FLEX I/O AC Digital Output Modules
17
Publication 1794-IN103D-EN-P - July 2018
Specifications
Specifications – 1794-OA8, 1794-OA8K, 1794-OA8I
Attribute
1794-OA8, 1794-OA8K
1794-OA8I
Number of outputs
8, nonisolated
8, isolated
Recommended terminal base unit
1794-TBN
(4)
, 1794-TBNF, 1794-TB2, 1794-TB3, 1794-TB3S,
1794-TBKD, 1794-TBNK, 1794-TBNFK, 1794-TB3K, 1794-TB3SK
Output voltage, min
85V AC
Output voltage, nom
120V AC
Output voltage, max
132V AC
Output current rating
4.0 A (8 outputs @ 500 mA)
On-state current, min
5.0 mA per output
On-state current, max
(1)
(1)
Below 50 mA the voltage drop across the module will be higher and the voltage waveform may have some small
oscillation (less than 5V).
500 mA per output @ 55 °C (sufficient to operate an Allen-Bradley
Bulletin 500 NEMA size 3 motor starter)
750 mA per output @ 35 °C
1.0 A on 4 non-adjacent outputs, 500 mA on the remaining 4
outputs @ 30 °C
On-state voltage drop, max
1.0V @ 0.5 A
Surge current
7 A for 40 ms, repeatable every 8 seconds
Off-state leakage current, max
2.25 mA
Isolation voltage
120V (continuous), field to
backplane
Tested @ 1250V AC for 60 s
No isolation between individual
channels.
120V (continuous), field to
backplane, channel to channel
Tested @ 1250V AC for 60 s
Isolation between individual
channels.
Output signal delay
(2)
Off to On
On to Off
1/2 cycle max
1/2 cycle max
FlexBus current
80 mA @ 5V DC
Power dissipation, max
4.1 W @ 0.5 A
6.3 W @ 0.75 A
6.3 W @ 1.0 A
Thermal dissipation, max
14.0 BTU/hr @ 0.5 A
21.2 BTU/hr @ 0.75 A
21.4 BTU/hr @ 1.0 A
Fusing
(3)
1.6 A, 250V AC slow-blow, Littelfuse 23901.6; San-O SD6-1.6 (1.6
A fuses come preinstalled in 1794-TBNF terminal base units.)