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Inputs
These RTU Open inputs accept the following signal types:
These
inputs...
1, 2
3, 5, 8, 9
6, 7, 10
11
Binary outputs
The RTU Open has 8 binary outputs. You can connect each output to a maximum of 24 Vac/Vdc. Each output is a
dry contact rated at 3 A, 24 V maximum, and is normally open.
To size output wiring, consider the following:
•
Total loop distance from the power supply to the controller, and then to the controlled device
NOTE Include the total distance of actual wire. For 2-conductor wires, this is twice the cable length.
•
Acceptable voltage drop in the wire from the controller to the controlled device
•
Resistance (Ohms) of the chosen wire gauge
•
Maximum current (Amps) the controlled device requires to operate
Analog outputs
The RTU Open has 2 analog outputs that support voltage or current devices.
AO-1 - 2-10 Vdc or 4-20 mA (Configure on jumper J3)
AO-2 - 0-10 Vdc or 2-10 Vdc
NOTE The controlled output device must share the same ground as the controller. When used as a 4-20 mA
output, the load must have an input impedance of 500 Ohms or less. If the output is used as a voltage type
output, then the load impedance must be 10K ohms or greater.
RTU Open v3
Installation and Start-up Guide
Support this
signal type...
4-20 mA
Binary (24 Vac)
Thermistor
100k Potentiometer
Description
The input resistance on the positive (+) terminal is 250 Ohms.
The Aux Power Out terminal is capable of supplying 24 Vdc to a
4-20 mA transducer, but the total current demanded must not
exceed 40 mA. If the voltage measured from the Aux Power Out
terminal to Gnd is less than 18 Vdc, you need to use an external
power supply.
24 Vac voltage, resulting in a 25 mA maximum sense current
when the contacts are closed
10 kOhm at 77°F (25°C)
Typically used for 33CZT56SPT Setpoint Offset Potentiometer
15
Installing the RTU Open
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