ProSoft Technology MVI69-103M - Manual (Page 113)

Reference MVI69-103M ♦ CompactLogix or MicroLogix Platform
IEC 60870-5-103 Master Communication Module
ProSoft Technology, Inc. Page 113 of 131
November 3, 2008
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.
5.8 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.
Note: In addition, the full specification of a system may require individual selection of certain
parameters for certain parts of the system, such as the individual selection of scaling factors for
individually addressable measured values.
The selected parameters should be marked in the white boxes as follows:
Function or ASDU is not used
⌧ Function or ASDU is used as standardized (default)
R Function or ASDU is used in reverse mode
B Function or ASDU is used in standard and reverse mode
The possible selection (blank, X, R, B) is specified for each specific clause or
parameter.
A black check box indicates that the option cannot be selected in this companion
standard.
The pages in this section have been extracted from the 60870-5-103 ©
IEC:1997, pages 159 to 171.