Woodward MRM4, Руководство пользователя

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Communication Protocols
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Transmission of Disturbance Data.
Initialization
The communication has to be reset by a Reset Command each time that the device is turned on or that
communication parameters have been changed. The “Reset CU” Command resets. The relay acts on both
Reset Commands (Reset CU or Reset FCB).
The relay acts on the reset command by an identification signal ASDU 5 (Application Service Data Unit), as a
reason (Cause Of Transmission, COT) for the transmission of the answer either a “Reset CU” or a “Reset FCB”
will be sent depending on the type of the reset command. This information can be part of the data section of the
ASDU-signal.
Name of the Manufacturer
The section for the identification of the software contains three digits of the device code for the identification of
the device type. Beside the upper mentioned identification number the device generates a communication start
event.
Time Synchronization
Time and date of the relay can be set by means of the time synchronization function of the IEC60870-5-103
protocol. If the time synchronization signal is send out with a confirmation request, the device will answer with a
confirmation signal.
Spontaneous Events
The events that are generated by the device will be forwarded to the master with numbers for standard function
types / standard information. The data point list comprises all events that can be generated by the device.
Cyclic Measurement
The device generates on a cyclic base measured values by means of ASDU 9. They can be read out via a class
2 query. Please take into account that the measured values will be send out as multiples (1.2 or 2.4 times the
rated value). How to set 1.2 or 2.4 as multiplier for a value can be taken from the data point list.
The parameter “Transm priv meas val” defines if additional measurement values should be transmitted in the
private part. Public and private measured values are transmitted by ASDU9. That means that either a “private”
or a “public” ASDU9 will be transmitted. If this parameter is set, the ASDU9 will contain additional measured
values that are an enhancement of the standard. The “private” ASDU9 is send with a fixed function type and
information number that does not depend the type of device. Please refer to the data point list.
Commands
The data point list comprises a list of the supported commands. Any command will be responded by the device
with a positive or negative confirmation. If the command is executable, the execution with the corresponding
reason for the transmission (COT) will be lead in at first, and subsequently the execution will be confirmed with
COT1 within a ASDU9.
Disturbance Recording
The disturbances recorded by the device can be read out by means described in standard IEC60870-5-103.
The device is in compliance with the VDEW-Control System by transmission of an ASDU 23 without disturbance
records at the beginning of an GI-Cycle.
A disturbance record contains the following information:
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Analog Measured Values, IL1, IL2, IL3, IN, Voltages VL1, VL2, VL3, VEN;
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Binary States, transmitted as marks, e.g. Alarms and Trips; and
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The Transmission ratio will not be supported. The transmission ratio is included in the “Multiplier”.
Blocking the Transmission Direction
EN MRM4 01/11 Page 205