Negative Count Direction - Eaton easyE4 series Manual

6. Function blocks
6.1 Manufacturer function blocks
238

Negative count direction

If the rising edge at channel B is detected before the rising edge at channel A, the
counter will count up. This means that the counter will be decremented by 1 after there
is a rising edge at channel A followed by a rising edge at channel B. The counter relay's
result will be decremented and output at output QV.
Figure 135: CI function block counting down; QV=QV-4
NOTICE
Avoid unforeseeable switching states.
Switch C, CF, CH, CI function blocks only at one single point in the pro-
gram.
Otherwise, previous counts will be overwritten.
The function block and its parameters
Function block inputs
(Bit)
EN
SE
RE
(DWord)
SH
SL
SV
Assigning operands
You can assign the following operands to the function block inputs that are numeric
inputs.
Operands
Constant, timer constant
MD, MW, MB - Markers
easyE4 11/18 MN050009 EN www.eaton.com
Description
1: Activates the function block.
The starting value at SV is applied
whenever there is a rising edge at
this input
Reset
1: QV=0
Upper Threshold Value
Lower threshold value
Start value (Pre Set)
Value inputs
x
x
Note
The checkbox for the
Function block release by EN
is necessary
parameter must first be enabled
Integer value range:
-2,147,483,648 to +2,147,483,647