Rockwell Automation 1794-IH16 FLEX I/O 125V dc Digital Input Module - Manual (Page 3)

FLEX I/O 125V dc Digital Input Module 3
Publication 1794-IN118A-EN-P - June 2008
Configure Your Input Module
You configure your input module by setting bits in the configuration word (word 3).
Set the Input Filter Time for the 1794-IH16
To set the input filter time, set the associated bits in the output image
(complementary word) for the module.
Input Filter Times
Dec 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Oct 17 16 15 14 13 12 11 10 7 6 5 4 3 2 1 0
Read I15 I14 I13 I12 I11 I10 I9 I8 I7 I6 I5 I4 I3 I2 I1 I0
Write Not used = Set to 0 Input filter
FT1 12-15
Input filter
FT0 0-11
Where I = Input
FT0 = Input filter time for inputs 0-11
FT1 = Input filter time for inputs 12-15
Bits Description Selected Filter Time
02 01 00 Filter Time for inputs 00...11
05 04 03 Filter Time for inputs 12...15
0 0 0 Filter Time 0 (Default) 0.25ms
0 0 1 Filter Time 1 0.50ms
0 1 0 Filter Time 2 1ms
0 1 1 Filter Time 3 2ms
1 0 0 Filter Time 4 4ms
1 0 1 Filter Time 5 8ms
1 1 0 Filter Time 6 16ms
1 1 1 Filter Time 7 32ms
O:010
FT = 00...11
09 08 07 06 05 04 03 02 01 00 15 14 13 12 11 10 Dec.
FT = 12...15
Specifications - FLEX I/O 125V dc Digital Input Module
Specification Description
Number of I/O channels 16, nonisolated, sinking
Module location Cat. No. 1794-TB3, -TB3S
On-state voltage 90V dc minimum
125V dc nominal
146V dc maximum
On-state current 1.0mA minimum
2.0mA nominal at 125V dc
3.0mA maximum
Off-state voltage 20V dc maximum
Off-state current 0.8mA minimum
Input impedance 60K ohms nominal
Isolation voltage 250V (continuous), Basic Insulation Type, between field side and system
Type tested at 1706V dc for 60 s, between field side and system
No isolation between individual channels
Flexbus current 80mA
Power dissipation 6W maximum @ 146V dc
Thermal dissipation 20.472 BTU/hr @ 146V dc
Indicators (field side indication,
customer device driven) 16 yellow status indicators
Input filter time (1)
Off to On
On to Off
(1) Input off-to-on filter time is the time from a valid input signal to recognition by the module.
Input on-to-off filter time is time from the input signal dropping below the valid level to recognition by the module.
0.25ms, 0.5ms, 1ms, 2ms, 4ms, 8ms, 16ms, 32ms
0.25ms, 0.5ms, 1ms, 2ms, 4ms, 8ms, 16ms, 32ms
General Specifications
Specification Description
Terminal base screw torque Determined by installed terminal base
Dimensions (with module installed)
H x W x D
94 x 94 x 69 mm
3.7 x 3.7 x 2.7 inches
External dc power supply voltage 125V dc nominal
External dc power voltage range 90...146V dc (includes 5% ac ripple)
North American temp code T4
Keyswitch position 1
Enclosure type rating None (open-style)
Wire size Determined by installed terminal base
Wiring category (1)
(1) Use this Conductor Category information for planning conductor routing. Refer to Industrial Automation Wiring and
Grounding Guidelines, publication
1770-4.1 .
2- on signal ports