brewer

MrPLC Member
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About brewer

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  • Birthday 02/03/68

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  • Gender Male
  • Location Fredericton, New Brunswick
  • Country Canada
  1. Modbus TCP Enable

    I have an application with a ML1100 Controller which I a trying to communicate to a Kohler Generator.  The generator Talks Modbus TCP and there is a Prosoft Gateway PLC32-EIP-MBTCP.  This gateway will convert my information to Ethernet I/P but it will be in a 4x register format.  Is there a way in the ML1100 to enable Modbus TCP like the ML1400?  or can I read this with a MSG instruction.  Thanks
  2. I am looking for a solution to connect a PC to a modbus plus network for my HMI.  The old option was to use an SA85 card but is there something better.  Ideally ethernet I/P to Modbus Plus Converter if there is such a thing.  Does anyone have a recommendation that they have used.  
  3. Compact Logix Ladder

    Thanks  I ended up doing a similar network in Ladder to get what I needed.  I agree that they should have kept the SCP in ladder.
  4. Compact Logix Ladder

    Is there a simple instruction where I can fill in a table and do a look-up based on a value.  I have a airflow meter that Pressure correlates to Airflow but it is non linear.  I have 11 pressures that equal 11 flows. Using RSLogix 5000 V20.04 Ladder logic only, no language pack. Thanks  
  5. Compact Logix

    Thanks, I have decided to use a 1769-L32E at the remote site which has a built in Serial port.
  6. Compact Logix

    Unfortunately we have to stick to the serial radio's for now.  The plan is to go to Ethernet radios in the future but it is not in the budget for this year.  There are 10 remote sites. 
  7. Compact Logix

    I do not have Ethernet between the two plc's. They are miles apart and we utilize serial liscense frequency radios to communicate. 
  8. Compact Logix

    I have a control system based on Micrologix 1100's  (one master and multiple slaves) I would like to add a new PLC to the network.  Can I use a 1769-L32E or similar in the field and connect its RS-232 port to a serial radio (this would be a network slave).  I want to use the Micrologix 1100  with a message instruction to read the PLC.   The reason I want to do  this is to migrate the system to a new platform in the future or  should I just add another ML100 to the network and continue on the same path. Thanks  
  9. I am not sure what you are trying to achieve for control.  The PID function would be used if you had some other condition controlling the speed of the conveyor.  For example if the motor current increases because the conveyor is becoming overloaded you could speed up the belt to lessen the amount of material going to the conveyor or maybe some other factor control the speed of the conveyor.  Otherwise if you are just trying to set a speed you could do as Azdi Mus Suggested.
  10. I am having issues with a unity processor.  I have converted the Proworks32 program to unity and for the most part the system is running fine.  My processor is in the electrical room and the I/o is distributed throughout the plant on I/O bus.  Every so often some outputs drop out stopping my conveyors. The start button is pushed and the system start right back up.  Is there any diagnostic information I can get from Unity to help resolve this issue?
  11. I am programming a Modicon M340 for the First time, I have found a really good u-tube video on setting up and configuring. Is anyone aware of a tutorial on function block programming? I am use to the AB function block programming but I am unfamilliar with the instruction set in the M340. Thanks
  12. Modbus Ascii

    After talking with tech support I have decided to bite the bullet and purchase a momentum Plc so I can use the xmit block. It ends up being about $1000 but I have done this in the past. The communication is 300 baud 8 even 1 slow but very reliable. I am only reading 16 registers from 3 sites and need to write 16 registers to one site. Thanks for all the comments.
  13. Modbus Ascii

    The read is not the issue it is the write. I think i have to calculate the checksum and put it into the message before I write it.
  14. I am looking for some assistance using a write block of an ASCII message with 984-485E I am presently reading the site and having no issues with the read. The issue i am having is the write. My ascii message is set up as follows : 03 10 04 7E 00 10 5B (crlf) : - start of message 03 - remote plc address 10 - write preset multiple (16 dec) 04 7E - 1150 write block starting at 401151 00 10 - Quantity of 16 5B - Calculated CheckSum -- Not sure if this needs to be there I am under the understanding that I have to calculate this every time so do I leave it out of the message an move it into the control block whic in my cas is as follows 400320 - Port/Error - 3 400321 - Message Number - 21 (where I have my message set-up) 400322 - Number of registers required - 22 400323 - Number of registers transmitted - 22 400324 - Status to Solve - 0 400324 - Unassigned - 0 400326 - Checksum -0000 HEX (is this where I calculate the checksum and add it?) Any assistance would be greatly apreciated
  15. Does anyone know of a simple way to calculate cube root with an old modicon PLC 984 Thanks