EqualNull Function Block

The Equal Null function block detects if the output is null.

Figure 1: EqualNull Function Block

 

Figure 2: Equal - Property Sheet

Output comes null, when In is null.

Figure 3: EqualNull Logic Diagram

Input

Input Name

Description

In

This is 32-bit floating point.

Table 1: Input of EquallNull Function

Output

Output Name

Description

Out

Output = "null".

Table 2: Output of EqualNull Function

Parameter

Parameter Name

Description

Out Save

Master Sync Enabled : If you set it to "true" the last output will be set as output for one cycle after the controller restarts. The application can use it to return to the same state before the controller restart.

Out: To enable or disable the Out feature.

Table 2: Output of EqualNull Function

Examples

Can be used for example as a frost protection level while 0 - 100% is the level and "null" means that there is no frost condition. Can also be used for sensor values to indicate the the current sensor value is not valid due to broken sensor or missing communication over BACnet.

If the Input is equals to "null", Output is set to "true".

 

Figure 4: Equal null Function Block

Refer to General Description for general information about IRMN4 Function Blocks.