constraint_eqn_079 Subroutine

   subroutine constraint_eqn_079(tmp_cc, tmp_con, tmp_err, tmp_symbol, tmp_units)
      !! Equation for maximum CS field
      !! 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 maximum CS field
      !! #=# pfcoil
      !! #=#=# fb_cs_limit_max, b_cs_peak_flat_top_end, b_cs_peak_pulse_start, b_cs_limit_max
      !! and hence also optional here.
      !! Logic change during pre-factoring: err, symbol, units will be assigned only if present.
      !! fb_cs_limit_max : input : F-value for CS mmax field (cons. 79, itvar 149)
      !! b_cs_limit_max : input : Central solenoid max field limit [T]
      !! b_cs_peak_pulse_start : input : maximum field in central solenoid at beginning of pulse (T)
      !! b_cs_peak_flat_top_end : input real : maximum field in central solenoid at end of flat-top (EoF) (T)
      !! (Note: original code has "b_cs_peak_flat_top_end/b_cs_peak_pulse_start |  peak CS field [T]".)
      use pfcoil_variables, only: fb_cs_limit_max, b_cs_limit_max, b_cs_peak_pulse_start, b_cs_peak_flat_top_end
      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

      tmp_cc     = max(b_cs_peak_flat_top_end, b_cs_peak_pulse_start) / b_cs_limit_max - 1.0D0 * fb_cs_limit_max
      tmp_con    = b_cs_limit_max
      tmp_err    = max(b_cs_peak_flat_top_end, b_cs_peak_pulse_start) * tmp_cc
      tmp_symbol = '<'
      tmp_units  = 'A/turn'

   end subroutine constraint_eqn_079