Technical data

Publication 1794-2.1 - January 2000
82 24V dc Electronically Fused 8 Output Module Cat. No. 1794-OB8EP FLEX I/O and FLEX Integra Product Data
Specifications - 1794-OB8EP
Number of Outputs 8 (1 group of 8), non-isolated, sourcing
Module Location Cat. No. 1794-TB3, -TB3S, -TBN, or -TB2 Terminal
Base Unit
ON-State Voltage Range 19.2V dc minimum
24V dc nominal;
31.2V dc maximum
ON-State Voltage Drop 0.2V dc maximum
ON-State Current 1.0mA minimum per channel
2.0A 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
1
OFF to ON
ON to OFF
0.1ms maximum
0.1ms maximum
Flexbus Current (max) 73mA
Power Dissipation 5.5W maximum @ 31.2V
Thermal Dissipation 18.8 BTU/hr @ 31.2V dc
Indicators (field side
indication, logic driven)
8 yellow status indicators;
8 red fault indicators
Output Current Rating Maximum 2.0A per output
10A maximum per module (e.g. 8 outputs @ 1.25A,
5 outputs @ 2.0A, or similar output/
ampere combinations totaling 10A or less)
Surge Current 4A for 10ms, repeatable every 3 seconds (see
chart)
Keyswitch Position 2
Fusing Outputs are electronically protected.
General Specifications
External dc Power
Supply Voltage
Voltage Range
Supply Current
24V dc nominal
19.2 to 31.2V dc (includes 5% ac ripple)
80mA @ 24V dc
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
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
2
2
Publication
Installation Instructions 1794-5.20
Agency Certification
1 Off/on delay is time from a valid output “on” signal to output energization. On/off delay
is time from a valid output “off” signal to output deenergization.
2 You use this conductor category information for planning conductor routing as described
in the system level installation manual.
Class I Division 2 certified
Groups A, B, C, D certified
Class I Zone 2 Group IIC certified
O
utput
Mi
n
i
mum
S
urge
S
urge
C
urrent -
A
Time - ms
20
15
10
5
0
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