Sensor Interface
The analog expander allows the control of four separate analog input channels which can be used interface with
any industrial automation sensor that provides a 4-20mA or 0-10V output. The results from the sensor can be
used to control any number of programmable functions in the Protege system.
There are common requirements when wiring sensor inputs that must be observed to ensure the highest
possible performance is achieved.
⦁
All cables should be high quality overall screened instrumentation rated cable with the screen earthed at
one
end only.
⦁
Signal cables should be laid a minimum distance of 300mm from any source of interference including power
cables, high current conductors, switchgear, or any forms of electrical noise.
⦁
For two-wire sensor loops we recommend Austral standard cable B5102ES. For three-wire loops we
recommend Austral standard cable B5103ES.
⦁
It is recommended that you do not ground any current loop output, and use of a power supply that does not
require a ground connection is recommended.
⦁
If possible, signal-carrying cable that is exposed to harsh environments should include extra precaution
against lightning strikes.
We recommend operating the module and associated sensors using a non-grounded power supply unit. Before
removing ground connections for power supplies ensure that local regulations for the region allow this
connection.
Sensor Input 0-10V Interface
The analog expander allows the connection of voltage output sensors.
The acceptable signal range is from 0-10V. This is translated by the analog expander into a digital value which
can be used in the programmable functions and variable display in the Protege software. It is also possible to
connect any device which outputs a voltage between these values (e.g. 0-5V) and utilize the scaling functions
within the Protege system.
The following example shows the connection of a 0-10V output daylight sensor. This device has a single 0-10V
output that represents the current brightness of daylight in lux detected by the sensor device. In this example
the sensor has been connected to Input 1 on the analog expander. The wiring is equivalent for all available
analog inputs.
V-
V+
OV
V+ = +24VDC
V- = 24VDC GROUND
0V = OUTPUT VOLTAGE
0-10V OUTPUT DAYLIGHT SENSOR
0-5K / 0-50K LUX DEVICE
V-
1i
24V+
2i
3i
V-
4i
V-
ANALOG EXPANDER
PRT-ADC4-DIN | Protege DIN Rail 4 Channel Analog Input Expander | Installation Manual
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