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Form C Inputs
Binary Inputs In
Noisy Environments
10 Point Multiplex Modules—Multiplex Binary
IUNs to transmit signals to the XBN. The presence of the IUN FM does
not change or expand the range of signals processed by the XBN.
All configurations of the XBN in relation to other modules in the
NCU/NEU panel are compatible, provided that the modules are properly
located and the points correctly defined in the software.
Wiring both states of a Form C input requires two binary input terminals,
as illustrated in Figure 5.
Note: Form C inputs must connect to adjacent screw terminal blocks,
starting at an odd-numbered block (i.e., 1 and 2, 27 and 28;
not 2 and 3, etc.).
Using all Form C inputs would reduce the point monitoring
capacity from 32 to 16.
Binary
Device
Figure 5: One Form C Input Terminating in Two Binary Inputs
To suppress nuisance signals from a noisy binary input, change the
Debounce Filter to a value higher than the default of 2 (24 milliseconds);
e.g., to 3, which yields 36 milliseconds.
An exception to this is when the input is a 0 to 10 Hz pulse input. In this
case, the Debounce filter must be 24 milliseconds or less, and shields or
other methods must be used to reduce the susceptibility of the lines to
induced noise. See Debounce Filter under the Binary Input Object
Technical Bulletin.
+
-
(5)
+
-
GND
+
(6)
-
GND
-
+
Base
Frame
xbn3
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