VAR_INPUT

bWrite     :BOOL;
bBlanking  :BOOL;
nRow       :UINT;
sData      :STRING(16)

Legend

bWrite: rising edge starts the function block

bBlanking: FALSE backlight on, TRUE backlight off, default is on (supported in all BX controllers from FW 1.15).

nRow: row in display 1 or 2.

sData: displayed character string

VAR_OUTPUT

bBusy      :BOOL;
bErr       :BOOL;
iErrId     :WORD;

Legend

bBusy: The function block is active as long it is TRUE.

bErr: Error bit.

iErrId: Error number.

ST sample program

Download (sample file)

PROGRAM MAIN
VAR
    fb_DispWrite1: FB_DispWrite;
   
i:                 INT;
    udiCounter:    UDINT;
    strCounter:    STRING;
    strLine:       STRING;
   k:              INT;
END_VAR

CASE i OF
0:  strCounter:=CONCAT('Counter :',UDINT_TO_STRING(udiCounter));
    fb_DispWrite1(bWrite:=TRUE , nRow:=1 ,sData:=strCounter );
    IF NOT fb_DispWrite1.bBusy THEN
        IF NOTfb_DispWrite1.bErr THEN
           fb_DispWrite1(bWrite:=FALSE);
           udiCounter:=udiCounter+1;
           i:=1;
        END_IF
    END_IF
1:  fb_DispWrite1(bWrite:=TRUE , nRow:=2 , sData:=strLine);
    IF NOT fb_DispWrite1.bBusy THEN
        IF NOTfb_DispWrite1.bErr THEN
           fb_DispWrite1(bWrite:=FALSE);
           k:=k+1;
           strLine:=REPLACE(' ','#',1,k);
           IF k=16 THEN
               k:=0;
           END_IF
           i:=0;
        END_IF
    END_IF
END_CASE

display_test.prx

Display of ASCII table

Example for the "&" sign (see row 1 column 7): 00100110_bin = 38_dec = 26_hex. In the PLC values this corresponds to '$26' (string.)

ASCII characters as PDF.

displayasci.pdf