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Analog inputs on a MicroSmart controller are all reading a negative value.

Issue

Analog inputs on a MicroSmart controller are all reading a negative value.

Environment

MicroSmart controllers (all versions)

Cause

Hardware issue or sensor failure

Resolution

If the connected sensor is a RTD, a negative reading reflects an electrical short somewhere between the controller and the sensor.  Note that a high positive reading reflects an electrical open circuit.

If the connected sensor is a 4-20 mA device, it typically reads a high positive value which reflects an electrical open circuit.

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Version history
Revision #:
1 of 1
Last update:
‎2018-09-06 09:50 AM
Updated by: