constraint_eqn_042 Subroutine

   subroutine constraint_eqn_042(tmp_cc, tmp_con, tmp_err, tmp_symbol, tmp_units)
      !! Equation for cycle time lower limit
      !! author: P B Lloyd, CCFE, Culham Science Centre
      !! args : output structure : residual error; constraint value;
      !! residual error in physical units; output string; units string
      !! Equation for cycle time lower limit
      !! #=# times
      !! #=#=# ftcycl, tcycmn
      !! and hence also optional here.
      !! Logic change during pre-factoring: err, symbol, units will be assigned only if present.
      !! ftcycl : input real : f-value for cycle time
      !! t_cycle : input real : full cycle time (s)
      !! tcycmn : input real : minimum cycle time (s)
      use constraint_variables, only: ftcycl, tcycmn
      use times_variables, only: t_cycle
      implicit none
            real(dp), intent(out) :: tmp_cc
      real(dp), intent(out) :: tmp_con
      real(dp), intent(out) :: tmp_err
      character(len=1), intent(out) :: tmp_symbol
      character(len=10), intent(out) :: tmp_units

      ! if the minimum cycle time == 0 report an error
      if (tcycmn < 1.0D0) call report_error(6)
      tmp_cc =  1.0D0 - ftcycl * t_cycle/tcycmn
      tmp_con = tcycmn * (1.0D0 - tmp_cc)
      tmp_err = tcycmn * tmp_cc
      tmp_symbol = '>'
      tmp_units = 'sec'

   end subroutine constraint_eqn_042