CONTREX CX-1200 - Manual (Page 184)

5 - 91
Cntr1 Out
32
DO_1
101
Cntr2 Out
33
Cntr2 Out
33
Cntr1 Out
32
32 Cntr1 Out
33 Cntr2 Out
33 Cntr2 Out
32 Cntr1 Out
0 S0
101 DO_1
LOAD
AND NOT
LOAD
AND NOT
OR
OUT
This programming can be greatly simplified with the “XOR” command as follows.
Cntr1 Out
32
DO_1
101
Cntr2 Out
33
Cntr2 Out
33
Cntr1 Out
32
32 Cntr1 Out
33 Cntr2 Out
101 DO_1
LOAD
XOR
OUT
The “AND/OR” programming of the exclusive “OR” function above illustrates more complicated logic than
we have seen thus far. It involves not only the use of normally-closed contacts, but the use of a second
“LOAD” command to start the second branch, or sub-rung. If you understand the stack movement, the
programming should seem quite obvious. Consider the following example:
DI_8
8
DO_1
101
DI_ 9
9
DI_10
10
DI_11
11
8 DI_8
9 DI_9
10 DI_10
11 DI_11
0 S0
101 DO_1
LOAD
OR
LOAD
OR
AND
OUT