OR
--


.. figure:: ../media/image975.png
   :figwidth: 4.33333in
   :align: center 

**Purpose**

To perform a logical OR operation.

**Procedure** 

The output becomes TRUE (=1) if at least one input signal is TRUE. Only when all input signals are FALSE does the output become FALSE (=0).

**Parameters** 

None.

**Remarks** 

None.

**Examples** 

Table 1 presents the possible output values that can result from two input signals. Table 2 presents the possible output values that can result from three input signals.

Table 1: Possible output values for two input signals

======== ======= ======= ======
Scenario input 1 input 2 Output
1        TRUE    TRUE    TRUE
2        TRUE    FALSE   TRUE
3        FALSE   TRUE    TRUE
4        FALSE   FALSE   FALSE
======== ======= ======= ======

Table 2: Possible output values for three input signals

======== ======= ======= ======= ======
Scenario input 1 input 2 input 3 Output
1        TRUE    TRUE    TRUE    TRUE
2        TRUE    TRUE    FALSE   TRUE
3        TRUE    FALSE   TRUE    TRUE
4        TRUE    FALSE   FALSE   TRUE
5        FALSE   TRUE    TRUE    TRUE
6        FALSE   TRUE    FALSE   TRUE
7        FALSE   FALSE   TRUE    TRUE
8        FALSE   FALSE   FALSE   FALSE
======== ======= ======= ======= ======

.. include:: substitutions_control.rst