Command transmission

Commands can be sent from the central station in control direction (to the substation).
A single command with type ID 45 (C_SC_NA_1) is used for controlling an application object that is transferred in monitoring direction as a single point (M_SP_NA_1, M_SP_TA_1 or M_SP_TB_1). A dual command (C_DC_NA_1) is used for controlling an application object that is transferred in monitoring direction as a double point (M_DP_NA1, M_DP_TA_1 or M_DP_TB_1), etc.

Configuration of the system parameters:

• No special system parameters need to be set;

Configuration of the application objects:

• The application objects must be configured as commands (data types in the control direction);
• The addresses of the information objects (IOAs) must correspond to the addresses in the control station;

Samples:

Single command with IOA = 10. The received value is copied into the flag range buffer, byte offset = 100, bit offset = 0.

F_iecInitAOEntry( C_SC_NA_1, 10, 0, 0, MAP_AREA_MEMORY, 100, 0, AODB[24] );

Double command with IOA = 20. The received value is copied into the flag range buffer, byte offset = 200, bit offset = 0..1.

F_iecInitAOEntry( C_DC_NA_1, 20, 0, 0, MAP_AREA_MEMORY, 200, 0, AODB[27] );

 Set point, scaled value with IOA = 60. The received value is copied into the flag range buffer, byte offset = 600..601, bit offset = 0.

F_iecInitAOEntry( C_SE_NB_1, 60, 0, 0, MAP_AREA_MEMORY, 600, 0, AODB[39] )