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Showing results for tags 'read_var'.

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how read data from modbus read_var function

saruans posted a topic in Modicon / Telemecanique / Schneider Electric

hello, Somebody have suggest how need read data from slave using modbus RTU. I am using M241 PLC and read_var function. The picture you can see my PLC program. The data of slave is placed 3394 address. Then I try to read, always "READ_VAR" function get "CommError" which number is 254 that means "The detected operation error contains protocol- specific code" and "OpenError" which number is 3 that means I don't know. How need read from slave data, which modbuss adress is 3394?
- 28 Apr 2022
- - modbus
  - m241
  - (and 2 more)
    Tagged with:
    
    modbus
    
    m241
    
    read_var
    
    somachine
How do I setup a Read_Var in SoMachine Basic ?

sarath wijesiri posted a topic in Download Comments

How do I setup a Read_Var in SoMachine Basic ?
Modbus comms between Schneider and allen Bradley

MbarrettAlpha posted a topic in Modicon / Telemecanique / Schneider Electric

Hi all, currently as part of a project I am trying to communicate between a Schneider M340 plc and an Allen Bradley micrologix processor. I am programming the M340 and the micrologix has been installed by another supplier. they have mapped the Modbus registers on their side and given me a spreadsheet with these. I am able to read values with no issue but I cannot write values back. i've included a screenshot or the read_var and write_var instructions I am using. I would really appreciate any help if anyone has any insight on this Mark
- 1 Aug 2017
- 4 replies
- - read_var
  - write_var
  - (and 3 more)
    Tagged with:
    
    read_var
    
    write_var
    
    schneider
    
    allen bradley
    
    modbus

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