Allen-Bradley · Compact 5000 I/O Analog Modules
This boolean tag indicates that the channel (xx) data is beneath the underrange threshold for this channel. For example, when operating in the 4-20 mA output range, the underrange threshold is <3.6 mA, and an output signal of 0 mA would set this tag to 1.
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Measure the output signal at channel (Chxx) terminals to verify it is within the expected operating range (e.g., >3.6 mA for 4-20 mA).
Check the output configuration and commanded value for channel (Chxx) in the Logix Designer application.