GEK-106310AB F650 Digital Bay Controller F-7
APPENDIX F F.1 IEC 60870-5-103 PROTOCOL
F
F.1.2 APPLICATION LEVEL
1. Application Functions
The unbalanced transmission mode of the protocol is used to avoid the possibility that more than one protection equipment
attempts to transmit on the channel at the same time, over the RS485 backside port.
Data is transferred to the primary or control station (master) using the "data acquisition by polling" principle. Cyclically, the
master will request class 2 data to the secondary station (slave). When slave has class 1 data (high priority) pending, the
ACD control bit will be set to 1 demanding the master to request for that data. Periodically, the master could send a General
Interrogation in order to update the complete database.
The measurands will be send to the primary station as a respond to class 2 request. There will be a setting (0-60 min) in
order to configure the desired interval, where 0 means transmission as fast as possible.
The following functions are supported:
• Initialization
• General Interrogation
• Synchronization
• Commands transmission
2. Type identification
The implemented Type Identification values are listed below:
TYPE IDENTIFICATION UI8[1..8] <1..255>
<1..31> := definitions of this companion standard(compatible range)
<32..255>:= for special use (private range)
Information in monitor direction:
<1>:= time-tagged message
<3>:= measurands I
<5>:= identification
<6>:= time synchronization
<8>:= general interrogation termination
<9>:= measurands II
Information in control direction:
<6>:= time synchronization
<7>:= general interrogation
<20>:= general command
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