To scrape a real PLC in realtime and use that data to create NEW updating server

[MazoSergey]

Versions

• Python: 2.7
• OS: Linux
• Pymodbus: 1.3.2
• Modbus Hardware (if used): RSIM

Description

I am trying to make a clone of a real PLC with a help of Scraper example, and then use that data to create MODBUS server... If i understand correct I have to: scrape a real PLC --> save the data to file --> create server --> load data from file to server. It looks like I do not understand how this staff works :( If it is possible please help me, may be some examples of this kind of data flow. Thank you!

Code and Logs

 # code and logs here.

[dhoomakethu]

@MazoSergey what exactly is the problem ? Did you run the scraper example agains the PLC and encountered any error ?

[MazoSergey]

@dhoomakethu thank you for support! Yes, I tried to run example, I've got a file (dump of data from PLC). Now I am trying to run "Modbus Simulator Example" with -c option, and getting "Configuration Error: Invalid Configuration" :(

[dhoomakethu]

Could you upload the saved the configuration here please ?

[MazoSergey]

For sure! Here it is:
conf.txt

[rahulraghu94]

Hello @MazoSergey,

Could you please try this branch on your config file?
It contains a fix that worked. Please let us know :)

(modbus) [~/pymodbus/examples/contrib]$ python modbus-simulator.py -D -c ~/pymodbus/examples/contrib/conf.txt *[dev]
<class 'pymodbus.datastore.context.ModbusSlaveContext'>
INFO:pymodbus.server.async:Starting Modbus TCP Server on :5030
DEBUG:pymodbus.server.async:Starting in Main thread

[MazoSergey]

Hello @rahulraghu94,
Thank you very much guys for your support. I tried to use an updated modbus-simulator. Now it is started, but it seems that simulator does not take correct date from map dump. I've make a dump of PLC with 400001 = 111, 400002 = 222, but in simulator i see only zeros :(

[rahulraghu94]

Hello @MazoSergey , can you provide code excerpts, output and logs appended to the problem you're facing?

[MazoSergey]

Again thanks guys! Tomorrow i will be on the work and will provide all needed information...

[MazoSergey]

Hello and sorry for delay guys. So I am trying to use files from #250-fix-scraper-simulator brunch: pymodbus/examples/contrib/modbus-scraper.py -o data -s 172.27.248.33 against MOD_RSim Version 8.20. After that I am executing pymodbus/examples/contrib/modbus-simulator.py -c data -D and trying to connect with ModScan32. But as the result I did success to connect to the simulator but all data is "0". Can you explain please what else i should to provide for you? Thank you very much!
scraper_log.txt
server_log.txt
data.txt

[MazoSergey]

After I tried to scrape a real PLC I've got an error:

Unhandled error in Deferred

scraper_log (real_PLC).txt

[rahulraghu94]

@MazoSergey , thanks for the information! I'll have a closer look ASAP and get back to you :)

[rahulraghu94]

Hello @MazoSergey,

I'm using the config file you have uploaded here and am checking few of the values. They seem to be holding values. Are you using the message-parsers unser examples/contrib/message-parser.py to decode your message?

(modbus) [~/pymodbus/examples/contrib]$ ./message-parser.py -b -t -p tcp -m "0x0 0xc 0x0 0x0 0x0 0x13 0x1 0x3 0x10 0x0 0xa 0x0 0xa 0x0 0xa 0x0 0xa 0x0 0xa 0x0 0xa 0x0 0xa 0x0 0xa"                            *[#250-fix-scraper-simulator]
================================================================================
Decoding Message 000c00000013010310000a000a000a000a000a000a000a000a
================================================================================
ServerDecoder
--------------------------------------------------------------------------------
ClientDecoder
--------------------------------------------------------------------------------
name            = ReadHoldingRegistersResponse
protocol_id     = 0x0
unit_id         = 0x1
skip_encode     = 0x0
registers       =
                . [10, 10, 10, 10, 10, 10, 10, 10]
check           = 0x0
transaction_id  = 0xc
documentation   =
    This function code is used to read the contents of a contiguous block
    of holding registers in a remote device. The Request PDU specifies the
    starting register address and the number of registers. In the PDU
    Registers are addressed starting at zero. Therefore registers numbered
    1-16 are addressed as 0-15.