National Instruments sbRIO-9687, User Manual

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signal source. Refer to the following tables for information about selecting over-range
comparator input signal source.
Table 23. Over-Range Comparator Input Selection, Inputs 1 and 2
Circuit Input 1 Switch Contacts Input 2 Switch Contacts
O-Ra 0 I Phase Inv. 0 SW47 5, 6 UDC Inv. 0 SW47 1, 2
O-Ra 1 I Phase Inv. 1 SW45 5, 6 UDC Inv. 1 SW45 1, 2
O-Ra 2 I Phase Inv. 2 SW48 5, 6 UDC Inv. 2 SW48 1, 2
O-Ra 3 I Phase Inv. 3 SW49 5, 6 UDC Inv. 3 SW49 1, 2
O-Ra 4 I Phase Inv. 4 SW50 5, 6 UDC Inv. 4 SW50 1, 2
O-Ra 5 I Phase Inv. 5 SW46 5, 6 UDC Inv. 5 SW46 1, 2
O-Ra 6 I Phase Inv. 6 SW32 5, 6 UDC Inv. 6 SW32 1, 2
O-Ra 7 — — — — — —
Table 24. Over-Range Comparator Input Selection, Inputs 3 and 4
Circuit Input 3 Switch Contacts Input 4 Switch Contacts
O-Ra 0 ssAI0± SW47 7, 8 ssAI7± SW47 3, 4
O-Ra 1 ssAI1± SW45 7, 8 ssAI8± SW45 3, 4
O-Ra 2 ssAI2± SW48 7, 8 ssAI9± SW48 3, 4
O-Ra 3 ssAI3± SW49 7, 8 ssAI10± SW49 3, 4
O-Ra 4 ssAI4± SW50 7, 8 ssAI11± SW50 3, 4
O-Ra 5 ssAI5± SW46 7, 8 ssAI12± SW46 3, 4
O-Ra 6 ssAI6± SW32 7, 8 ssAI13± SW32 3, 4
O-Ra 7 ssAI14± SW10 3, 4 ssAI15± SW10 1, 2
Setting the Over-Range Threshold
Analog input signals are connected to the over-range comparators before the gain stage, so the
threshold should be set in accordance with the signal level at the sbRIO-9687 input, which is
the breakout connector or inverter connector. The over-range circuit has a gain of 0.5 that
should be considered when setting the threshold.
The over-range threshold can be set by using the GPIC analog outputs or by populating an
onboard resistive divider.
To use the GPIC analog output for the set point, configure AO for onboard use; see Analog
Output Configuration on page 27 for details. For each over-range comparator, set the
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