Control Microsystems SCADAPack 32 - Interrupt Input; Wiring Example; Figure 7: Digital;Counter (DIN;COUNTERS) Input Wiring

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.
34
0
+
24V
–
DIN/Counter
2
1
5
6
7
8
P4
COM21
16Vac
+
Pulse Output
–
SW1
2
1
2
3
4
0
1
not used
Options
Filters
Figure 7: Digital/Counter (DIN/COUNTERS) Input Wiring
COUNTER 0 is being used as a counter in a low speed application. The low pass filter is enabled to
eliminate the high frequency noise inherent in mechanical relay contacts.
COUNTER 1 is being used as a low speed counter with an AC enabling signal. The low pass filter is
also enabled to filter AC.
COUNTER 2 is being used as a high speed counter with the low pass filter disabled.
7.2 Interrupt Input
The controller board has one Interrupt digital input. This input is labeled INT/Cntr on the P4
terminal connector. This input operates as a DC digital input and as a counter input.
For DC input the maximum input voltage is 28V and the minimum voltage required to turn the input
ON is 2.5V. For counter input the maximum frequency is 500Hz.
The INT/Cntr input can be used as both a digital input and a counter input in an application
program.
• For TelePACE applications use the CNTR Controller Interrupt Input register assignment to
read the INT/Cntr input as a counter and the DIN Controller Interrupt Input register assignment
to read the INT/Cntr input as a digital input.
• For ISaGRAF applications use the cntrint I/O connection to read the INT/Cntr input as a
counter input and the dinint I/O connection to read the INT/Cntr input as a digital input.
7.2.1 Wiring Example
The diagram below shows how to wire this input.
SCADAPack 32 Controller Hardware Manual
May 24, 2006
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