F_iecGetDCS
This help function can be used to mask the double command state in a byte variable. In the TwinCAT PLC the double command state occupies 2 bits of process data. In a byte variable, the state of up to 4 double commands can therefore be mapped.
Syntax
FUNCTION F_iecGetDCS: E_IEC870_5_101DCS
VAR_INPUT
in : BYTE;
offset : UDINT(0..3);
END_VAR
Inputs
in: Variable, from which the double command state is to be masked.
offset: Bit offset of the double command state.
Sample in ST
The state of the four double commands is masked.
PROGRAM MAIN
VAR
memarea AT%M* : ARRAY[0..10] OF BYTE;
eDCS : E_IEC870_5_101DCS;
ENd_VAReDCS := F_iecGetDCS( memarea[0], 0 );
eDCS := F_iecGetDCS( memarea[0], 1 );
eDCS := F_iecGetDCS( memarea[0], 2 );
eDCS := F_iecGetDCS( memarea[0], 3 );Requirements
Development environment | Target system type | PLC libraries to be linked (category group) |
|---|---|---|
TwinCAT v3.1.4012.0 | PC oder CX (x86, x64, Arm®) | Tc2_IEC60870_5_10x (Communication->IEC60870) |