> – <64> are used.


(station-specific parameters)

Shaded boxes are not required.Blank = function or ASDU is not used.Mark type identification/cause of transmission combinations:"X" if used only in the standard direction"R" if used only in the reverse direction"B" if used in both directions


The following type identifications may be transmitted in succession caused by a singlestatus change of an information object. The particular information object addresses forwhich double transmission is enabled are defined in a project-specific list.

(station-specific parameter or object-specific parameter)



(station-specific parameter or object-specific parameter)

(object-specific parameter)




File transfer in monitor direction

File transfer in control direction



Maximum range for timeouts t0 to t2: 1 s to 255 s, accuracy 1 s.

Maximum range of values k: 1 to 32767 (2^15–1) APDUs, accuracy 1 APDU

Maximum range of values w: 1 to 32767 APDUs, accuracy 1 APDU (Recommendation:w should not exceed two-thirds of k).

RFC 2200 is an official Internet Standard which describes the state of standardizationof protocols used on the Internet as determined by the Internet Architecture Board (IAB).It offers a broad spectrum of actual standards used on the Internet. The suitable selectionof documents from RFC 2200 defined in this standard for given projects has to be chosenby the user of this standard.

List of valid documents from RFC 2200

1.2.3.4.5.6.7. etc.

In distribution automation systems, the SPA-bus protocol may be required to accessdevice information that is not mapped to the IEC 60870-5-101 protocol. This informationincludes several device specific parameters and recorded disturbance data. Two ASDUtypes from the private range have been selected to enable transparent transfer of theSPA-bus messages.

ASDU 133 - SPA-bus message

TYPE IDENT 133: C_SB_NA_1

ﬁguration is completed, communication to thethe interoperability list is de ﬁned as in iec...

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