F_iecGetDPI

This help function can be used to mask the double point information of a byte variable. In the TwinCAT PLC the double point information occupies 2 bit of process data. In a byte variable, the information of up to 4 double points can therefore be mapped.

Syntax

FUNCTION F_iecGetDPI: E_IEC870_5_101DPI
VAR_INPUT
    in     : BYTE;
    offset : UDINT(0..3);
END_VAR

Inputs

in: Variable, from which the double point information is to be masked.

offset: Bit offset of a double point information.

Sample in ST

The information of the four double points is masked.

PROGRAM MAIN
VAR
    memarea AT%M* : ARRAY[0..10] OF BYTE;
    eDPI          : E_IEC870_5_101DPI;
ENd_VAR

eDPI := F_iecGetDPI( memarea[0], 0 );
eDPI := F_iecGetDPI( memarea[0], 1 );
eDPI := F_iecGetDPI( memarea[0], 2 );
eDPI := F_iecGetDPI( 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) Tc2_SerialCom (Communication->Serial) Tc2_TcpIp (Communication->TcpIp) Tc2_Utilities (System)