Honeywell HC900 - TAHD Track and Hold Function Block

Function Blocks
TAHD Track and Hold Function Block
382 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
TAHD Track and Hold Function Block
Description
The TAHD label stands for Track and Hold.
This block is part of the
Auxiliary category.
Function
Provides an output that tracks the value of the input (X), when a digital input signal (TC) is On; or when
TC is OFF, holds output at last value of X.
• If TC = ON, then: OUT = X (TRACK)
• If TC = OFF, then: OUT = Last value of X (HOLD)
Input
TC
= Track command signal, when turned ON.
X = Value to be tracked.
Output
OUT
= track and hold value of X
Block properties
Double click on the function block to access the function block properties dialog box.