Detailed Description

The CTUOperator is a rising edge counter operator, or CTU counter as referenced by IEC 61131-3 in PLC.

The CTUOperator output (Q) is set to true after the predefined number (PV) of rising edges have been detected in the input (CU).

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 CTUOperator(PV=5) input (CU, cyan), count value (CV, orange) and output (Q, yellow).

Actual Processing Code of the CTUOperator

unsigned int CTUOperator<T>::Process()
{
  if (!m_PV || !m_R || !m_Q)
    return STATUS_ERROR;

  if ((bool)*m_R)
  {
    *m_CV = 0;
    *m_R = false;
  }
  bool CU = (bool)*m_CU;
  if (CU && m_oldCU != CU && ((T)*m_CV < (T)*m_PV))
    *m_CV = (T)*m_CV + 1;
  *m_Q = ((T)*m_CV >= (T)*m_PV);
  m_oldCU = CU;

  return STATUS_OK;
}