
139-0498-0114
Chapter Four--Wiring
14
Figure 4-3: Digital I/O Remote Switch
and Sensor Wiring
Momentary OFF
Contact Switch
Maintained
Contact Switch
Light Sensor for
Zone Control
RJ-25 6P6C Flat Cable
to next I/O Board
Momentary ON
Contact Switch
RJ-25 6P6C Flat Cable
to I/O Port on Controller
24 VDC LED
Indicator
24 VDC LED
Indicator
Switches or sensors being used to control either sequenced
or grouped zones are to be connected to the Digital I/O three-
position spring-clamp headers. Each header can accommodate
one input device (switch, sensor, relay) and one output device
(indicator) maximum.
The center terminal of each Digital I/O header is used as a 24VDC
source. The input terminal is triggered when connected through
a remote device to the 24VDC source. The output terminal
activates a remote device by pulling down from 24VDC to 0VDC
and creating current ow.
To assign both an On and O function for one zone would
require two input terminals and occupy two I/O headers. Six (6)
Digital I/O headers are located on the left side of the Controller
board. If more connections are required for multiple zone
control, additional I/O Expander boards can be added. Each
I/O Expander board provides an additional 16 headers for a
maximum total of 38 input control sources and output indicators.
1
2
3
4
5
6
7
8
10
11
12
13
14
15
16
I/O Port
I/O Port
9
OUT
24V
IN
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