Allen Bradley 1771-OBD C

Brand: Allen Bradley
Model: 1771-OBD/C

Inventory situation: Goods are available in stock.

Product features

The Allen Bradley 1771-OBD/C is a dependable 16-channel non-isolated DC output module that is built exclusively for Allen Bradley's PLC-5 series controllers, making it an excellent choice for industrial automation applications. With a nominal power requirement of 48 VDC (with a range of 10-60 VDC), the Allen Bradley 1771-OBD/C provides versatile power compatibility for a variety of industrial applications. Each of the module's 16 channels can handle up to 2 A of current for resistive loads, with a total maximum current of 8 A-ideal for powering several devices at once. It also supports a pilot load current of 0.2 A per channel and a minimum load current of 2.5 mA, allowing for effective detection of load disconnections.

The Allen Bradley 1771-OBD/C boasts exceptional durability. It works well at temperatures ranging from 0°C to 60°C (32°F to 140°F) and may be stored in temperatures ranging from -40°C to 85°C (-40°F to 185°F), making it suitable for a variety of climates. The module's conformal coating protects the circuit board from moisture and dust, and it includes a 10A/250V rectifier fuse for further safety. It also has CSA and CE certifications, ensuring industrial compliance.

Installing the Allen Bradley 1771-OBD/C is simple because it fits into the B-series 1771 I/O chassis (1771-A1B to 1771-A4B, omitting 1771-A4). It requires a separate 1492-W4 terminal block and can accommodate wire sizes ranging from 22 to 14 AWG, with a suggested terminal torque of 7-9 inch-pounds. The module's tiny design (weighing around 1.5 pounds) saves space in control cabinets, while its keyed coding (positions 10-12 and 22-24) prevents incorrect insertion.

Specifications

Model	1771-OBD/C
Product Type	16-Channel Non-Isolated DC Output Module
Applicable System	PLC-5 Series Controllers
Power Requirements	10-60 VDC
Number of Outputs	16 Channels
Current per Channel	2 A (resistive load)
Total Current	8 A max
Minimum Load Current	2.5 mA (for load open detection)

Application scenarios

The Allen Bradley 1771-OBD/C is a versatile 16-channel DC output module that excels in a variety of industrial automation settings due to its dependable performance, 2A per-channel current capability, and ability to tolerate harsh operating circumstances. One of its most typical applications is in manufacturing production lines, where the Allen Bradley 1771-OBD/C integrates easily with PLC-5 series controllers to operate critical equipment. For example, it powers relay coils that activate conveyor belts, drives solenoid valves that regulate fluid flow in assembly machines, and operates DC indicator lights that signal production status-all while its 16 channels allow manufacturers to perform many jobs at the same time without the need for additional modules.

In automotive assembly plants, the Allen Bradley 1771-OBD/C is critical for precise control of auxiliary systems. It regulates the little motors that move robotic arms, activates clamping tools that keep automobile parts in place during welding or painting, and supervises the solenoids that regulate air pressure in pneumatic equipment. Its quick response rates (0.1 ms off-to-on and 0.2 ms on-to-off) ensure that these processes run smoothly and on time, and its conformal coating protects against dust and moisture in busy production environments.

The Allen Bradley 1771-OBD/C is also very useful for food and beverage processing plants. The module operates filling machines that dispense drinks or packaged foods, temperature control valves in heating or cooling systems, and activates cleaning equipment to maintain hygiene standards. It works in temperatures ranging from 0°C to 60°C and humidity levels ranging from 5% to 95% (no condensation), making it well-suited to the various circumstances of food processing plants, from dry packaging sections to damp cleaning zones.

FAQ

Q: What is the Allen-Bradley 1771-OBD/C module used for?

A: The 1771-OBD/C is a discrete output module developed for Allen-Bradley's PLC-5 and SLC 500 programmable controller systems. It is housed in a 1771 I/O chassis and serves as an interface between the controller and the field devices. Its principal function is to convert the controller's low-voltage logic signals into higher-power outputs that can drive real-world equipment such as motor starters, solenoid valves, pilot lights, and relays.

Q: How do I configure the 1771-OBD/C in my PLC program?

A: Configuration is completed using your programming software (RSLogix 5 for PLC-5 or RSLogix 500 for SLC 500). A basic discrete output module is not normally configured with the same settings as an analog or communication module. Instead, you properly address it in your I/O setup. The physical slot number in the chassis determines the I/O address in the data table (for example, O:005 for output group 5). Your ladder logic then writes to these locations, turning the physical outputs on or off.