8 • The DAC Inputs 026-1727 Rev 3
4.1.2. Wiring Digital Inputs on the
DAC
The digital inputs are located on a separate 22-pin
connector.
The DAC hardware provides a maximum of 20 opto-insulated digital inputs. However, for the DAC, only
the first ten inputs are currently available for use (see
Table 4-2). All digital inputs are voltage-free and are
intended to have dry contact devices connected.
Figure 4-5 - Transducer Wiring for +12V Powered Devices
CAUTION! Mis-wiring a sensor to the wrong
common can result in damage to the DAC.
CAUTION! Any inputs that are powered with
a voltage that differs from that supplied by the
DAC (+12V or +5V) must be powered
separately with another transformer in order to prevent
the inputs from malfunctioning or being damaged. Do
not use the same secondary of the controller's power to
power the sensors.
Terminal Number on
Connector
Name
1 24VAC Supply -
2 Probe Input 1
Table 4-3 - Analog Input Connector Terminal Numbers
3 Probe Input 2
4 Probe Input 3
5 Probe Input 4
6 Probe Input 5
7 Temperature Common
8 GND
9 24VAC Supply +
10 Probe Input 6
11 Probe Input 7
12 Probe Input 8
13 Probe Input 9
14 Probe Input 10
15 +5VDC
16 +12VDC
Figure 4-6 - Digital Input Connectors
Table 4-3 - Analog Input Connector Terminal Numbers
Figure 4-7 - Digital Input Wiring
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