Solution
PXI and PXI Express modules are not universally interchangeable. Compatibility depends on the module type and the slot type available in the chassis. While some PXIe chassis support multiple module types through hybrid slots, traditional PXI chassis do not support PXIe modules.
The table below summarizes module‑to‑slot compatibility:
| Module Type | Full PXI Slot | PXIe Hybrid Slot | PXIe Slot | PXIe System Timing Slot |
|---|
| Full PXI Module | YES | NO | NO | NO |
| PXI Hybrid-Compatible Module | YES | YES | NO | NO |
| PXIe Module | NO | YES | YES | YES |
| PXIe Timing Module | NO | NO | NO | YES |
| 32-bit cPCI Module | YES | YES | NO | NO |
| 64-bit cPCI Module | NO | NO | NO | NO |
Note: Although 64-bit cPCI modules are mechanically compatible with full PXI slots, they are not electrically compatible. Using these modules in such slots may cause unexpected issues and potential hardware damage.
Understanding PXIe Hybrid Slots
PXIe Hybrid Peripheral slots contain a combination of backplane connectors that allow them to accept PXIe modules, 32-bit cPCI modules, and PXI hybrid‑compatible (PXIe‑ready) modules. These slots provide the widest compatibility and are commonly used in mixed PXI/PXIe systems.
The following figure illustrates the three types of PXI backplane connectors that will fit in a PXIe Hybrid slot, as well as an illustration of the PXI standard connector that is incompatible with PXI Express Hybrid slots:
How to Verify Compatibility
To confirm compatibility for a specific module and chassis combination:
• Compare the slot symbols on the chassis with the connector type on the module.
• Review the chassis specifications to identify available slot types.
• Use the NI Product Advisor to validate configurations and identify incompatible modules before installation.
Note: End‑of‑Life (EOL) hardware does not appear in the PXI Product Advisor. If you are working with EOL modules or chassis, rely on product documentation and slot type specifications instead.