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About MisterB.Ohio

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  1. I have an application where I need to allow a Modbus Master to set the real time clock of the PLC. That way any scheduled cycles take place synchronized with the rest of the plant. Is this possible and if so what would be the process for doing so? any examples available?
  2. Ausman and Flex727 thank you for the replies. I was hoping the answer was that the parameters were saved in a system register that could be altered and then the port could be reinitialized. Having a couple of baud rate options (preset) as a minimum to choose from could work. The network ID is already configurable through the modbus init....... one other question... can the com port be initialized if it has already been initialized? ie if I set it to 9600 as a default but the end user wants to set it to 19200 can the comport init and modbus init be recalled with out error?....
  3. I am developing an instrument that will serve its data on an RS485 ModBus network. I am using a V700 Vision controller, programmed using Visilogic. The end user should be able to set the communication parameters for that network. In order to do this I would like to have a screen display the options for Baud Rate, Data Bits, Stop Bits, Parity, Instrument ID(address on 485 net). The user should be able to set these parameters and then press a button and have the com port initialize using these parameters. I have not been able to figure out how to do this. Am I missing some key information in the manual? I have done this with an ethernet connection previously... Modbus over IP. I have a screen where the IP address, network mask, gateway and Port number are all entered then the connection is reconfigured/reinitialized when the button is pressed with the new information. Is this possible with the RS 485 "Com init"?
  4. Thank You. figured it out... by triggering the counter at the specified time of day, it will start when desired.
  5. This will work if it was just a number of days. But the calibration needs to start at a specific time.
  6. I have an application where the unit needs to go through a calibration cycle every so often. This interval will be specified as a number of days between calibrations and a time of day for it to take place. There is also a screen where the calibration can be triggered manually (or through modbus). I am using a V430 PLC programmed through Visilogic. The timers only go to 100 hours, if the task is scheduled for every 15 or 20 or 30 days, what signal can I use to trigger a count down timer once a day? I can set up a decrementing counter for the number of days and trigger the calibration cycle and reset the "# of days counter." But how do I trigger it?
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