LTAB
----


.. figure:: ../media/image1032.png
   :figwidth: 4.19792in
   :align: center 

**Purpose**

Generates a time dependent logical value (TRUE or FALSE) which can be used by other control components.

**Procedure** 

This component is equivalent to the ON_OFF action table as used in some hydraulic components, although there is one difference. The time axis is not absolute anymore but relative to the instant at which the input signal becomes TRUE. When the input channel becomes FALSE, the output will be FALSE and the table is reset.

**Parameters** 

================== ===== ==== ===== ======= =======
Parameter          input unit range default remarks
================== ===== ==== ===== ======= =======
On(1)/Off(0) table table                    
================== ===== ==== ===== ======= =======

**Remarks** 

If no logical signal line is connected to the input channel a value of TRUE is assumed and the effect is the same as with the action tables.

The table is a block function; the table value will be used after (!) the specified point in time (see example).

**Examples** 

The input table of LTAB is:

==== ============
Time On(1) Off(0)
     
(s)  (-)
==== ============
0.0  1.0
2.0  0.0
5.0  1.0
8.0  0.0
==== ============

Next two figures show the output channel of LTAB with different used time steps

============================= ==============================
|image267|                    |image268|
Fig 1a:output with dt = 1.0 s Fig 1b: output with dt = 0.1 s
============================= ==============================

.. include:: substitutions_control.rst