Function Blocks
XFR Bumpless Analog Transfer Switch Function Block
436 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
XFR Bumpless Analog Transfer Switch Function Block
Description
The XFR label stands for Bumpless Analog Transfer Switch.
This block is part of the
Signal Selectors category.
Function
Provide “bumpless” switching between two analog input values (X, Y) that is triggered by a digital input
signal (*SY). When switched, the output ramps to the new value at a specified rate.
The rate at which the output
(OUT) changes to a switched value (Y or X) is set by YRATE and XRATE
configuration values, respectively.
• If SY is switched to ON, then: OUT changes to Y value at YRATE.
• If SY is switched to OFF, then: OUT changes to X value at XRATE.
• When OUT reaches the selected target input, OUT tracks the selected input (until SY changes).
Input
X
= First analog value.
Y = Second analog value.
SY = Switch to Y command digital signal
Output
OUT
= Selected Value
Block properties
Double click on the function block to access the function block properties dialog box.
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