Technical data

Publication 1794-2.1 - January 2000
FLEX I/O and FLEX Integra Product Data
120V ac 8 Input Module Cat. No. 1794-IA8 33
120V ac 8 Input Module Cat. No. 1794-IA8
Increasing the Input Filter Times
You can increase the input filter time (FT) for channels 00 through 07.
Select the input filter time by setting the corresponding bits in the
output image table (complementary word) for the module.
For example, to increase the off-to-on filter time to 12ms for an ac
input module at address rack 1, module group 0, set bits 02, 01, and
00 as shown below.
Input Filter Times
(Standard Mode Addressing Only)
Bits Description Selected
Filter
Maximum Filter Time
02 01 00 Filter Time
for 00-07
Off to On
1
On to
Off
2
0 0 0 Filter Time 0
(default)
256µs 8.4ms 26.4ms
0 0 1 Filter Time 1 512µs 8.6ms 26.6ms
0 1 0 Filter Time 2 1ms 9ms 27ms
0 1 1 Filter Time 3 2ms 10ms 28ms
1 0 0 Filter Time 4 4ms 12ms 30ms
1 0 1 Filter Time 5 8ms 16ms 34ms
1 1 0 Filter Time 6 16ms 24ms 42ms
1 1 1 Filter Time 7 32ms 40ms 58ms
1
Off to on filter is 8ms plus additional filter as specified. Refer to specifications.
2
On to off filter is 26ms plus additional filter as specified. Refer to specifications.
O:010
FT = 00-07
Dec. (Octal)
=3 Octal or
3 Decimal
Write Filter Time on system startup.
FLL
Fill File
Source 3
Destination #0:010
Length 1
Write FT to
complement
of input
module.
I:000
00
40103
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
100100
Specifications - 1794-IA8
Number of Inputs 8 (1 group of 8), non-isolated
Module Location Cat. No. 1794-TBN, -TB3, -TB3S, or -TB2
Terminal Base Unit
ON-State Voltage 65V ac minimum
ON-State Current
1
7.1mA minimum
OFF-State Voltage 43V ac maximum
Maximum OFF-State Current 2.9mA
Nominal Input Impedance 10.6K Ω
Nominal Input Current 12mA @ 120V ac, 60Hz
Isolation Voltage
Channel to channel
Customer power
to input channels
User to system
None
None
100% tested at 2150V dc for 1s
Maximum Input
Filter Time
OFF to ON
(time from a valid input
signal to recognition
by module)
ON to OFF
(time from input
dropping below valid
level to recognition
by module)
8.4ms, 8.6ms, 9ms, 10ms, 12ms,16ms, 24ms, and
40ms
26.4ms, 26.6ms, 27ms, 28ms, 30ms, 34ms, 42ms,
and 58ms
Filter time selectable thru output image table
Default is 8.4ms off to on/26.4 on to off
Flexbus Current (max) 30mA @ 5V dc
Power Dissipation Maximum 4.5W @ 132V ac
Thermal Dissipation Maximum 15.3 BTU/hr @ 132V ac
Indicators (field side
indication, customer
device driven)
8 yellow status indicators
Keyswitch Position 8
General Specifications
External ac Power
Supply Voltage
Voltage Range
120V ac nominal
85 to 132V ac, 47-63Hz
Dimensions HxWxD 46mm x 94mm x 53mm (1.8in x 3.7in x 2.1in)
Environmental Conditions
Operational Temperature
Storage Temperature
Relative Humidity
Shock Operating
Non-operating
Vibration
0 to 55
o
C (32 to 131
o
F)
-40 to 85
o
C (-40 to 185
o
F)
5 to 95% noncondensing
30g peak acceleration, 11(±1)ms pulse width
50g peak acceleration, 11(±1)ms pulse width
Tested 5g @ 10-500Hz per IEC 68-2-6
Conductors Wire Size
Category
12 gauge (4mm2) stranded maximum
3/64 inch (1.2mm) insulation maximum
1
2
Publication
Installation Instructions 1794-5.9
Agency Certification
1
AC inputs compatible with proximity switches with leakage ratings of I
leak
< 2.5mA and
I
on
maximum = 5mA.
2 Use this conductor category information for planning conductor routing. Refer to
publication 1770-4.1, “Industrial Automation Wiring and Grounding Guidelines for Noise
Immunity.”
Class I Division 2 certified
Groups A, B, C, D certified
Class I Zone 2 Group IIC certified