Allen-Bradley 1794-OB16 Flex I/O Output Module 24VDC 16 Sourcing

Product Description

The Allen‑Bradley 1794‑OB16 is a Flex I/O DC output module with 16 sourcing channels. It operates at 24 VDC nominal (10‑31.2 VDC range). Each channel delivers up to 0.5 A (8 A total). Mounting requires a 1794‑TB2, ‑TB3, ‑TB3S, ‑TB3K, or ‑TB3SK base. Additionally, it works with any 1794 Flex I/O adapter for distributed control. The keyswitch position is 2. There is no internal fuse; therefore, use external SAN‑O MQ4‑800 mA fuses.

Output signal delay: OFF→ON = 0.5 ms max; conversely, ON→OFF = 1.0 ms max. FlexBus current is 80 mA at 5 VDC. Power dissipation reaches 5.3 W max at 31.2 VDC, while thermal dissipation is 18.1 BTU/hr. Meanwhile, sixteen yellow status LEDs indicate field side logic. The module is non‑isolated between channels; however, it is tested at 850 VDC for 1 s user‑to‑system.

Technical Specifications

• Brand: Allen‑Bradley / Rockwell Automation
• Model: 1794‑OB16
• Outputs: 16 sourcing (1 group of 16)
• ON‑State Voltage: 10‑31.2 VDC (24 VDC nom.)
• ON‑State Drop: 0.5 VDC max
• Output Current: 1.0 mA min, 500 mA max per channel
• Total Current: 8 A (all 16 @ 0.5 A)
• Surge Current: 2 A for 50 ms, repeat every 2 s
• OFF‑State Leakage: 0.5 mA max
• Isolation: 50 V continuous; tested 850 VDC for 1s
• FlexBus Current: 80 mA @ 5 VDC
• Power Dissipation: 5.3 W max @ 31.2 VDC
• Thermal Dissipation: 18.1 BTU/hr
• Signal Delay: OFF→ON 0.5 ms; ON→OFF 1.0 ms
• External Supply: 24 VDC nom. (19.2‑31.2 VDC)
• Supply Current: 49 mA @ 24 VDC (38‑65 mA)
• Dimensions (HxWxD): 46 x 94 x 53 mm (1.8 x 3.7 x 2.1 in)
• Weight: 78 g (2.75 oz)
• Operating Temp: 0 to 55 °C (32 to 131 °F)
• Storage Temp: -40 to 85 °C (-40 to 185 °F)
• Humidity: 5‑95% noncondensing
• Shock (Oper.): 30g peak, 11 ms pulse
• Shock (Non‑op.): 50g peak, 11 ms pulse
• Vibration: 5g @ 10‑500 Hz (IEC 68‑2‑6)

Installation & Compatibility

Mount on 1794‑TB2, ‑TB3, ‑TB3S, ‑TB3K, or ‑TB3SK terminal bases. For distributed I/O, use any 1794 Flex I/O adapter. Up to 8 modules per rack are possible. Furthermore, it works as local I/O for FlexLogix (1794‑FLA). Keyswitch position is 2. Since there is no internal fusing, external fuse is recommended (SAN‑O MQ4‑800 mA). Wiring size depends on the base unit.

Diagnostics & Maintenance

Sixteen yellow LEDs show field side status per channel. Logic‑driven indicators simplify troubleshooting. No calibration is ever needed. External fusing protects the module effectively. Fault detection works via LED and PLC logic. Consequently, replacement is easy without system shutdown.

Environmental & Certifications

• c‑UL‑us, CSA, CE, Ex, TÜV, KC, EAC, RCM
• Open enclosure, IP20
• IEC Temperature Code T3
• Operating temp: 0‑55 °C; storage: -40‑85 °C
• Shock / vibration tested to industrial standards

Typical Applications

Distributed I/O for conveyor systems, packaging lines, material handling, machine control, and factory automation. It replaces obsolete hardwired relay panels. For instance, it is ideal for sourcing DC loads like solenoids, indicators, and contactors.

FAQ

Q: Does this module have internal fusing?
A: No. Use external SAN‑O MQ4‑800 mA fuses.

Q: Can I use it with 1794‑TB2 base?
A: Yes. Compatible with TB2, TB3, TB3S, TB3K, TB3SK.

Q: What is the max total current?
A: 8 A (16 x 0.5 A).

Q: Are channels isolated?
A: No channel‑to‑channel isolation; only user‑to‑system at 850 VDC.

Q: What is the keyswitch position?
A: Position 2.

Why Buy From Oiltech Controls?

• 15+ years in industrial automation spares
• Global shipping with FedEx, UPS, DHL
• Tested surplus / refurbished options
• 12‑month warranty
• Technical verification before shipment
• Support obsolete control systems

Contact: info@oiltechcontrols.com | +86 158 8020 0923

For Modicon Quantum series, visit our partner page.

Packaging: Anti‑static bag, industrial box. Includes module only. Terminal base sold separately.

Shipping: FedEx, UPS, DHL – worldwide express.

Warranty: 12 months from invoice date against defects.

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