Issue
How to connect and configure current inputs to a UI module?
Product Line
EcoStruxure Building Operation
Environment
- Building Operation I/O Module 16 Ch UI (UI-16)
- Building Operation I/O Module 8 Ch UI/4 Ch DO (Form C) (UI8-DO-FC-4)
- Building Operation I/O Module 8 Ch UI/4 Ch AO (UI8-AO-4, UI-8/AO-V-4)
- Building Operation MP-C, MP-V, RP-C, IP-IO
Cause
How are Current inputs connected and configured?
Resolution
To connect and configure a current input to a SmartX device no additional external resistors are required, the internal resistor in the SmartX device is automatically put into the circuit by selecting "Current Input" when creating the input object, there are no DIP switches to change as in some other products.
An external Power supply will be required to provide the current in the circuit through the sensor and into the UI input. 24V DC supplies are usually used to power the sensor & provide the current drive.
Further information regarding the SmartX device's internal resistor can be found in the Hardware Reference Guide.
Example Circuit:
The input point configuration allows you to define the top and bottom or the current scale (usually 4-20mA or 0-20mA) and the engineering units this corresponds to i.e. 0-100% or 0 - 400 DegC.
The following screen shot example shows the configuration for a 4-20mA input signal represented as 0-100%
