CONTREX CX-1200 - Manual (Page 183)

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You can combine “AND’s” and “OR’s” to implement both the series and parallel connections.
LOAD 55 MaxFbSpd
OR 57 DrvNoRsp
AND 24 Tmr1 Out
OUT 101 DO_1
MaxFbSpd
55
DO_1
101
DrvNoRsp
57
Tmr1 Out
24
LOAD 55 MaxFbSpd
AND 24 Tmr1 Out
OR 57 DrvNoRsp
OUT 101 DO_1
MaxFbSpd
55
DO_1
101
DrvNoRsp
57
Tmr1 Out
24
The order of the program commands effect the outcome. The result of each command is placed in the Result
Register (R), which is then used in the next operation.
The exclusive “OR” command (“XOR”, “XOR NOT”) can be used to act on one of two true conditions, but
not if both are true at the same time. The truth table for the “XOR” and “XOR NOT” is given by (1 = true):
0 0 0 1
0 1 1 0
1 0 1 0
1 1 0 1
R Operand XOR XOR NOT
The following example implements an exclusive “OR” between Cntr1 Out and Cntr2 Out using ladder logic.
The program commands use standard “AND” and “OR” logic.