trd(SM412,D6000);
IF D6010<>D6002 THEN     D6010:=D6002;
    FOR ii:=0 TO 49 DO
        Chanliang(ii,8):=Chanliang(ii,7);
        Chanliang(ii,7):=Chanliang(ii,6);
        Chanliang(ii,6):=Chanliang(ii,5);
        Chanliang(ii,5):=Chanliang(ii,4);
        Chanliang(ii,4):=Chanliang(ii,3);
        Chanliang(ii,3):=Chanliang(ii,2);
    END_FOR ii;
END_IF;
IF M6007:=TRUE THEN
    Chengxuhao(D800,0):=D800;
    Chengxuhao(D800,1):=D801;
    Chengxuhao(D800,2):=Chengxuhao(D800,1)+1;
END_IF;
//*求和
FOR ii:=0 TO 49 DO
    FOR jj=2 TO 8 DO
        chanliang(ii,9):=chanliang(ii,9)+chanliang(ii,jj)
    END_FOR jj;
END_FOR ii;    
    
IF M401 THEN
    Z0:=Z0+1
    
    IF Z0>5 THEN    
        Z0:=4
    END_IF;    
END_IF;
IF M400 THEN
    Z0:=Z0-1;
    IF Z0<=0 THEN    
        Z0=0;
    
    END_IF;    
END_IF;    
D6008:=Z0*K10;

IF后面是比较。你写个（：=）这是赋值的意思