MrPLC Member
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About BobB

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  • Birthday 11/20/43

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  • Location Sydney Australia
  • Country Australia
  • Interests Omron, gardening, single malt scotch (with crushed ice only) car racing, music (most kinds [no C&W please]).

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  1. Tips on modbus communication

    DRM21 is Device Net. CX-Protocol is used with SCU21/31/41.
  2. CJ2M-CPU35 and LS drives

    Cannot help you there. I did not write the protocol macro. I guess when sending to a slave look for a response back and if you do not get one flag it. I am no good at writing macros.
  3. CJ2M-CPU35 and LS drives

    SCU card for mine.
  4. CJ2M-CPU35 and LS drives

    Here is some sample PLC code for reading from three different register areas in a Caterpillar engine. You can also include error bits and the like if you wish. Please read the manual that comes with the file. Untitled.cxp
  5. CJ2M-CPU35 and LS drives

    There are instructions on how to set up the code in the PLC - you just download the CX-Protocol file to the serial card - everything is done in the PLC.
  6. CJ2M-CPU35 and LS drives

    Yes - I use a counter that is triggered by the busy flag to go onto the next read or write. Sometimes even the reads are sprayed all over the place and if you try to read too many registers there is something in the slave that stops the process. Also many slave devices have a limit as to how many registers can be read. Woodward controllers used to have a 30 word limit - now 100 - much better. Black Magic is comms mate! LOL
  7. Memory area

    Look up a manual for the PLC you require - they are all different.  Basic memory areas are the same though.
  8. CJ2M-CPU35 and LS drives

    If you have a look in the download section the source code is there - pull it apart.
  9. CJ2M-CPU35 and LS drives

    For Citect SCADA use the OMFINS driver included with Citect. Make sure it is the latest driver. Details for setting up come with the driver. Here is a link for Protocol Macro code for Modbus RTU.
  10. CX-One Programmer Start up error_OCX

    PITA but sometimes has to be done - I had to do it after a Sysmac Studio update crapped itself. Feel your pain.
  11. write a program on a memory cassette

    It is an electrically erasable PROM - the program is written to battery backed RAM and then can be written to the EEPROM for backup purposes only. Read the manual.
  12. Dound the problem - blown up input card - very rare.
  13. Have a CJ1M PLC with 64 bit input cards. The inputs are all flashing - cannot find anything in the manual yet. Any thoughts?
  14. Omron Force Bit Cancel via Fins

    In CX-Programmer open options - PLCs and tick the box to let you know there are forced bits on when exiting - then you will not forget.
  15. Description Entry

    Thanks Michael - just back last night from a hard week programming a pile of tricky stuff for NASA - all online - live site. We have to deal with a site wide UPS, rotary converter, mains and 8 generators and not turn the radio telescopes off. Challenging sometimes. There is no N+1 for the UPSs so if something goes wrong with one or more of them we start generators and co-generate with the UPS - or rotary converter if it is in action. I was very mentally tired - 9 hours a day for 4 days - Friday was good they were testing what I programmed. No blackouts and worked perfectly thankfully.