ProSoft Technology MVI46-103M - Manual (Page 172)

MVI46-103M ♦ SLC Platform Reference
IEC 60870-5-103 Master Communication Module
Page 172 of 187 ProSoft Technology, Inc.
September 12, 2006
Bytes Description Spec
1 Common address of ASDU
1 Function Type = GLB (255)
1 Information number
7 7-Octet binary time 7.2.6.29
Type 7 - Initiation of general interrogation
Bytes Description Spec
1 Value of 7
1 0x81
1 COT
1 Common address of ASDU
1 Function Type = GLB (255)
1 Information number
1 SCN (scan number 0-255) 7.2.6.21
Type 20 - General command
Bytes Description Spec
1 Value of 20
1 0x81
1 COT
1 Common address of ASDU
1 Function Type
1 Information number
1 DCO (1=Off, 2=On) 7.2.6.4
1 RII 7.2.6.19
RII is not to be processed within the protection equipment, but to be used as a
SIN of the return message.
7.9 Protocol Interoperability Documentation
This companion standard presents sets of parameters and alternatives from
which subsets have to be selected to implement particular telecontrol systems.
Certain parameter values, such as the number of octets in the COMMON
ADDRESS of ASDUs represent mutually exclusive alternatives. This means that
only one value of the defined parameters is admitted per system. Other
parameters, such as the listed set of different process information in command
and in monitor direction allow the specification of the complete set or subsets, as
appropriate for given applications. This clause summarizes the parameters of the
previous clauses to facilitate a suitable selection for a specific application. If a
system is composed of equipment stemming from different manufacturers it is
necessary that all partners agree on the selected parameters.