Tgff Function Block - Honeywell UMC800 Reference Manual

Function Blocks

2.71 TGFF Function Block

Description
The TGFF label stands for Toggle Flip-Flop. This block is part of the Logic and Fast Logic categories. It
looks like this graphically on the Control Builder.
Function
Provides an ON state output when a digital input goes from OFF to ON and the previous state of the output
was OFF, and an OFF state output when the digital input goes from OFF to ON and the previous state of the
output was ON.
•
OUT = ON when ^TOG changes from OFF to ON and the previous state of OUT was OFF.
•
OUT = OFF when ^TOG changes from OFF to ON and the previous state of OUT was ON.
•
Reset sets output to OFF, regardless of current state.
Input
^TOG = Digital Input
RESET = Digital input ON
Output
OUT = Digital Output
Block Properties
Double click on the function block to access the function block properties dialog box.
Block Order (Read Only)
You can change the assigned execution order number by selecting "Execution Order" in the "Configure"
menu and arrange the order to suit your control strategy.
Example
Figure 2-75 shows a Function Block Diagram using a TGFF function block and how to tag the output.
208
OR
Fast Logic
Input = OFF output
Figure 2-75 TGFF Function Block Example
Function Block Reference Guide 3/99