Ashida ADR111A, Instruction Manual

Page: 80 / 128

Doc ID : ADR111A_IM_01
Ref ID : ADR111A/IM/CS
Rev No. : 04
Page No. : 80 of 127
ADR111A /
ADR211A
7.2 IEC60-870-5-103
The specification IEC 60870-5-103 (Tele control Equipment and Systems Part 5 Section 103:
Transmission Protocols), defines the use of standards IEC 60870-5-1 to IEC 60870-5-5,
which were designed for communication with protection equipment.
This section describes how the IEC 60870-5-103 standard is applied to the ADR211A Relay.
It is not a description of the standard itself. The level at which this section is written assumes
that the reader is already familiar with the IEC 60870-5-103 standard.
This section should provide sufficient detail to enable understanding of the standard at a
level required by most users.
The IEC 60870-5-103 interface is a master/slave interface with the device as the slave
device. The device conforms to compatibility level 2, as defined in the IEC 60870-5-
103.standard.
The following IEC 60870-5-103 facilities are supported by this interface:
•
Initialization (reset)
•
Time synchronisation
•
Event record extraction
•
General interrogation
•
Cyclic measurements
•
General commands
7.3 Physical Connection and Link Layer
For connecting on IEC 60870-5-103 there are two options:
•
Front USB Port.
•
Rear serial port - for permanent SCADA connection via RS422/ RS485.
The IED address, Parity and Baud rate can be selected using the relay front panel.
7.4 Initialisation
Whenever the device has been powered up, or if the communication parameters have been
changed, a reset command is required to initialize the communications. The device will
respond to either of the two reset commands; Reset CU or Reset FCB (Communication Unit
or Frame Count Bit). The difference between the two commands is that the Reset CU
command will clear any unsent messages in the transmit buffer, whereas the Reset FCB
command does not delete any messages.
The device will respond to the reset command with an identification message ASDU 5. The
Cause of Transmission (COT) of this response will be either Reset CU or Reset FCB
depending on the nature of the reset command.
The relay will also produce a power up event, when the relay is powered up.