Honeywell HC900 - UPDN Up;Down Function Block

Function Blocks
UPDN Up/Down Function Block
426 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
UPDN Up/Down Function Block
Description
The UPDN label stands for UP/DOWN Counter.
This block is part of the
Counters/Timers category.
Function
The output counts the number of rising edge logic transactions on the input to the block up to a preset value
(RPRE or LPRE). When the preset value is reached, a logic output (PREI) is enabled until a Reset input
(RST) resets the block.
Value may be set to increase to the preset value or decrease from the preset value.
Inputs
^X
= Positive Edge Detect Count Input
RPRE = Remote Preset
RST = ON resets the count
CNTDN = ON counts down
Outputs
OUT
= Output
PREI = Preset Indicator
Block properties
Double click on the function block to access the function block properties dialog box.