User guide

Page 37

Genesis II Installation Instructions

3-3.1.2 Digital Inputs

The Genesis II Direct Digital Controller’s eight Digital Input channels (Terminals 4 to 19) provide the

capability of directly interfacing to digital input signal sources such as pushbutton switches and relay

contacts.

Because each Digital Input channel is isolated, the power source for the signal must be external to the

controller. This signal source can be AC or DC. If the source is AC, it can be provided by the auxiliary

transformer.

Digital input signal power requirements are one of the following:

• 24VAC ±15%

• 24VDC ±15%

There are two terminals associated with each Digital Input channel. If an external DC signal source

is used, the even-numbered (le) terminal must be wired as positive and the odd-numbered (right)

terminal as negative.

Refer to Table 3-3 for Digital Input terminal number assignments. Signal names assigned to the

terminals are DI 1+/- through to DI 8+/-. DI stands for Digital Input, the numeral value represents the

channel number and the + or - sign indicates the signal polarity when using a DC signal power source.

Positive Side Negative Side

Terminal Signal Terminal Signal

4 DI 1+ 5 DI 1-

6 DI 2+ 7 DI 2-

8 DI 3+ 9 DI 3-

10 DI 4+ 11 DI 4-

12 DI 5+ 13 DI 5-

14 DI 6+ 15 DI 6-

16 DI 7+ 17 DI 7-

18 DI 8+ 19 DI 8-

Table 3-3: Genesis II DDC Input Signal Conditions