192 Rockwell Automation Publication 1734-UM013N-EN-P - September 2017
Appendix C Specifications
Safety Digital Output Module Specifications
Attribute 1734-OB8S Series B
Safety Output
Outputs per module 8
Output type Current sourcing
Output current (each output point), max 1 A @ 40 °C (104 °F)
0.5 A @ 55 °C (131 °F)
1734-OB8S Series B temperature vs. current per output
point derating for both horizontal and vertical
installations
Aggregate current of outputs per module
(1)
8 A (4 A per terminal base) @ 40 °C (104 °F)
2A (1A per terminal base) @ 55 °C (131 °F)
1734-OB8S Series B temperature vs. aggregate current
per module derating for both horizontal and vertical
installations
(1)
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 detect)
Short-circuit protection Electronic
Reaction time <6.2 ms
POINTBus
POINTBus current, max 125 mA
Power dissipation, max
(2)
3.5 W
Thermal dissipation, max 11.96 BTU/hr
Power dissipation, typical
(3)
2.5 W
Isolation voltage 50V (continuous), Basic Insulation Type between field
side and system
No isolation between individual channels
Type tested at 860V AC DC for 60 s
Power bus, operating supply voltage 24V DC nom, Class 2
1 A
0.5 A
-20 °C
(-4 °F)
40 °C
(104 °F)
55 °C
(131 °F)
8 A
2 A
-20 °C
(-4 °F)
40 °C
(104 °F)
55 °C
(131 °F)
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