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Brand: Allen-Bradley
Allen-Bradley 1756-OB16E ControlLogix 16-Point DC Output Module
Description
Electronically fused 24 V DC sourcing outputs
The Allen-Bradley 1756-OB16E is a sixteen-point 12/24 V DC sourcing output module with electronic protection, intended for solenoids, relays, indicator lamps and contactor coils. It supplies up to 1 A per point and 8 A per module at 60 C, and its outputs can be synchronised to the coordinated system time of the chassis for scheduled switching.
The E in the catalog number stands for electronically fused: each group of eight points is protected electronically rather than by a replaceable fuse, which removes the maintenance step of changing blown fuses on solenoid valve circuits.
Technical specifications
| Parameter | Specification |
|---|---|
| Catalog number | 1756-OB16E (1756-OB16EK conformal coated listed separately) |
| Outputs | 16, electronically fused per group (8 points per group) |
| Voltage category | 12/24 V DC source |
| Operating voltage range | 10 to 31.2 V DC |
| Current per point, max | 1 A at 60 C |
| Current per module, max | 8 A at 60 C |
| Surge current per point | 2 A for 10 ms, repeatable every 2 s (typical, at 0 C, 24 V DC) |
| On-state voltage drop, max | 400 mV DC at 1 A |
| Off-state leakage, max | 1 mA per point |
| Load current, min | 3 mA per point |
| Output delay, off to on | 70 us nominal / 1 ms max |
| Output delay, on to off | 360 us nominal / 1 ms max |
| Scheduled outputs | Synchronisation within 16.7 s max to Coordinated System Time (as printed) |
| Fault / program mode states | Hold last state, on or off (off is default) |
| Backplane current | 250 mA at 5.1 V DC; 2 mA at 24 V DC (1.32 W) |
| Power dissipation, max | 4.1 W at 60 C (13.98 BTU/hr) |
| Isolation | 250 V continuous basic, output to backplane and group to group |
| Temperature code | T4 |
| Operating temperature | 0 to +60 C |
| Non-operating temperature | -40 to +85 C |
| Vibration / shock | 2 g at 10-500 Hz / 30 g operating, 50 g non-operating |
| Slot width / keying | 1 slot; electronic keying, software configurable |
| Enclosure / wire category | Open-style; wire category 1 |
Behaviour on fault and in program mode
Each point can be configured to hold its last state, go on or go off when the controller faults or is switched to program mode, with off as the default. This is the setting to review for valve and trip circuits before a controller replacement, because the choice decides what the field does when the chassis loses its controller.
Choosing between the OB16 family modules
The OB16E suits ordinary 24 V DC loads. When field-fault visibility is needed, the 1756-OB16D diagnostic output is the alternative, but it has a narrower 19.2 to 30 V window and a lower per-module current. The low 3 mA minimum load means very small relays and LEDs still switch cleanly. Confirm series, K suffix and terminal block before ordering; values come from the manufacturer technical data.
Documents and quotation
The linked Rockwell Automation technical data covers the full 1756 I/O range (file size about 15 MB, hosted by Rockwell Automation). Related PLC hardware sits in the PLC & I/O Cards category. Send your catalog number and quantity to Seven Star LLC, an independent supplier in Muscat, for a quotation.
Datasheets & Documents
- Technical data Rockwell Automation 1756 ControlLogix I/O Specifications, publication 1756-TD002U (September 2026) Download
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About brand
Allen-Bradley is the brand of Rockwell Automation for industrial control: ControlLogix and CompactLogix controllers, I/O systems, PanelView operator terminals, PowerFlex drives, motor control and industrial network equipment. The company began in Milwaukee in 1903, when Lynde Bradley and Dr. Stanton Allen formed the Compression Rheostat Company to make the motor speed controller Bradley had invented in 1901. It took the name Allen-Bradley in 1909 and was bought by Rockwell International in 1985. Since 2001 its owner has been Rockwell Automation, which is still headquartered in Milwaukee, Wisconsin.
