•
For TelePACE applications use the
AIN Controller RAM Battery V
register assignment to read
the lithium battery voltage.
•
For ISaGRAF applications use the
ainbatt
I/O connection to read the lithium battery voltage.
3.4
Digital /Counter Inputs
The SCADAPack 32P has three Digital / Counter inputs. These inputs are labeled
DIN\Counter
0, 1
and 2 on the P4 terminal connector. These inputs operate as AC or DC digital inputs or as counter
inputs.
•
For DC inputs the maximum input voltage is 30V and the minimum voltage to turn the input ON
is 10V.
•
For AC inputs the maximum input voltage is 24Vrms and the minimum voltage to turn the input
ON is 10Vrms.
•
For counter inputs the maximum frequency is 5KHz with the filters off.
The
DIN/Counter
inputs can be used as both digital inputs and counter inputs in an application
program.
•
For TelePACE applications use the
CNTR Controller Counter Inputs
register assignment to
read the DIN/Counter inputs as counters and the
DIN Controller Digital Inputs
register
assignment
to read the DIN/Counter inputs as digital inputs
•
For ISaGRAF applications use the
cntrCtrl
I/O connection to read the DIN/Counter inputs as
counters and the
dinCtrl
I/O connection to read the DIN/Counter inputs as digital inputs.
Each of the three digital / counter (DIN/Counters) inputs on the SCADAPack 32P controller has a
switch selectable filter, which limits the maximum input frequency. Filtering limits the maximum
digital input or counter frequency to approximately 30Hz. Refer to section
for filter selection information.
•
Use a filter for 50 or 60Hz digital inputs and for low speed counting applications that experience
problems due to contact bounce.
•
Do not use filtering for high speed counting applications.
An example of wiring each type of input is shown in the diagram below.
Connection Example:
SW1 Filter 0 is ON to debounce contacts.
SW1 Filter 1 is ON to filter AC.
SW1 Filter 2 is OPEN for high speed counting.
3
4
0
+
24V
–
DIN/Counter
2
1
5
6
7
8
P4
COM
2
1
16Vrms
+
Pulse Output
–
SW1
2
1
2
3
4
0
1
not used
Options
Filters
SCADAPack 32P Controller Hardware Manual
May 26, 2006
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