Technical data

ManualsBrandsAllen-Bradley ManualsAdapter1794ASB Series B

Publication 1794-2.1 - January 2000

72 24V dc 8 Source Output Module Cat. No. 1794-OB8 FLEX I/O and FLEX Integra Product Data

Specifications - 1794-OB8

Number of Outputs 8 (1 group of 8) non-isolated, sourcing

Module Location Cat. No. 1794-TB2, -TB3, or -TB3S

Terminal Base Unit

ON-State Voltage Range 10V dc minimum

24V dc nominal;

31.2V dc maximum

ON-State Voltage Drop 0.5V dc maximum

ON-State Current 1.0mA minimum per channel

500mA maximum per channel

OFF-State Voltage 31.2V dc maximum

OFF-State Leakage 0.5mA maximum

Isolation Voltage (min) 100% tested at 850V dc for 1s between user and

system

No isolation between individual channels

Output Signal Delay

OFF to ON

ON to OFF

0.5ms maximum

1.0ms maximum

Flexbus Current (max) 60mA

Power Dissipation 3.3W maximum @ 31.2V

Thermal Dissipation 11.2 BTU/hr @ 31.2V dc

Indicators (field side

indication, logic driven)

8 yellow status indicators

Output Current Rating 4A (8 outputs @ 0.5A)

Surge Current 2A for 50ms, repeatable every 2s

Fusing Module outputs are not fused. Fusing of outputs is

recommended. If fusing is desired, you must

provide external fusing, use SAN-O MQ4-800mA

fuses.

Keyswitch Position 2

General Specifications

External dc Power

Supply Voltage

Voltage Range

Supply Current

24V dc nominal

19.2 to 31.2V dc (includes 5% ac ripple)

25mA @ 24V dc (20 to 35mA)

Dimensions HxWxD 46mm x 94mm x 53mm (1.8in x 3.7 in x 2.1in)

Environmental Conditions

Operational Temperature

Storage Temperature

Relative Humidity

Shock Operating

Non-operating

Vibration

0 to 55

C (32 to 131

-40 to 85

C (-40 to 185

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