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    How to disable and enable the 1Wire bus (M503)

    Official EVOK API
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    • Vesa Kauppinen
      Vesa Kauppinen @TomasKnot last edited by

      Hi @tomasknot

      I'll come back to this topic again. Is it possible to do the same for Modbus in M503? I mean reset the bus (disable/enable)

      Br,
      Vesa

      Martin Kudláček 1 Reply Last reply Reply Quote 0
      • Martin Kudláček
        Martin Kudláček @Vesa Kauppinen last edited by

        Hello @vesa-kauppinen,
        yes, check our Modbus Registers Maps: https://kb.unipi.technology/files:products:02-neuron

        For M503 it is coil 1001 - Enable/Disable 1Wire Bus

        Best regards,
        Martin

        Vesa Kauppinen 1 Reply Last reply Reply Quote 0
        • Vesa Kauppinen
          Vesa Kauppinen @Martin Kudláček last edited by Vesa Kauppinen

          @martin-kudláček

          Hi,

          That's what we've done with 1-Wire and it works.

          I mean, is it possible to do this same 'reset' for Modbus (RTU) itself? We sometimes lose a modbus device.

          Br,
          Vesa

          Martin Kudláček 1 Reply Last reply Reply Quote 0
          • Martin Kudláček
            Martin Kudláček @Vesa Kauppinen last edited by Martin Kudláček

            Oh, sorry for the misunderstanding @vesa-kauppinen.

            We have a functionality called Master Watch Dog (MWD). When enabled, the underlying HW will watch when the last communication happend. If it will be longer than the preset time, it will reboot itself. Now, this can be set per group in the PLC, and it will watch if the ModbusTCP server communicates with the given group. If not, the board will reboot. Similarly, this can be set on the extensions as well. If nothing communicates with the extension over ModbusRTU, the extension reboots itself.

            This can be set via modbus. Look for the "Enable MWD" coil and "MWD timeout" register. The timeout is in miliseconds.

            Best regards,
            Martin

            Vesa Kauppinen 1 Reply Last reply Reply Quote 0
            • Vesa Kauppinen
              Vesa Kauppinen @Martin Kudláček last edited by

              @martin-kudláček

              Thank you!

              Can you give a noob example of how to set 'MWD Enable' to 1 with pollmb.py?

              Br,
              Vesa

              Martin Kudláček 1 Reply Last reply Reply Quote 0
              • Martin Kudláček
                Martin Kudláček @Vesa Kauppinen last edited by

                @vesa-kauppinen

                Sorry, I've never used the pollmb.py. Would be the mbpoll example sufficient? You can install the mbpoll from our repository: apt update && apt install mbpoll

                Martin

                Vesa Kauppinen 1 Reply Last reply Reply Quote 0
                • Vesa Kauppinen
                  Vesa Kauppinen @Martin Kudláček last edited by

                  @martin-kudláček

                  Yes. If you can give mbpoll example that would be great!

                  :)

                  Br,
                  Vesa

                  Martin Kudláček 1 Reply Last reply Reply Quote 0
                  • Martin Kudláček
                    Martin Kudláček @Vesa Kauppinen last edited by

                    @vesa-kauppinen

                    For Group 1 on M503

                    Verify the status of the MWD (if 0 - MWD disable, if 1 - MWD enabled but never rebooted, if 2 - MWD enabled and already rebooted):
                    mbpoll -m tcp -a 0 127.0.0.1 -0 -1 -r 6

                    Set the MWD timeout to 5000ms:
                    mbpoll -m tcp -a 0 127.0.0.1 -0 -r 1008 5000

                    Enable the MWD:
                    mbpoll -m tcp -a 0 127.0.0.1 -0 -r 6 1

                    Write the settings to the NVRAM:
                    mbpoll -m tcp -a 0 127.0.0.1 -0 -t 0 -r 1003 1

                    Verify the MWD by stopping the UniPi Modbus TCP server:
                    sudo systemctl stop unipitcp

