VAMP 257
Feeder and motor manager
Technical description
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VM257.EN002
IEC 60870-5-103
The IEC standard 60870-5-103 “Companion standard for the
informative interface of protection equipment” provides
standardized communication interface to a primary system
(master system).
The unbalanced transmission mode of the protocol is used, and
the feeder manager functions as a secondary station (slave) in
the communication. Data is transferred to the primary system
using “data acquisition by polling”-principle. The IEC
functionality includes the following application functions:
•
station initialization
•
general interrogation
•
clock synchronization and
•
command transmission.
It is not possible to transfer parameter data or disturbance
recordings via the IEC 103 protocol interface.
The following ASDU (Application Service Data Unit) types will
be used in communication from the feeder manager:
•
ASDU 1: time tagged message
•
ASDU 3: Measurands I
•
ASDU 5: Identification message
•
ASDU 6: Time synchronization and
•
ASDU 8: Termination of general interrogation.
The feeder manager will accept:
•
ASDU 6: Time synchronization
•
ASDU 7: Initiation of general interrogation and
•
ASDU 20: General command.
The data in a message frame is identified by:
•
type identification
•
function type and
•
information number.
These are fixed for data items in the compatible range of the
protocol, for example, the trip of I> function is identified by:
type identification = 1, function type = 160 and information
number = 90. “Private range” function types are used for such
data items, which are not defined by the standard (e.g. the
status of the digital inputs and the control of the objects).
The function type and information number used in private
range messages is configurable. This enables flexible
interfacing to different master systems.