Allen-Bradley company profile
| Founded | 1903, Milwaukee, Wisconsin, USA, as the Compression Rheostat Company |
|---|---|
| Founders | Lynde Bradley (inventor of the compression rheostat, 1901) and Dr. Stanton Allen (investor); Harry Bradley joined in 1904 |
| Name | Allen-Bradley Company from 1909 |
| Ownership | Acquired by Rockwell International in 1985 for about USD 1.65 billion; a brand of Rockwell Automation (NYSE: ROK) since 2001 |
| Headquarters | Milwaukee, Wisconsin, USA |
| Product families | Logix programmable automation controllers (ControlLogix, CompactLogix), legacy SLC 500 and MicroLogix PLCs, Micro800 controllers, POINT, FLEX and Compact I/O, PanelView HMIs, PowerFlex AC drives, contactors, motor starters and soft starters, safety components, Stratix Ethernet switches |
Milestones
- 1901: Lynde Bradley invents the compression rheostat to control the speed of electric motors.
- 1903: The Compression Rheostat Company is formed in Milwaukee with an initial investment of USD 1,000.
- 1904: Harry Bradley joins; a crane controller is shown at the St. Louis World's Fair.
- 1909: The company is renamed Allen-Bradley.
- 1985: Rockwell International acquires Allen-Bradley.
- 2001: Rockwell Automation becomes the company's name; the Allen-Bradley brand marks 100 years in 2003.
Reading Allen-Bradley catalogue numbers
The first digits of an Allen-Bradley catalogue number identify the platform, which tells you what is compatible with what. 1756 is ControlLogix (chassis-based, used for large process and plant control), 1769 is CompactLogix 5370 with Compact I/O, 5069 is CompactLogix 5380 with Compact 5000 I/O, 1734 is POINT I/O, 1794 and 5094 are FLEX and FLEX 5000 distributed I/O, 1746 and 1747 belong to the older SLC 500 family, 1766 is MicroLogix 1400 and 2080 is Micro800. For drives, 25B is PowerFlex 525 and 22B is PowerFlex 40; in a code such as 25B-D010N114, "D" means 380–480 V, "010" is the output current rating, and N114 instead of N104 means the drive has an integrated EMC filter. Many plants in the region still run SLC 500 and older MicroLogix systems, which Rockwell has discontinued, so exact spares and migration to CompactLogix are both common requests.
Where Allen-Bradley products are used
In Oman and the GCC, Allen-Bradley controllers and drives run on oil and gas facilities, water treatment and pumping stations, cement, food and beverage and packaging plants, and on machines supplied by American OEMs. ControlLogix is often the platform for plant control systems, while PowerFlex drives are used on pumps, fans and conveyors.
Allen-Bradley products we list
| Family | Examples |
|---|---|
| ControlLogix | 1756-L85E, 1756-EN2T, 1756-EN2TR, 1756-IF16, 1756-IB32, 1756-PA75, 1756-A10 |
| CompactLogix and Micro controllers | 5069-L320ER, 5069-L340ERM, 1769-L33ER, 1769-L16ER, MicroLogix 1400, Micro820, SLC 500 (1746) |
| Distributed I/O | 1734-AENTR, 1734-IB8, 1734-IE2C, 1734-IB8S safety, 1794-AENTR, 5094-AENTR, 5069-IF8 |
| Operator terminals | PanelView Plus 7 10-inch, PanelView Plus 7 15-inch, PanelView 800, PanelView 5310 |
| Drives, motor control and networking | PowerFlex 525, PowerFlex 755, PowerFlex 4, 150-A180NBD SMC, Stratix 2000, 1783-NATR |
Ordering Allen-Bradley products: what we need
Send the full catalogue number and the series letter from the label (for example 1756-EN2T Series D), because firmware and compatibility can change between series. For drives, add the motor power, voltage and filter option. For a discontinued SLC 500 or MicroLogix part, tell us whether you need the exact spare or a migration proposal.
Facts checked against Rockwell Automation's published company history, October 2026.
Browse Allen-Bradley products by category: PLC & I/O Cards, AC Drives.
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Frequently Asked Questions
What type of output is the 1756-OB16E?
A 12/24 V DC sourcing, electronically fused output with 16 points.
What is the load limit?
1 A per point and 8 A per module at 60 C.
Is there a fuse to replace?
No, protection is electronic per group of eight points.
Can outputs be time-scheduled?
Yes, outputs can be synchronised to Coordinated System Time within 16.7 s as printed.
What happens on controller fault?
Each point can hold last state, go on or go off; off is the default.
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