                    The both lines of LEDs should blink for 1sec after the MWD timeout

                    Disable the MWD:
                    mbpoll -m tcp -a 0 127.0.0.1 -0 -r 6 0

                    Write the settings to the NVRAM:
                    mbpoll -m tcp -a 0 127.0.0.1 -0 -t 0 -r 1003 1

                    For Group 2 on M503
                    Use the MWD control register 114 instead of 6
                    Use the MWD timeout register 1108 instead of 1008
                    Use the Save configuration coil 1103 instead of 1003

                    Vesa Kauppinen 1 Reply Last reply Reply Quote 0
                    • Vesa Kauppinen
                      Vesa Kauppinen @Martin Kudláček last edited by

                      @martin-kudláček

                      Thanks for the good instructions! After enabling MWD, setting timeout and writing the settings:

                      mbpoll -m tcp -a 0 127.0.0.1 -0 -1 -r 6
                      mbpoll 1.2-6 - FieldTalk(tm) Modbus(R) Master Simulator
                      Copyright (c) 2015 epsilonRT, All rights reserved.
                      This software is governed by the CeCILL license <http://www.cecill.info>
                      
                      Protocol configuration: Modbus TCP
                      Slave configuration...: address = [0]
                                              start reference = 6, count = 1
                      Communication.........: 127.0.0.1, port 502, t/o 1.00 s, poll rate 1000 ms
                      Data type.............: 16-bit register, output (holding) register table
                      
                      -- Polling slave 0...
                      [6]:    3
                      

                      ...or...

                      mbpoll -m tcp -a 0 127.0.0.1 -0 -1 -r 114
                      mbpoll 1.2-6 - FieldTalk(tm) Modbus(R) Master Simulator
                      Copyright (c) 2015 epsilonRT, All rights reserved.
                      This software is governed by the CeCILL license <http://www.cecill.info>
                      
                      Protocol configuration: Modbus TCP
                      Slave configuration...: address = [0]
                                              start reference = 114, count = 1
                      Communication.........: 127.0.0.1, port 502, t/o 1.00 s, poll rate 1000 ms
                      Data type.............: 16-bit register, output (holding) register table
                      
                      -- Polling slave 0...
                      [114]:  3
                      

                      What does that result (3) mean? Its not 0, 1 or 2.

                      Btw

                      sudo systemctl stop unipitcp
                      

                      should be

                      sudo systemctl stop neurontcp
                      

                      in Neuron M503...right??

                      Br,
                      Vesa

                      Martin Kudláček 1 Reply Last reply Reply Quote 0
                      • Martin Kudláček
                        Martin Kudláček @Vesa Kauppinen last edited by Martin Kudláček

                        Hi @vesa-kauppinen,
                        sorry the value 3 is 1 + 2, which means board has MWD enabled and the MWD already rebooted the board.

                        The service is called unipitcp, but in older packages it was called neurontcp. The service is the same for Neurons and Axons, so we renamed it to unipitcp to make it more clear.

                        Best regards,
                        Martin

                        Vesa Kauppinen 1 Reply Last reply Reply Quote 0
                        • Vesa Kauppinen
                          Vesa Kauppinen @Martin Kudláček last edited by Vesa Kauppinen

                          @martin-kudláček

                          Aaaaa...of course :D

                          But what about this: either 11 or 3

                          root@residevice:~# mbpoll -m tcp -a 0 127.0.0.1 -0 -1 -r 6
                          mbpoll 1.2-6 - FieldTalk(tm) Modbus(R) Master Simulator
                          Copyright (c) 2015 epsilonRT, All rights reserved.
                          This software is governed by the CeCILL license <http://www.cecill.info>
                          
                          Protocol configuration: Modbus TCP
                          Slave configuration...: address = [0]
                                                  start reference = 6, count = 1
                          Communication.........: 127.0.0.1, port 502, t/o 1.00 s, poll rate 1000 ms
                          Data type.............: 16-bit register, output (holding) register table
                          
