Difference between revisions of "626"
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This can be caused by slow slew rates on the encoder signals. Examine the encoder clock signals with an oscilloscope. If you don't see sharp, fast rise and fall times, you may need to add external termination or pull-up resistance to the clock lines to speed up the edges. | This can be caused by slow slew rates on the encoder signals. Examine the encoder clock signals with an oscilloscope. If you don't see sharp, fast rise and fall times, you may need to add external termination or pull-up resistance to the clock lines to speed up the edges. | ||
| + | |||
| + | ==Migrating to PCI Express== | ||
| + | |||
| + | When upgrading your system to PCIe, we recommend [[826|Model 826]] as a replacement for model 626. The following table compares the interfaces on the two boards: | ||
| + | |||
| + | {| class="wikitable" | ||
| + | ! Interface | ||
| + | ! 626 | ||
| + | ! 826 | ||
| + | |- | ||
| + | | Counters | ||
| + | | 6: 24-bit w/latch | ||
| + | | 6: 32-bit w/16-deep FIFO and timestamps | ||
| + | |- | ||
| + | | GPIOs | ||
| + | | 48: 1 Msps w/edge detection | ||
| + | | 48: 50 Msps w/edge detection, debounce & fail-safe outputs | ||
| + | |- | ||
| + | | Analog out | ||
| + | | 4: 14-bit @ 20 Ksps | ||
| + | | 8: 16-bit @ 900 Ksps w/fail-safe outputs | ||
| + | |- | ||
| + | | Analog in | ||
| + | | 16: 16-bit @ 15 Ksps | ||
| + | | 16: 16-bit @ 300 Ksps | ||
| + | |- | ||
| + | | Watchdog timer | ||
| + | | Single w/4 selectable intervals | ||
| + | | 3-stage w/programmable intervals | ||
| + | |- | ||
| + | | Fail-safe controller | ||
| + | | None | ||
| + | | Integrated | ||
| + | |} | ||
Revision as of 11:00, 13 April 2017
Contents |
64-bit Windows
- I successfully built a 626 program for my 64-bit Windows 7 system but it crashes when it executes. What could be the problem?
The 626 works with 64-bit Windows, but only with 32-bit applications. When building your application, make sure the CPU target is selected as 32-bit or Win32.
Encoder errors
- The encoder interface misses some encoder clocks, especially at higher rotation speeds.
This can be caused by slow slew rates on the encoder signals. Examine the encoder clock signals with an oscilloscope. If you don't see sharp, fast rise and fall times, you may need to add external termination or pull-up resistance to the clock lines to speed up the edges.
Migrating to PCI Express
When upgrading your system to PCIe, we recommend Model 826 as a replacement for model 626. The following table compares the interfaces on the two boards:
| Interface | 626 | 826 |
|---|---|---|
| Counters | 6: 24-bit w/latch | 6: 32-bit w/16-deep FIFO and timestamps |
| GPIOs | 48: 1 Msps w/edge detection | 48: 50 Msps w/edge detection, debounce & fail-safe outputs |
| Analog out | 4: 14-bit @ 20 Ksps | 8: 16-bit @ 900 Ksps w/fail-safe outputs |
| Analog in | 16: 16-bit @ 15 Ksps | 16: 16-bit @ 300 Ksps |
| Watchdog timer | Single w/4 selectable intervals | 3-stage w/programmable intervals |
| Fail-safe controller | None | Integrated |