Allen-Bradley 1794-OB16

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1794-OB16

Type

Digital output module

Application

I/O module

Used with

FLEX I/O adapters and terminal bases

Voltage, on-state output, nom

24V DC, sourcing

Voltage, on-state output, min

10V DC

Voltage, on-state input, max

31.2V DC

Voltage drop, on-state output

0.5V DC

Current, on-state output, min

1.0 mA per channel

Current, off-state output, max

500 mA per channel 8 A per module

Leakage current, off-state

0.5 mA

Output surge current, max

2 A for 50 ms, repeatable every 2 s

Output delay time, On to Off

1.0 ms

External DC supply voltage

10…31.2V DC (5% ripple)

External DC supply current

20…65 mA

Power dissipation, max

5.3 W @ 31.2V DC

Thermal dissipation, max

18.1 BTU/hr @31.2V DC

Dimensions (HxWxD), approx

46 x 94 x 53 mm (1.8 x 3.7 x 2.1 in.) 94 x 94 x 69 mm (3.7 x 3.7 x 2.7 in.) installed

Isolation voltage

50V continuous, I/O to system, Tested to 850V DC for 1 s, I/O to system, No isolation between individual channels

Temperature, operating

-20…+55 °C (-4…+131 °F)

Technical documents (1)

• Rockwell Automation FLEX I/O selection guide 1794-SG002

Key features

• 16 sourcing outputs rated 24V DC
• Output surge current of 2 A for 50 ms
• On to Off output delay time of 1.0 ms
• Operating temperature range of -20…+55 °C
• Tested to 850V DC for 1 s, I/O to system

About the Allen-Bradley 1794-OB16

The 1794-OB16 is a FLEX I/O 16 point 24V DC source output module for the 1794 Flex, Flex Ex and Flex XT system (selection guide 1794-SG002). It takes an external supply of 10…31.2V DC and works from -20…+55 °C. Output surge current is 2 A for 50 ms and the On to Off delay is 1.0 ms.

What is the 1794-OB16 used for?

It switches 16 24V DC loads from a FLEX I/O node, at 500 mA per channel and 8 A per module. Isolation is 50V continuous, I/O to system, with no isolation between channels.

Lifecycle and successor

Active Mature (Rockwell Automation lifecycle status, checked 24 October 2026).

Before you order

What to photograph or confirm so the right unit is quoted.

Read the catalog number 1794-OB16, the series letter and the firmware revision from the label. Send us a photo of the label and we confirm the match before we quote.