3.2.6 Step position
Tap changer step position information (-64…63) is derived from the IEC 61850 class
BCS (binary controlled step position).
• BCS.ValWTr.stVal
Table 7: Step position
Type ASDU
GI 5 M_ST_NA_1 Step position
Event 32 M_ST_TB_1 Step position with
CP56Time2a
3.2.7 Single command
Single-command control operations can be performed towards SPC (controllable
single point) data class objects. Only direct controls are allowed.
• SPC.Oper.ctlVal
Table 8: Single command
Type ASDU
Control 45 C_SC_NA_1 Single command
Control 58 C_SC_TA_1 Single command with
CP56Time2a
3.2.8 Double command
Double-command control operations can be performed towards DPC (controllable
double point) data class objects. Direct controls are always possible. Two-step
select-execute controls are also possible if the target DPC object allows it.
That is, the DPC control model setting must in such case be defined as
SBO_WITH_ENHANCED_SECURITY. There are two different control objects available
for the direct and select-execute alternatives.
• DPC.Oper.ctlVal
Table 9: Double command
Type ASDU
Control 46 C_DC_NA_1 Double command
Control 59 C_DC_TA_1 Double command
with CP56Time2a
Vendor-specific implementation 2NGA001859 A
18 REX615
IEC 60870-5-104 Communication Protocol Manual
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