                          -- Polling slave 0...
                          [6]:    11
                          
                          root@residevice:~# mbpoll -m tcp -a 0 127.0.0.1 -0 -1 -r 6
                          mbpoll 1.2-6 - FieldTalk(tm) Modbus(R) Master Simulator
                          Copyright (c) 2015 epsilonRT, All rights reserved.
                          This software is governed by the CeCILL license <http://www.cecill.info>
                          
                          Protocol configuration: Modbus TCP
                          Slave configuration...: address = [0]
                                                  start reference = 6, count = 1
                          Communication.........: 127.0.0.1, port 502, t/o 1.00 s, poll rate 1000 ms
                          Data type.............: 16-bit register, output (holding) register table
                          
                          -- Polling slave 0...
                          [6]:    3
                          
                          root@residevice:~# mbpoll -m tcp -a 0 127.0.0.1 -0 -1 -r 6
                          mbpoll 1.2-6 - FieldTalk(tm) Modbus(R) Master Simulator
                          Copyright (c) 2015 epsilonRT, All rights reserved.
                          This software is governed by the CeCILL license <http://www.cecill.info>
                          
                          Protocol configuration: Modbus TCP
                          Slave configuration...: address = [0]
                                                  start reference = 6, count = 1
                          Communication.........: 127.0.0.1, port 502, t/o 1.00 s, poll rate 1000 ms
                          Data type.............: 16-bit register, output (holding) register table
                          
                          -- Polling slave 0...
                          [6]:    11
                          

                          Br,
                          Vesa

                          Martin Kudláček 1 Reply Last reply Reply Quote 0
                          • Martin Kudláček
                            Martin Kudláček @Vesa Kauppinen last edited by

                            @vesa-kauppinen

                            Ok, this is a little bit tricky. The register has 16bits, and some of the bits represent some state or function.

                            Bit 0: Set or read the status of the MWD
                            Bit 1: The MWD rebooted the boarde
                            other bits contain some debug information, which we haven't documented yet

                            So value 11 in decimal is 0000 0000 0000 1011 in binary. The bit no. 0 (first from the right) is 1, which means MWD is enabled. The bit no. 1 (second from the right) is 1, which means MWD already rebooted the board. Other bits don't apply to you.

                            You can "mask" the lowest 2 bits with boolean operation AND, typically with bit mask in hexadecimal representation:

                            register_6 && 0x0003

                            Or with binary mask:

                            register_6 && 0b11

                            I hope this helps you.
                            Martin

                            Vesa Kauppinen 2 Replies Last reply Reply Quote 0
                            • Vesa Kauppinen
                              Vesa Kauppinen @Martin Kudláček last edited by

                              @martin-kudláček

                              Okay. This clarified the case :)

                              Thank you!

                              Br,
                              Vesa

                              1 Reply Last reply Reply Quote 0
                              • Vesa Kauppinen
                                Vesa Kauppinen @Martin Kudláček last edited by Vesa Kauppinen

                                @martin-kudláček

                                Hi...again

                                One more stupid question: How do I reset 1-wire bus with mbpoll?

                                I mean, how can i "convert" those commands:

                                ./pollmb.py -p 502 -u 1 -f 5 -a 1001 -q 1 -d 1
                                ./pollmb.py -p 502 -u 1 -f 5 -a 1001 -q 1 -d 0
                                

                                to mbpoll "format". I just don't understand how to read/write coils with mbpoll.

                                Thank you!
                                Vesa

                                Martin Kudláček 1 Reply Last reply Reply Quote 0
                                • Martin Kudláček
                                  Martin Kudláček @Vesa Kauppinen last edited by

                                  Hi @vesa-kauppinen,
                                  writing 1 to coil 1001:

                                  mbpoll -m tcp -a 0 127.0.0.1 -t 0 -0 -r 1001 1

                                  Writing 0:

                                  mbpoll -m tcp -a 0 127.0.0.1 -t 0 -0 -r 1001 0

                                  You can learn more from the quite detailed help of the mbpoll:

                                  mbpoll -h

                                  Regards,
                                  Martin

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