Technical data

Publication 1794-2.1 - January 2000
FLEX I/O and FLEX Integra Product Data
120V ac 8 Isolated Output Module Cat. No. 1794-OA8I 41
120V ac 8 Isolated Output Module Cat. No. 1794-OA8I
Specifications - 1794-OA8I
Number of Outputs 8 individually isolated
Module Location Cat. No. 1794-TBNF, -TB3, -TB3S, -TBN, or -TB2
Terminal Base Unit
Maximum On-State
Voltage Drop
1.0V @ 0.5A
ON-State Current 5mA per output minimum
500mA per output maximum @ 55
o
C (sufficient to
operate an A-B Bulletin 500 NEMA size 3
motor starter);
750mA per output maximum @ 35
o
C;
1.0A on 4 nonadjacent outputs, 500mA on the
remaining 4 outputs @ 30
o
C
OFF-State Leakage 2.25mA maximum
Output Voltage Range 85-132V ac, 47-63Hz
Output Current Rating 4.0A (8 outputs @ 500mA)
Isolation Voltage 100% tested at 2100V dc for 1s between all
channels and system
2100V dc for 1s between individual channels
Output Signal Delay
OFF to ON
ON to OFF
1/2 cycle maximum
1/2 cycle maximum
Flexbus Current (max) 80mA
Power Dissipation 4.1W maximum @ 0.5A
6.3W maximum @ 0.75A
6.3W maximum @ 1.0A
Thermal Dissipation 14.0 BTU/hr @ 0.5A
21.1 BTU/hr @ 0.75A
21.4 BTU/hr @ 1.0/0.5A
Indicators (field side
indication, logic driven)
8 yellow status indicators
Keyswitch Position 8
Surge Current 7A for 45ms, repeatable every 8 seconds
Fusing Use 1.6A, 250V ac Slow-Blow, Littelfuse pt. no.
23901.6; San-O SD6-1.6A; A-B pt. no. 94171304
(The 1794-TBNF fused terminal base comes with
SD6-1.6A fuses installed.)
General Specifications
External ac Power
Supply Voltage
Input Frequency
Voltage Range
Surge Current Capability
120V ac nominal
47-63Hz
85 to 132V ac
Maximum 50A for 1/2 cycle at powerup
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 (4mm
2
) stranded maximum
3/64 inch (1.2mm) insulation maximum
1
1
Publication
Installation Instructions 1794-5.56
Agency Certification
1
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