PrevValue Function Block

The Prev Value function block is used to determine the change from the previous DDC cycle.

Figure 1: PrevValue Function Block

Figure 2: PrevValue Property Sheet

Input

Input Name

Description

In

This is 32-bit floating point input slot.

Table 1: Input of PrevValue Function

Outputs

Output Name

Description

Out

In

Out Previous

Value from previous DDC cycle from In.

Out Deviation

Value from deviated DDC cycle from In.

Table 2: Outputs of PrevValue Function

Outputs

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.

Out Previous:To enable or disable the Out Previous feature.

Out Deviation:To enable or disable the Out Deviation feature.

Table 3: Parameters of PrevValue Function

Examples

If any change in In, the Out Previous is set to the previous input value and Out deviation is set to "true".

Figure 3:PrevValue Function Block

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