Detailed Description

The TONOperator is a on delay timer, or TON timer as referenced by IEC 61131-3 in PLC.

The TONOperator output (Q) is set to true after the input (In) is set to true, but only after the preset time delay (PT) has been elapsed.

Arguments

When operator is used inside a signal its default input is automatically tied to signal's InternalValue or previous operator's output. Its default output is automatically tied to next operator's input or to signal's Value. See also CDP Operator Usage In CDP Signals.

Example

Below are the example plots for TONOperator input (In, cyan), output (Q, orange) and corresponding elapsed time (ET, yellow).

Actual Processing Code of the TONOperator

unsigned int TONOperator<bool>::Process()
{
  if (!m_PT || !m_ET)
    return STATUS_ERROR;

  if ((bool)*m_in)
  {
    const bool timer_started = ((double)*m_ET > 0.0);
    if (!m_previous_in_value || timer_started)
    {
      if ((double)*m_ET < (double)*m_PT)
      {
        *m_ET = (double)*m_ET + GetOperatorPeriod();
        *m_Q = false;
      }
      else
        *m_Q = true;
    }
    else
      *m_Q = true;
  }
  else
  {
    *m_ET = 0;
    *m_Q = false;
  }
  m_previous_in_value = (bool)*m_in;

  return STATUS_OK;
}