Innotech Genesis V4 System - Manual (Page 33)

Installation Instructions for Innotech Genesis Systems
Edition 011100 3-7
3-3.1.4. Analogue Inputs. The Genesis II Digital Controller’s eight analogue input
channels (Terminals 21-36) allow the direct interface of various analogue inputs, such as
Thermistor, 0-10Vdc, 0-5Vdc and 4-20mA 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 (Section 4).
CAUTION
SPECIAL CONSIDERATION MUST BE MADE WHEN USING
LOOP-POWERED 4-20MA INPUTS. BECAUSE THIS TYPE OF
INPUT DRAWS 20MA FROM THE DIGITAL CONTROLLER, A
MAXIMUM OF TWO INPUTS OF THIS TYPE MAY BE USED.
THIS TYPE OF INPUT MUST NOT BE USED ON LOCAL OR
REMOTE EXPANSION MODULES.
NOTE
Terminals 19 and 20 (Figure 3-2) are provided for terminating
analogue cable screens.
There are two terminals associated with each of the eight analogue input channels.
Normally, the odd-numbered (positive) terminal is used for the active analogue input signal
from the sensor. The even-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 19 or 20.
Refer to Table 3-4 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.
Table 3-4. Genesis II Digital Controller Analogue Inputs.
TERMINAL SIGNAL TERMINAL SIGNAL
ACTIVE REFERENCE
21 AI1+ 22 AI1
−
23 AI2+ 24 AI2
−
25 AI3+ 26 AI3
−
27 AI4+ 28 AI4
−
29 AI5+ 30 AI5
−
31 AI6+ 32 AI6
−
33 AI7+ 34 AI7
−
35 AI8+ 36 AI8
−