ZETRON 4000 Series, Installation Manual

Page: 85 / 418

85
Auxiliary I/O Card Installation (Optional)
Standard Input Connections
By making the connections shown in Figure 20 , the indicator on the operator console is
active when the switch is closed. The input circuitry is active low and does not require 12
VDC applied externally. The components shown to the right of the switch are part of the
AUX I/O card.
Figure 20: Standard Input Connection
Isolated Input Connections
To activate the isolated inputs, a current of 5-10 mA is typically required. (See Figure 21 .)
A 1 k  resistor in parallel with the inputs can be used with an external resistor to create
the proper divider.
Figure 21: Typical Isolated Input Connection
47K
10K
SW
5.1V
INPUT
TYPICAL CIRCUIT
024-0112A
+12V
Hardware on Aux I/O Card
Warning! Under no circumstances should an input current of 20 mA be
exceeded.
STOP
1M
10K
75 330
1
5.1V
+
1K
-
4N26
5
2
1
4
6
JP
+
INPUT
5V - 8V
+5V
024-0113A
Hardware on Aux I/O Card