Rockwell Automation Publication 1734-UM013J-EN-P - July 2014 163
Specifications Appendix C
Safety Digital Output Module Specifications
Attribute 1734-OB8S Series A
Safety Output
Outputs per module 8
Output type Current sourcing
Output current (each output point) 1 A max
Pulse width 475 μs
Pulse period 575 ms
Maximum field capacitance limit permitted per output 950 nF
On-state voltage drop 0.165V
Leakage current, max 0.1 mA
Short-circuit detection Yes (short high and low and cross-circuit fault detect)
Short-circuit protection Electronic
Aggregate current of outputs per module 8 A (4 A per terminal base) @ 40 °C (104 °F)
1734-OB8S temperature versus current derating for both
horizontal and vertical installations
Reaction time <6.2 ms
POINTBus
POINTBus current, max 190 mA
Power dissipation, max
(1)
4.5 W
Power dissipation, typical 3.02 W
Thermal dissipation, max 15.38 BTU/hr
Isolation voltage 50V (continuous), Basic Insulation Type between field
side and system
No isolation between individual channels
Type tested at 707V DC for 60 s
Power bus, operating supply voltage 24V DC nom
Power bus, operating voltage range 19.2…28.8V DC
Power bus current (No Load), max 75 mA
Input filter time, OFF to ON
(2)
0…126 ms (in 6 ms increments)
Input filter time, ON to OFF
(2)
Terminal base screw torque See terminal base specifications
Indicators 1 yellow lock status indicator
1 green/yellow power status indicator
8 I/O channel status indicators
8 A
6 A
-20 °C
(-4 °F)
40 °C
(104 °F)
55 °C
(131 °F)
4 A
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