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.