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Contact:
®
NovaTech Process Solutions, LLC
11500 Cronridge Dr., Suite 110
Owings Mills, MD 21117
T: 410.753.8300
Toll Free: 800.253.3842
www.novatechweb.com
. 16 input channels for dry contact switches
. 24 V dc provided on input high side
. Returns commoned internally
. Pulse counting option
. 24 V dc bussed field power required
Module Specications
Inputs
Number of channels ........................................................................16
OFF current ............................................................................< 0.3 mA
ON current..............................................................................> 1.2 mA
Wetting current .............................................................2.8 mA (typ.)
Minimum pulse width detected ...............................................5 ms
Max input freq in pulse counting mode (no-debounce)100 Hz
Isolation (any channel to Railbus) .....................................250 V ac
Congurable Parameters
Selectable input filter ...........................fast, slow or user defined
(User defined permits 0 to 512 ms values in 2ms steps)
Latch inputs................................................................enable /disable
Latch polarity......................................latch on high / latch on low
Pulse counting ..........................................................enable /disable
Response Time
I/O response time
Field event to new data available on Railbus............5 ms (max.)
Safety
FM non-incendive field wiring parameters (each channel)
..............V
oc
= 30 V; I
sc
= 3.5 mA; C
a
= 0.12 μF; L
a
= 1000 mH
Power Supplies
Railbus (12V) current......................................................90 mA (typ.)
.........................................................................................135 mA (max.)
Bussed Field Power.........................................60 mA, @ 18–30 V dc
NT-8121-DI-DC
Image Description
16-channel Discrete Input
24 V dc, non-isolated, module-powered
Mechanical
Module Key Code..............................................................................E1
Module width ...........................................................................42 mm
Weight............................................................................................210 g
Field Terminals
Field Wiring Recommended
Field Terminal
Compatible
Field Terminal
General Purpose NT-8617-FT-NI
16 channel DI
-
Class 1, Div 2
or Zone 2 hazard-
ous area
NT-8617-FT-NI
16 channel DI
-
NovaTech 8000 Series I/O Family
Copyright © 2007 NovaTech, LLC. All rights reserved. All trademarks
are properties of their respective owners. NovaTech is a registered
trademark of NovaTech, LLC. The information in this literature is
subject to change without notice and is not to be construed as a
warranty. DS_8121_0607