IO Pi Plus and Codesys
The IO Pi Plus is a 32 channel MCP23017 GPIO expander for the Raspberry Pi
17/09/2020
Posted by:
burger
Hello everyone!
II am using IO Pi Plus with my Rasypberry and have some problems. I am using it as digital outputs, but there is always 5V on piout even if I change the state.
I am using this library for Codesys
regards
II am using IO Pi Plus with my Rasypberry and have some problems. I am using it as digital outputs, but there is always 5V on piout even if I change the state.
I am using this library for Codesys
regards
17/09/2020
Posted by:
andrew
Hello
I don't have any experience developing with Codesys so I can't help you with their MCP23017 library.
Can you try testing the IO Pi Plus with our Python library and see if it works correctly? There is a demo file called demo_iowrite.py in the ABElectronics_Python_Libraries/IOPi/demos/ folder that should write to the digital outputs on the IO Pi Plus.
If the demo files work you can narrow the problem down to the Codesys library, in which case you may find more help on the Codesys forums.
I don't have any experience developing with Codesys so I can't help you with their MCP23017 library.
Can you try testing the IO Pi Plus with our Python library and see if it works correctly? There is a demo file called demo_iowrite.py in the ABElectronics_Python_Libraries/IOPi/demos/ folder that should write to the digital outputs on the IO Pi Plus.
If the demo files work you can narrow the problem down to the Codesys library, in which case you may find more help on the Codesys forums.
17/09/2020
Posted by:
burger
Thank you.
20/09/2020
Posted by:
burger
Hello everyone!
I was testing this and I do not think this is a library problem.
If I startup my RPI and IO board at the same time I can not operate with outputs. There is 5V on every pin on this board. But If I startup Raspberry PI first and this IO board in about 10s, I can operate with outputs normal.
Best regards
I was testing this and I do not think this is a library problem.
If I startup my RPI and IO board at the same time I can not operate with outputs. There is 5V on every pin on this board. But If I startup Raspberry PI first and this IO board in about 10s, I can operate with outputs normal.
Best regards
20/09/2020
Posted by:
andrew
Is the IO Pi powered from the same power supply as the Raspberry Pi or are you using separate supplies?
If you are using two power supplies, when they are switched on the IO Pi supply may reach 5V before the Raspberry Pi supply which could be causing this issue. To get around this issue you may need to find a way of starting the Raspberry Pi power supply before the IO Pi supply so the Raspberry Pi is already initialised when the IO Pi powers up.
If you are using two power supplies, when they are switched on the IO Pi supply may reach 5V before the Raspberry Pi supply which could be causing this issue. To get around this issue you may need to find a way of starting the Raspberry Pi power supply before the IO Pi supply so the Raspberry Pi is already initialised when the IO Pi powers up.
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