When I look at the /var/log/kern.log, i am seeing a flood of messages "piControl i/o: missed xx cycles". Why is this error? How can we stop this error?
https://revolutionpi.de/forum/viewtopic.php?f=6&t=2998#p10787
I want to connect RS485 to PLC by I/O RS485 at Pin P and N (not USB) , What I have to do?
Have a look at our tutorial
https://revolution.kunbus.com/tutorials/serielle-geraete-anschliessen-compact/
There are two different supply voltages - device and IO channels. Is there a sequence to be observed?
No, the sequence does not matter. 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
I want to set a GPIO pin high and I don't use piControl. Why does the pin always go low?
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.
There is an undocumented interface on the RevPi Compact, can this be?
The HDMI interface is present but is not considered a warranted capability, therefore we do not warrant or support the HDMI interface.
Can the RevPi Compact be expanded, e.g. with I/O modules?
No, the RevPi Compact is not expandable.
Can the RevPi Compact handle measurements of negative Voltages?
No, the range is 0 - 10 V.
8 x analog Inputs |
2 x analog Outputs |
https://revolution.kunbus.com/revpi-compact/