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We noticed that when we power up the Revolution Pi Compact, all 8 DIGITAL OUT pins switch to HI for a brief period, perhaps 5-10ms. This happens during every boot. What can I do?
Yes, this is unfortunately a known issue. We are currently working on this bug. Unfortunately, we can't influence the behaviour. The output pins on the Compact come directly from the compute module, and we have no influence on this behaviour at boot time.
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Would it be possible to switch off the watchdog timer for the digital outputs of the RevPi Compact Module?
Unfortunately, it is impossible to deactivate the watchdog without hardware modifications.
The digital outputs of the RevPi Compact Module cause a peak when switching on, what can I do?
What was the solution?
There is a workaround that fixes this behaviour on reboot, see here:
What is the XXX chip used to multiplex analogue to digital conversions (item 2)?
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The multiplexer: DG408LE
the selection of the analog input is done via GPIO6, GPIO12 and GPIO13
GPIO | DG408LE |
|---|---|
GPIO6 | A0 |
GPIO12 | A1 |
GPIO13 | A2 |
How can I access the Digital Inputs / Outputs from Codesys?
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https://revolutionpi.com/tutorials/ein-ausgaenge-steuern-mit-picontrol-compact/
https://revolutionpi.com/tutorials/ein-ausgaenge-steuern-ohne-picontrol-compact/
I want to read out an analog PNP sensor with Python
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– how can I do that?
Have a look at this tutorial:
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https://revolution.kunbus.com/tutorials/serielle-geraete-anschliessen-compact/
There are two different supply voltages
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– device and IO channels. Is there a sequence to be observed?
No, the sequence does is not matterrelevant. However, external devices should only be connected in a de-energized state and checked for correct wiring before commissioning to avoid destruction.
Digital Inputs and Outputs (Compact) - Industrial Raspberry Pi
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The digital outputs are equipped with a watchdog. A watchdog is a component that monitors the functioning of other components in a system. In this case, the digital outputs must be rewritten at least every 9 milliseconds. If this does not happen, the watchdog sets the digital outputs to “low” to establish a safe state! As the system might have crashed.
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The HDMI interface is present but is not considered a warranted capability, ; therefore we do not warrant or support the HDMI interface.
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No, the range is 0 - 10 V.
8 x analog Inputs |
2 x analog Outputs |
https://revolution.kunbus.com/revpi-compact/
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