The Allen-Bradley 1794-OB16P, also cataloged as the 1794-OB16P FLEX I/O Digital Output Module, operates as a dedicated hardware component for discrete signal switching and actuator control within FLEX I/O network architectures.
Hardware Specifications
Parameter
Specification
Model
1794-OB16P
Brand
Allen-Bradley
Origin
USA
Weight
0.15 lbs (0.07 kg)
Dimensions
Standard FLEX I/O module footprint
Operating Temp
0 to 55 deg C
Power Consumption
Passive backplane load
Power Supply Voltage
24 VDC
Output Voltage Range
10 to 31.2 VDC
Output Current Rating
8 A total module load
Number of Outputs
16 nonisolated sourcing
Circuit Protection
Electronically fused / protected
Isolation Voltage
50 V continuous
Protection Rating
IP20
Mounting Format
DIN-rail / Terminal base mounting
Backplane Bus Communication Velocity and Signal Execution
The 1794-OB16P module communicates across the FLEX I/O backplane bus structure, preserving high backplane bus communication velocity during 16-channel parallel switching updates. Integrated electronic fusing safeguards the internal 24 VDC sourcing driver circuits against field short-circuit conditions, auto-resetting once fault parameters clear. Channel-to-backplane circuitry enforces a 50 V continuous isolation barrier, preventing high-voltage industrial field transients from interfering with host controller logic execution across ControlNet or EtherNet/IP networks.
Frequently Asked Questions
Q: Does the 1794-OB16P support hot-swapping or removal under power?
A: Yes. The module supports Removal and Insertion Under Power (RIUP) when mounted on a compatible FLEX I/O terminal base, allowing module replacement without disrupting backplane communications or power to adjacent hardware nodes.
Q: What happens when an electronic overload or short circuit occurs on an individual output channel?
A: The 1794-OB16P detects the overcurrent condition and electronically trips the affected channel circuit to protect the output driver, resetting automatically once the fault is cleared and output logic cycles.
Field Installation Guidelines
Align the module keying mechanism with the corresponding terminal base socket to ensure correct pin orientation before insertion.
Press the module firmly into the terminal base unit until the side locking latches click into place.
Wire the 24 VDC field power supply and 16 sourcing output loads to the respective terminal base connections using properly sized copper conductors.
Segregate DC output signal wiring from high-voltage AC cables in panel wireways to eliminate capacitive noise coupling.
Ensure the terminal base assembly maintains a solid ground connection through the unpainted metal DIN rail surface.
