If a point on a SNAP-AIRTD or SNAP-AITM type module has been configured as an RTD or thermocouple Point Type, respectively, subsequent point reconfigurations of the same point may produce invalid readings.
For example, if a thermocouple point on a SNAP-AITM was once configured as a Type K (0x08) thermocouple Point Type, and is later configured as a +/- 150 mV (0x42) Point Type, the readings as a millivolt input point are not within the expected range.
Likewise, if a SNAP-AIRTD is first configured as a RTD Point Type 100 ohm NI RTD (0x2E) and is later reconfigured as a Generic Input (0x01) Point Type, the readings will not be within range.
The problem can be corrected on the SNAP-AITM type module if the new Point Type is another thermocouple, the brain is reset, or the point configurations are cleared, such as with ioManager’s Status Write→Reset points to defaults command.
For SNAP-AIRTD modules, the problem may be corrected if the brain is reset, or the point configurations are cleared with ioManager’s Tools→Status Write→Reset points to defaults command.
Opto 22 has resolved this issue.
Bug may be seen when using the following modules: