MrPLC Member
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About Mark-

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  1. Hello, A port of our free MODBUS RTU serial slave has been posted to Github if anyone is interested.  
  2. MODBUS Newbie!

    Correct. The master controls all the data flow on the loop. If a slave could initiate communications on the loop collisions would occur. MODBUS is a very simple master/slave protocol.
  3. Where can i find driver for master k120s? (LG)

    Hello, PeakHMI has a Master K driver.  
  4. ControlLogix String Access via EIP/CIP

    Hello, IIRC, to write a string the data format is parameter count, structure code, element count, length count and then characters (as bytes). You write to the tag name. Download the PeakHMI demo installer and install it. Create an AB Logix port, create one string, execute a point test and capture the request/response in Wireshark.  That will give you the read exchange. For a write, create a screen with a button, add the write command, start runtime, activate the button and view the Wireshark capture. Contact support if you need any help.
  5. CIP: Forward close fault

    Hello, Download the demo for PeakHMI and use it to capture packets in Wireshark. If you need any help contact PeakHMI support.  
  6. Stripped down HMI Software

    Hello,   PeakHMI  
  7. MNET to OMNI

    Omni has some registers that are regular MODBUS and other registers that are Enron MODBUS. Omni produces the "MODBUS database addresses and index numbers" user manual for the flow computer/firmware revisions. For example: Depending on the register index, requesting 1 register could get you 1, 2, 4 or 8 words (1 word = 16 bits).
  8. Hello,   Does anyone know the supported attribute values and definitions for the CIP Get_Instance_Attribute_List (0x55) service?   Attribute 1 and 2 are defined in a public AB documents and 8 appears to be array dimensions. 7 could be data size in bytes, a total guess.    
  9. Field Service

    It might help to state the manufacture/brand, model, version, etc.  
  10. Hello, PeakHMI could be a solution.    
  11. Hello, To me, no. But, you have not defined who is using the device, the purpose of the communication, the level of security required, the design goals, etc..  
  12. Hello, >Do I have to execute a read before I write Depends. Function code 23 executes a read and a write with one command but, most devices do not support it. >PLC write commands usually set up to do that for you? No. Normally you want to write a value to the register regardless of the current register value My2c  

    They offer three different license types; a student license was not among the three. I would contact them or the local rep for assistance in getting a license.

    Thier website does not list a demo/evaluation version. It looks like they have a rep "Petrogas Systems Tunisie" in Tunisia
  15. Hello, There is the Mitsubishi Q TCP protocol. SH(NA)-080008