====== Switch-on/off delay ======

{{:en:mervis-ide:35-help:bd14.png}}

===== Block name =====

BD14_SWITCHONOFFDELAY

===== ST call =====

<code st-iec>
PROGRAM BD14_TEST
VAR 
  IN1,OUT1: BOOL;
 FB: LIB.CORE.V1_1.BD14_SWITCHONOFFDELAY;
END_VAR
 FB(IN:=IN1);
    OUT1:=FB.OUT;
END_PROGRAM
</code>

===== Library =====

LIB\CORE

===== Version =====

V1.1

===== Description =====

The delay block transforms the input signal //IN// so that each rising edge longer than //TON// is delayed by //TON// and each falling edge longer than //TOFF// is delayed by //TOFF//. The //TRES// parameter gives time remaining to the end of delay. The //TRES// value can be reset by a rising edge on the //RESET// input.

{{:en:mervis-ide:35-help:bd14_1.png}}

===== Inputs =====

|Input          |Type|Description                                                  |Default value|
|IN             |BOOL|Input value                                                  |True         |
|RESET          |BOOL|Resets the //TRES//.////                                     |False        |
|IGNORESTARTEDGE|BOOL|If //TRUE// the block is not initialised after start////.////|False        |
|TOFF           |TIME|Falling edge delay (30 s by default).                        |30s          |
|TON            |TIME|Rising edge delay (30 s by default).                         |30s          |

===== Outputs =====

|Output|Type|Description                       |
|OUT   |BOOL|Output signal                     |
|TRES  |TIME|Time remaining to the end of delay|

===== Application example =====

{{:en:mervis-ide:35-help:bd14_example.png}}\\


The block is used to smoothe the binary signal, it is actually a digital filter. The most frequent usage is in cascade controllers to delay the activation of a next cascade stage together with delayed switch-off to make the system more stable.

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===== Older versions  =====

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Version V1.0 is flagged as BROKEN. It contained an error of IGNORESTARTEDGE input. Valu on this input during firt cycle of program was not reflecter even if the function block was set correctly.