Rockwell Automation Publication 1732E-UM001A-EN-P - December 2019 37
Diagnostic Properties Chapter 4
The error message is filtered by means of a fixed filter period of 300 ms.
Error in System/Sensor
Power Supply
The voltage value for the system/sensor power supply is also monitored globally.
If the value goes outside the voltage range of 18…30V, an error message is created.
The U
S
indicator lights up red and the sensor undervoltage bit is set in the
module information byte.
The error message has no effect on the outputs and is not filtered, but is reported
immediately.
ATTENTION: Every output channel that is active at the same time as the error
occurs in supply voltage U
L
is locked. This means that for correct operation, the
output channel must be reset by the controller when the status of the supply
voltage U
L
has normalized again.
We recommend to deactivate all output channels with the controller as soon as the
undervoltage is detected. Otherwise, because the channels are locked, every active
output channel will report a diagnostic when the voltage value has normalized
again.
WARNING: The supply voltage measured at the device furthest away from the
system/sensor power supply must not drop below 18V DC.
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