Rockwell Automation Publication 1734-UM013N-EN-P - September 2017 179
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 vs. 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
Indicators 1 yellow lock status indicator
1 green/yellow power status indicator
8 I/O channel status indicators
Keyswitch positions (left and right) Key 1 = 8 (left); Key 2 = 2 (right)
Pilot duty rating Not rated
North America temp code T4
8 A
6 A
-20 °C
(-4 °F)
40 °C
(104 °F)
55 °C
(131 °F)
4 A
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