Experimental Physics and
Industrial Control System

The luascript record (https://github.com/epics-modules/lua) makes this pretty simple. Your record would look like:

record(luascript, NAME)

{

  field(SCAN, "1 second")

  field(OOPT, "Transition to Non-zero")

  field(CODE, "@script.lua timecheck()")

  field(OUT, "RECORD_TO_PROCESS.PROC")

}

and then have a file "script.lua" either in the IOC's startup directory or in any directory specified by the environment variable LUA_SCRIPT_PATH. The file would have a function timecheck that looks like so:

function timecheck()

  -- Get the current time as a table of information

  local curr_time = os.date("*t")

  -- Check for your target time (HOURS is in 24-hour format)

  if (curr_time.hour == HOURS and curr_time.min == MINUTES and curr_time.sec == SECONDS) then

    return 1

  end

  return 0

end

Every second the luascript record processes and checks the time, if it's the time you specified, the record's VAL field gets set to 1 and that value gets sent to the PROC field of the record you want to process at that point. If you have multiple fields to process at various times, you can use the same script and just send the time values as parameters like so:

record(luascript, OneThirtyRecord)

{

  field(SCAN, "1 second")

  field(OOPT, "Transition to Non-zero")

  field(CODE, "@script.lua timecheck(1,30,0)")

  field(OUT, "RECORD_TO_PROCESS_1.PROC")

}

record(luascript, TwoThirtyRecord)

{

  field(SCAN, "1 second")

  field(OOPT, "Transition to Non-zero")

  field(CODE, "@script.lua timecheck(2,30,0)")

  field(OUT, "RECORD_TO_PROCESS_2.PROC")

}

function timecheck(hours, minutes, seconds)

  -- Get the current time as a table of information

  local curr_time = os.date("*t")

  -- Check for your target time (HOURS is in 24-hour format)

  if (curr_time.hour == hours and curr_time.min == minutes and curr_time.sec == seconds) then

    return 1

  end

  return 0

end