Analog Input Configurations (NI 9351 Only)
- Updated2024-05-17
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Analog Input Configurations (NI 9351 Only)
Note Discrepancy fault and discrepancy warning are dependent on the measured current. For a discrepancy fault or warning to occur, the faulted channel must have a current delta with respect to the other channel(s) greater than the configured discrepancy current.
| Condition | Resulting Current Region | Diagnostic Fault |
|---|---|---|
| Short to ground | Low low | — |
| Current exceeds specifications | High high | Overcurrent fault |
| Open circuit | Low low | — |
| Incorrect sensor output | Current region depends on the current input from the faulted sensor. | — |
| Condition | Resulting Current Region | Diagnostic Fault(s) |
|---|---|---|
| Short to ground (one channel) | Low low | Discrepancy fault |
| Short to ground (both channels) | Low low | — |
| Current exceeds specifications (one channel) | High high unless the other channel is low low. | Overcurrent fault and discrepancy fault |
| Current exceeds specifications (both channels) | High high | Overcurrent fault |
| Open circuit (one channel) | Low low | Discrepancy fault |
| Open circuit (both channels) | Low low | — |
| Incorrect sensor output (one channel or both channels) | Current region depends on module FPGA voting outcome. | Discrepancy fault |
| Condition | Resulting Current Region | Diagnostic Fault(s) |
|---|---|---|
| Short to ground (one channel) | Current region depends on module FPGA voting outcome. Module FPGA assigns low low current region to faulted channel. | Discrepancy warning |
| Short to ground (two channels) | Low low | Discrepancy warning |
| Short to ground (all channels) | Low low | — |
| Current exceeds specifications (one channel) | Current region depends on module FPGA voting outcome. Module FPGA assigns high high current region to faulted channel. | Discrepancy warning |
| Current exceeds specifications (two channels) | High high | Overcurrent fault and discrepancy warning |
| Current exceeds specifications (all channels) | High high | Overcurrent fault |
| Open circuit (one channel) | Current region depends on module FPGA voting outcome. Module FPGA assigns low low current region to faulted channel. | Discrepancy warning |
| Open circuit (two channels) | Low low | Discrepancy warning |
| Open circuit (all channels) | Low low | — |
| Incorrect sensor output (one channel) | Current region depends on module FPGA voting outcome. | Discrepancy warning |
| Incorrect sensor output (two channels or all channels) | Current region depends on module FPGA voting outcome. | Discrepancy fault or discrepancy warning |