Automating Manufacturing Systems - Process Control and ...

plc st - 19.12
IF (I:000/00 = 1) THEN
O:001/00 := 1;
ELSIF (I:000/01 = 1 AND T4:0/DN = 1) THEN
O:001/00 := 1;
IF (I:000/02 = 0) THEN
O:001/01 := 1;
END_IF;
ELSE
O:001/01 := 1;
END_IF;
Figure 19.18
Example With An If Statement
• The example below will set output bits 00-03 depending upon the value of the
integer in N7:0, if the value is not between 0 and 3 the outputs will all go off.
CASE N7:0 OF
0:
O:000/00 := 1;
1:
O:000/01 := 1;
2:
O:000/02 := 1;
3:
O:000/03 := 1;
ELSE
O:000 := 0;
END_CASE;
Figure 19.19
Use of a Case Statement
• The example below accepts a BCD input from (I:000) and will use it to change