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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.
Содержание HC900
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