Allen-Bradley 1756-OB8 ControlLogix Digital DC Output Module
$123.00
$320.00
Description
Allen-Bradley 1756-OB8 ControlLogix Digital DC Output Module
The Allen-Bradley 1756-OB8, also cataloged as the 1756-OB8 Digital DC Output Module, operates as a dedicated hardware component for DC sourcing signal execution within ControlLogix I/O platforms. The module provides eight 24 VDC output channels with grouped channel architecture, field-side isolation, and backplane communication through compatible ControlLogix chassis.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1756-OB8 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.70 lbs |
| Power Consumption | 2.5 W maximum at 60 deg C |
| Module Type | Digital DC Output Module |
| Product Line | ControlLogix |
| Number of Outputs | 8 points |
| Output Type | DC Sourcing |
| Output Voltage | 24 VDC nominal |
| Operating Voltage Range | 10-30 VDC |
| Output Groups | 2 groups |
| Channels per Group | 4 channels |
| Maximum Output Current per Point | 2 A at 60 deg C |
| Maximum Output Current per Module | 8 A at 60 deg C |
| Signal Delay ON Transition | 1 ms maximum |
| Signal Delay OFF Transition | 2 ms maximum |
| Backplane Current at 5.1 VDC | 165 mA |
| Backplane Current at 24 VDC | 2 mA |
| Total Backplane Power | 0.89 W |
| Isolation Voltage | 50 V continuous |
| Removable Terminal Blocks | 1756-TBNH, 1756-TBSH |
ControlLogix Backplane Communication and I/O Scaling
The 1756-OB8 operates within the ControlLogix I/O architecture using backplane bus communication for controller data exchange and output command execution. The module supports I/O density scaling through multi-slot chassis configurations while maintaining individual channel addressing and field output control.
Firmware flash compatibility follows the ControlLogix module lifecycle structure, allowing controller-based configuration and module maintenance. The output interface provides grouped channel organization for DC field devices requiring 12/24 VDC source switching.
Frequently Asked Questions
Q: How many output channels are available on the 1756-OB8 module?
A: The module provides eight DC sourcing output channels arranged in two groups of four channels.
Q: What is the maximum current capacity of the output channels?
A: Each output point supports up to 2 A at 60 deg C, with a maximum module current rating of 8 A at 60 deg C.
Q: Which removable terminal blocks are compatible with the 1756-OB8?
A: The module supports 1756-TBNH and 1756-TBSH removable terminal blocks.
Field Installation Guidelines
Install the 1756-OB8 module into a compatible ControlLogix chassis slot and confirm correct seating of the module connector before applying field power. Verify that connected DC loads operate within the specified 10-30 VDC output range and current limitations.
Separate DC output wiring from high-voltage and high-frequency switching conductors to reduce electrical interference. Apply field cable shielding and grounding practices according to the site electrical standard. Confirm removable terminal block installation, wiring polarity, and output configuration before commissioning connected devices.
Features
Minimum Order Quantity (MOQ)
We welcome bulk orders and have a minimum order quantity of just one unit.
Certificates and Documentation
Upon request, we can provide all necessary documentation, including Certificates of Origin/Conformance and other required export documents.
Delivery Time
For items in stock, we aim to deliver within 1-3 days after payment confirmation. Items with specified lead times will be delivered according to the quoted schedule.
Payment Methods
We accept 100% T/T (Telegraphic Transfer) payment before shipping. For items with lead times, a 30% deposit is required upfront, with the remaining 70% due before shipment. For RMB transfers, please contact us if you have an agent in China.
Warranty
We offer a standard one-year warranty on all new and original items. If you require an extended warranty, please contact us for additional cost details.
Refund and Return Policy
Your satisfaction is important to us. If you need to return an item, it must be done within 30 days of the order date. The product must be unused, unopened, and in its original packaging with all accessories included. Refunds are processed within 5-7 business days after we receive the returned item. Please note that shipping and related charges are non-refundable.
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