The Industrial Raspberry Pi Forum • Cannot read from Profinet Gateway

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Cannot read from Profinet Gateway

Posted: 02 Dec 2020, 15:08

by novako19

Hi!

I am trying to read a data from Profinet IRT Gateway from Python by revpimodio2 on my RevPi Connect.

When I log into the Gateway's web interface, I can see the data under in the Output section. Nevertheless, in Linux, I can't read any of them by using revpimodio2 (nor I can read it by using piTest), I only see zeros.

---

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piTest -d

gives

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Found 2 devices:

Address: 0 module type: 105 (0x69) RevPi Connect V1.0
Module is present
     input offset: 1024 length: 6
    output offset: 1030 length: 5

Address: 31 module type: 79 (0x4f) Gateway Profinet IRT V1.2
Module is present
     input offset: 0 length: 512
    output offset: 512 length: 512

.

When I tried to update firmware by

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piTest -f

, it did nothing, but

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[ 3720.932713] piControl: error: cannot open file /lib/firmware/revpi/fw_00105_001.fwu
[ 3720.932722] piControl: update 0 addr 0 ret -2
[ 3720.932749] piControl: error: cannot open file /lib/firmware/revpi/fw_00079_001.fwu
[ 3720.932755] piControl: update 1 addr 31 ret -2

appeared in

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kern.log

.

I'm running

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Linux RevPi1002748982 4.19.95-rt38-v7+ #1 SMP PREEMPT RT Tue, 16 Jun 2020 13:25:43 +0200 armv7l GNU/Linux

,

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Raspbian GNU/Linux 9 \n \l \4 \6

, fully updated by

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apt dist-upgrade

.

Does anybody has an idea, how should I proceed next to solve this problem?

Thanks!

Re: Cannot read from Profinet Gateway

Posted: 03 Dec 2020, 15:16

by dirk

Hi, the I/O mapping of the data can be a bit cumbersome regarding the Modular Gateway Profinet IRT. There are different offsets for acyclic and cyclic data exchanges.
Have a look at the user manual regarding the offsets:

: 5.3 Exchanging Data cyclically; 2020-12-03 15_17_34-Gateway Component for PROFINET.jpg (48.13 KiB) Viewed 4919 times

: 5.4 Exchanging Data acyclically (Records); 2020-12-03 15_19_20-Gateway Component for PROFINET.jpg (49.01 KiB) Viewed 4917 times

Check the Profinet module configuration on the PLC.
By default in PiCtory you just have access to the first 20 bytes of input and output data.
Have a look at this post how you can switch the configuration to get access to the full data range of 512 bytes for input and output data.

Re: Cannot read from Profinet Gateway

Posted: 10 Dec 2020, 17:38

by novako19

Thanks for the answer. I have tried to view the data by

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piTest -r 0,1000

to be sure I haven't confused the offset, but with no success. All displayed values were zero.

Re: Cannot read from Profinet Gateway

Posted: 11 Dec 2020, 15:32

by dirk

Hi novako19, thank you for your reply and your investivations about the fwu files. There are fwu files missing also for the gateway module PROFINET you are using. We have to verify the root cause of this and hope that we can send you the necesary file as soon as possible. Thank you for your patience.

Re: Cannot read from Profinet Gateway

Posted: 15 Jan 2021, 16:08

by dirk

Hi novako19, the Debian package revpi-firmware in version 1.5 is released in our repository. The missing files have been added. Please update your system like so:

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sudo apt update
sudo apt install revpi-firmware

Then it should be possible to update the devices.

Re: Cannot read from Profinet Gateway

Posted: 20 Jan 2021, 11:41

by novako19

Hi, thanks for the update, but the problem was not solved.

With

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revpi-firmware

updated to version 1.5

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piTest -f

now prints

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update firmware fail

and logs

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[  271.922756] piControl: stop data exchange
[  271.922791] piControl: piIoComm_gotoGateProtocol returned 0
[  271.994058] piControl: error: cannot open file /lib/firmware/revpi/fw_00105_001.fwu
[  271.994070] piControl: update 0 addr 0 ret -2
[  271.995217] piControl: firmware file length: 121552
[  272.000362] piControl: firmware is up to date: 1.2 >= 1.2
[  272.000379] piControl: update firmware fail
[  272.000387] piControl: update 1 addr 31 ret

The device behaves the same way as before the update. That is - writting from PLC to Profinet Gateway works (I can see the value on the Gateway's website), but

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piTest -r 0,1024,h

only prints zeroes. Could it be a HW problem? How can I diagnose it?

Re: Cannot read from Profinet Gateway

Posted: 12 Feb 2021, 11:22

by novako19

Any update on this, please?