Innotech Genesis II Digital Controller (v5) - Manual (Page 39)

Page 39
Genesis II Installation Instructions
© Mass Electronics Pty Ltd 2010 Chapter 3 – Electrical Installation
3-3.1.4 Analogue Inputs
The Genesis II Direct Digital Controller’s eight Analogue Input channels (Terminals 22-37) allow
the direct interface of various analogue inputs, such as Thermistor, 0-10VDC, 0-5VDC and 4-20 mA
signals. Each Analogue Input channel is configured to the type of input by the use of Analogue Input
Signal Conditioners (AISCs). These are small plug inserts installed during system commissioning (see
Commissioning ).
Terminals 20 and 21 are provided for terminating Analogue Cable Screens.
NOTE
Special consideration must be made when using loop-powered 4-20 mA inputs. As this type of input draws 20 mA
from the Digital Controller, a maximum of two inputs of this type may be used. This type of input must not be used
on Remote Expansion Modules.
IMPORTANT
There are two terminals associated with each of the eight Analogue Input channels. Normally, the
even-numbered (positive) terminal is used for the active Analogue Input signal from the sensor. The
odd-numbered (negative) terminal is used to provide the stimulation for the sensor or a voltage
reference (such as 0 Volts) for an active transducer.
Due to the sensitivity of the Analogue Input signals, screened cable must be used. The screens
should be terminated at Terminals 20 or 21.
Refer to Table 3-5 for Analogue Input terminal number assignments. Signal names assigned to the
terminals are AI1+/- through AI8+/-. AI stands for Analogue Input; the numeral represents the channel
number. The + indicates the active signal and the - indicates the signal reference/return.
Active Reference
Terminal Signal Terminal Signal
22 AI 1+ 23 AI 1-
24 AI 2+ 25 AI 2-
26 AI 3+ 27 AI 3-
28 AI 4+ 29 AI 4-
30 AI 5+ 31 AI 5-
32 AI 6+ 33 AI 6-
34 AI 7+ 35 AI 7-
36 AI 8+ 37 AI 8-
Table 3-5: Genesis II DDC Analogue Inputs