Example

POU header

All input and output variables used for programming this function have been declared in the POU header. The same POU header is used for all programming languages.

	VAR 
		bResetReceiveBuffer: BOOL:=FALSE;
		wDummy: WORD:=0;
	END_VAR

LD body

BODY
    WORKSPACE
        NETWORK_LIST_TYPE := NWTYPELD ;
        ACTIVE_NETWORK := 0 ;
    END_WORKSPACE
    NET_WORK
        NETWORK_TYPE := NWTYPELD ;
        NETWORK_LABEL :=  ;
        NETWORK_TITLE :=  ;
        NETWORK_HEIGHT := 9 ;
        NETWORK_BODY
B(B_F,F159_MTRN!,,13,3,21,9,,?DEN?Ds_Start?Dn_Number?Dd_Port?AENO);
B(B_VARIN,,wDummy,11,5,13,7,);
B(B_VARIN,,0,11,6,13,8,);
B(B_VARIN,,1,11,7,13,9,);
B(B_CONTACT,,bResetReceiveBuffer,5,4,7,6,R);
B(B_COMMENT,,Prepares the receive buffer for COM port 1 to receive the next data,2,1,22,3,);
L(1,5,5,5);
L(7,5,13,5);
L(1,0,1,9);
        END_NETWORK_BODY
    END_NET_WORK
END_BODY

ST body

if (DF(bResetReceiveBuffer)) then
   (* Clears the receive buffer of the COM1 port of the FP-SIGMA *)
   F159_MTRN(s_Start := wDummy, n_Number :=0, d_Port :=1);
end_if;