ALPHABETIC REFERENCE EXCEL CARE CONTROL ICONS
74-5577–33 (US) 46
EN2B-0184 GE51 R0518 (Europe)
Differential (Excel Web / Excel Web II)
Function Calculates the derivative output signal, which changes in proportion to changes of
the input signal. Y = 0 if the input is unchanged since the last cycle. Y > 0 if the
deviation is increasing. Y < 0 if the deviation is decreasing.
I/O Dialog Box
Input One analog input (X).
Output One analog output (Y)
Internal Parameters Rate time (TD)
Digital Switch / 2PT / Hysteresis (Excel Web / Excel Web II)
Function On/off controller that generates a digital output depending on the deviation of the
controlled variable from the reference variable (Y = 1 if X ≥ W, Y = 0 if
X < W − hysteresis).
I/O Dialog Box
Excel Web / Excel Web II
Inputs Two analog inputs where:
X = Controlled variable such as an outdoor air temperature sensor.
W = Reference variable such as a setpoint.
You can enter the reference variable (W) as a parameter (engineering unit index
number and value). Not for Excel Web / Excel Web II!
Outputs One digital output (YD).
Excel Web / Excel Web II: Two digital outputs (Y1, Y2). Y2 is an optional inverted
output.
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