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Cooper Bussmann BU-905U-L Wireless I/O Installation Manual
Analog Output
The BU-905U-L-R module provides a 4 - 20mA DC analog output for connecting to instrument indicators to display remote analog measurements.
The analog output is a current source provided from an internally generated +24V loop supply.
When connecting to an external device (e.g. electronic indicator, recorder, PLC / DCS input, etc.) by connecting the output between the Analog
Output terminal (+) and the COM terminal (-).
Note: Zener protection of analog outputs provides protection against short periods of over-voltage; however longer periods may result
in module damage.
You can also individually configure analog outputs to turn off (i.e., 0mA) if no command message is received to the output for a certain period.
The following diagrams illustrate different connection methods:
Connection Method Example
Loop powered device
Floating input device
To single-ended input device
3A1580Rev1.6