No. (Hex.) Name Description Default (Range) b5-40 (017F) Frequency Reference Monitor @PID Sets the contents for monitor U1-01 [Frequency Reference] in PID control. 0 (0, 1) 0 U1-01 Includes PID Output Monitor U1-01 shows the frequency reference that was increased or decreased by the PID output. 1 U1-01 Excludes PID Output Monitor U1-01 shows the actual frequency reference.