Allen-Bradley 1756-OB16I ControlLogix Isolated Discrete DC Output Module

SKU 1756-OB16I

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Manufacturer: Allen-Bradley
Product No.: 1756-OB16I
Country of origin:United States
Product Type: Isolated DC Output Module
Payment: T/T, Western Union
Weight: 1000g
Shipping port: Xiamen
Warranty: 12 months

Allen-Bradley 1756-OB16I is a one-slot ControlLogix digital output module with 16 individually isolated 10–30 VDC outputs. Each point can be wired for sinking or sourcing operation. The module is not electronically fused.

Technical Specifications

Parameter	1756-OB16I specification
Outputs	16, individually isolated
Voltage category	12/24 VDC sink/source
Operating voltage	10–30 VDC
Pilot duty	2 A (DC-13SQ)
Output delay	1 ms maximum Off-to-On; 2 ms maximum On-to-Off
Current per point	2 A at 30 °C; linearly derated to 1 A at 60 °C
Current per module	8 A at 30 °C; linearly derated to 4 A at 60 °C
Surge current	4 A for 10 ms per point, repeatable every 2 seconds
Minimum load current	1 mA per point
Off-state leakage	0.5 mA maximum per point
On-state voltage drop	1.2 VDC maximum at 2 A
Backplane current	350 mA at 5.1 V; 2.5 mA at 24 V
Total backplane power	1.8 W
Power dissipation	3.6 W maximum at 60 °C
Operating temperature	0–60 °C

Connections and Protection

Compatible removable terminal blocks: 1756-TBCH or 1756-TBS6H.
The RTB is ordered separately; the module uses a 36-pin connection.
Outputs are not protected by internal fusing. Rockwell Automation recommends a fused interface module where output protection is required.
Each output supports Hold Last State, On, or Off for Program and Fault modes. Off is the default.
Isolation rating: 250 V continuous from outputs to backplane; 125 V continuous output-to-output, basic insulation type.

Dimensions and Shipping Record

Product dimensions (H × W × D)	144.5 × 35.1 × 140.3 mm, from Rockwell Automation drawing ABIOM021
Slot width	1 ControlLogix slot
Enclosure	Open-style
Shipping weight	1.0 kg in the PLC ProTech store record; this is not stated as manufacturer net mass

Replacement Notes

Record whether each field circuit is wired as sinking or sourcing before moving the RTB.
Do not substitute a grouped-common or electronically fused output module without reviewing the field circuit and protection scheme.
Confirm the RTB catalog number and keying before shutdown.
Back up the controller project and record the module series, firmware, electronic keying, Program-mode state, and Fault-mode state.
Check load current at the actual cabinet temperature. The 2 A point rating does not apply unchanged at 60 °C.

FAQ

Can the 1756-OB16I switch both sinking and sourcing loads?

Yes. Rockwell Automation specifies a 12/24 VDC sink/source voltage category. The field supply polarity and terminal wiring determine the operating arrangement, so preserve the original wiring diagram when replacing a module.

Are all 16 outputs individually isolated?

Yes. The outputs are individually isolated. The published isolation ratings are 250 V continuous from outputs to backplane and 125 V continuous output-to-output, both basic insulation type.

Which removable terminal blocks fit the 1756-OB16I?

Rockwell Automation lists the 1756-TBCH and 1756-TBS6H removable terminal blocks. The RTB is a separate 36-pin accessory and should be checked for catalog number, condition, and keying before reuse.

Does the 1756-OB16I have electronic output protection?

No. The module is not electronically fused. Rockwell Automation recommends a fused interface module where output protection is required.

What current can each 1756-OB16I output carry?

The limit is 2 A per point at 30 °C, linearly derated to 1 A at 60 °C. The complete module is limited to 8 A at 30 °C and 4 A at 60 °C.

Is a 1756-OB16E or 1756-OB16IEF a direct drop-in replacement?

Do not assume so. Those modules differ in protection, speed, diagnostics, and configuration. Verify the field wiring, RTB, load current, controller profile, firmware, and safety requirements before changing catalog number.

View all FAQs →

Product Documentation

Technical Datasheet (PDF) Complete specifications and technical drawings.

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Global Express Shipping

Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our professional technical warranty.

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TECHNICAL SPECIFICATIONS

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