OR Logic Operation
As long as the "logic object" has the value "0", switching can be carried out as usual using the address of the "switch object". Set staircase times continue to be observed. Switching on via the "logic object" takes effect immediately.
|
Object Logical input |
Object Switching |
Result |
|---|---|---|
|
0 |
0 |
0 |
|
0 |
1 |
1 |
|
1 |
0 |
1 |
|
1 |
1 |
1 |
Example:
An OR logic operation can be used to implement a power-off lock or Central ON function (e.g. light for cleaning buildings). If the value of the "switch object" is also set to "1" locally, the relay remains switched on when the power-off lock is withdrawn (value change of logic object from 1 to 0).
OR logic operation;
Value of logic object
after bus voltage recovery: 0
OR logic operation;
Value of logic object
after bus voltage recovery: 1
The logic object is preset to the value "1" after a RESET. The actuator will switch on the output immediately. The OR logic function is only reset by a "0" telegram on the logic object.