COND
----


.. figure:: ../media/image916.png
   :figwidth: 4.3125in
   :align: center 

**Purpose**

Compares the value from the input channel with a set value.

**Procedure** 

The (measured) value at the input channel is compared with the set value. The type of comparison is chosen by the ‘Logical operator’.

**Parameters** 

================== =================== ==== ===== ======= =======
Parameter          input               unit range default remarks
================== =================== ==== ===== ======= =======
Logical operator   LT (less than)/                        
                                                          
                   GT (greater than)/                     
                                                          
                   LE (less equal)/                       
                                                          
                   GE (greater equal)/                    
                                                          
                   EQ (equal)/                            
                                                          
                   NE (not equal)                         
Set value          real                                   
Reset time (true)  real                [s]        0       
Reset time (false) real                [s]        0       
================== =================== ==== ===== ======= =======

**Remarks** 

The condition must hold for a period longer than the ‘reset time’ before the output will switch its original value. If the condition does not hold for a period longer than the ‘reset time’ then the output will keep its original value and the timing period will be restarted.

**Examples** 

.. figure:: ../media/image917.png
   :figwidth: 3.14583in
   :align: center 

   Control scheme



Figures :numref:`fig-1-cond` and :numref:`fig-2-cond` show the output when both ‘reset times’ are not used (0 seconds).

.. _fig-1-cond:
.. figure:: ../media/image918.png
   :figwidth: 2.77083in
   :align: center

   variation of Head measured by Sensor

.. _fig-2-cond:
.. figure:: ../media/image919.png
   :figwidth: 2.77083in
   :align: center

   Output of COND and LTAB


Figure :numref:`fig-3-cond` shows the output when ‘reset time (true)’ is set to 5 seconds and ‘reset time (false)’ is set to 2 seconds.

.. _fig-3-cond:
.. figure:: ../media/image920.png
   :figwidth: 2.77083in
   :align: center

   Output of COND including reset times (true =5 s, false = 2s)


.. include:: substitutions_control.rst