====== Input with Range Monitoring and Value Transformation (v1.2) ======

{{:cs:mervis-ide:35-help:safeinputwithtransform_v1.1.png}}

==== Full Name ====

Lib.Mervis.v1_2.SafeInputWithTransform

===== Description =====

The auxiliary block is used for monitoring the range of the input variable, filtering it, and potentially switching to a backup value. The output value is recalculated using linear transformation.

==== Required Project References ====

  * Lib.Mervis

===== Usage in ST =====

<code>
program test
    var
        inp: lib.mervis.v1_2.SafeInputWithTransform;
    end_var

    inp();
end_program
</code>

===== Input and Output Description =====

|Inputs            |Name                                                   |Data Type|Retain|Mandatory Connection                                                       |Meaning|
|AlarmPriority     |[[..:..:alarms_alarmprioritytype.htm|AlarmPriorityType]]|No       |No    |Class of generated alarm                                                    |      |
|Input             |real                                                    |No       |Yes   |Input value                                                                 |      |
|MeasuredMin       |real                                                    |No       |No    |Minimum measured value                                                      |      |
|MeasuredMax       |real                                                    |No       |No    |Maximum measured value and upper alarm threshold                            |      |
|RealMin           |real                                                    |No       |No    |Real value corresponding to //MeasuredMin//                                 |      |
|RealMax           |real                                                    |No       |No    |Real value corresponding to //MeasuredMax//                                 |      |
|SafeValue         |real                                                    |No       |No    |Backup value in case of failure                                             |      |
|FilterTimeConstant|time                                                    |No       |No    |Time constant of the filter for value filtering                             |      |
|MinimumCorrection |real                                                    |No       |No    |Subtracted value from //MeasuredMin// determining the lower alarm threshold |      |
|Override          |bool                                                    |No       |No    |Input for forced switching to backup value                                  |      |


|Outputs|Name                             |Data Type               |Meaning|
|Alarm  |[[..:alarmtrigger.htm|AlarmTrigger]]|Trigger variable for alarm|      |
|Output |real                             |Output                   |      |


===== Detailed Function Description =====

The block is used to handle the value, for example from sensors, where in case of its failure it is replaced by a safe value to prevent inappropriate action by the following blocks. If the //Override// input is true, it forces a switch to the safe value and simultaneously triggers an alarm state.

===== Versions =====

{{indexmenu>.105-safeinputwithtransform#2}}