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Description
Technical Specifications
| Product Model | 1762-OB8 |
|---|---|
| Manufacturer | Rockwell Automation / Allen-Bradley |
| Product Type | 24V DC Sourcing Digital Output Module (Solid-State Transistor) |
| Number of Outputs | 8 Points (2 Groups × 4 Points) |
| Output Type | Sourcing (PNP), Positive Switching to Load |
| Nominal Output Voltage | 24V DC (Operating Range 20.4 – 26.4 VDC) |
| Max Current per Point | 0.5 A at 60°C (0.75 A max @ 30°C) |
| Max Module Current | 4.0 A total (all outputs combined) |
| OFF-state Leakage | ≤ 0.5 mA |
| ON-state Voltage Drop | ≤ 1.5 VDC @ 0.5 A |
| Turn-On Delay | Typ. 0.1 ms / Turn-Off Delay Typ. 1.0 ms |
| Isolation – Output to Backplane | 250V AC continuous, 1500V AC for 1 sec (test) |
| Short-Circuit Protection | Electronic per group, auto-recoverable |
| Power Consumption from Backplane | 50 mA @ 5V DC (typical) |
| Dimensions (H×W×D) | 90 mm × 40 mm × 87 mm (3.54″ × 1.57″ × 3.43″) |
| Mounting | Standard 35 mm DIN Rail or panel mount with screws |
| Operating Temperature | 0 °C to +60 °C (+32 °F to +140 °F) |
| Certifications | UL, cUL, CE, C-Tick, RoHS compliant |
Main Features and Advantages
High-speed solid-state switching:The Allen-Bradley 1762-OB8 uses NPN/PNP-compatible sourcing transistor outputs that switch in under 1 ms, enabling precise control of high-cycle DC loads without contact wear. This solid-state architecture significantly extends service life compared to relay-based modules, especially in applications involving frequent actuation.Integrated diagnostics and status indication:Each of the eight output channels on the Allen-Bradley 1762-OB8 has a dedicated green LED that illuminates when the output is active. A separate module-status LED indicates proper communication with the MicroLogix processor. In the event of a short circuit, the affected output group is electronically disabled and automatically attempts recovery once the fault clears—minimizing unplanned downtime and simplifying troubleshooting.Seamless MicroLogix expansion:The Allen-Bradley 1762-OB8 connects directly to any MicroLogix 1100, 1200, or 1400 controller or to another 1762 I/O module via the built-in ribbon connector. It is auto-detected by the RSLogix / Studio 5000 programming environment, requiring no jumpers, DIP switches, or manual addressing—reducing commissioning time and wiring complexity.Robust electrical protection:Output groups are isolated from the backplane and from logic circuits, withstanding industrial transient voltages up to 1500V AC (test). Short-circuit and overload protection per group prevents damage from miswired or failed field devices, while the low OFF-state leakage current ensures connected loads remain reliably de-energized.Compact, panel-friendly design:With a width of only 40 mm (approx. 1.57 in), the Allen-Bradley 1762-OB8 conserves valuable enclosure space and can be snapped onto standard 35 mm DIN rail or securely panel-mounted. Its rugged thermoplastic housing and broad operating temperature range make it suitable for deployment in harsh manufacturing environments.
Application Field
The Allen-Bradley 1762-OB8 is widely deployed in small- to medium-scale machine and process automation systems where 24V DC discrete control signals are required. Typical use cases include packaging machinery, conveyor sorting systems, pick-and-place equipment, bottling lines, and standalone work cells that utilize a MicroLogix 1100, 1200, or 1400 PLC as the main controller. In these applications, the Allen-Bradley 1762-OB8 drives pilot relays, 24V DC solenoid valves for pneumatic actuators, stack lights, audible alarms, and motor starter coil circuits.Because of its sourcing output topology, the module is particularly well matched to European-style NPN sensor / PNP output wiring conventions common in packaging OEM equipment. Machine builders appreciate the ability to mix and match the Allen-Bradley 1762-OB8 with other 1762 analog and discrete modules to create a tailored I/O suite that exactly fits the machine’s requirement without paying for unused channels.In retrofit scenarios, the Allen-Bradley 1762-OB8 offers a straightforward upgrade path from aging relay I/O racks—delivering faster response times, reduced panel heat load, and improved diagnostics while remaining fully compatible with existing MicroLogix control programs. Its proven reliability in dusty, vibration-prone, or temperature-variable environments makes it a preferred choice for food & beverage, material handling, plastics extrusion, and light assembly line applications worldwide.
Related Products
- 1762-IB8 — 8-point 24V DC sinking/sourcing digital input module; commonly paired with the 1762-OB8 to build a complete discrete I/O block in MicroLogix systems.
- 1762-OB16 — 16-point 24V DC sourcing digital output module in the same 1762 series; used when double the output count is required in a single slot.
- 1762-IF2OF2 — 2-channel analog input / 2-channel analog output combination module for MicroLogix 1100/1200/1400; complements the 1762-OB8 in mixed-signal applications.
- 1762-L40BXB — MicroLogix 1400 built-in I/O controller (24 DC In / 16 Relay Out version); the 1762-OB8 can be added as expansion to this CPU.
- 1762-L24BWA — MicroLogix 1200 controller with embedded I/O; the 1762-OB8 expands its digital output capacity via the local expansion port.
- 1761-CBL-PM02 — 1762 expansion interconnect cable (0.2 m / 2 ft); used to link the 1762-OB8 to the MicroLogix processor or preceding expansion module.
- 1746-OB8 — SLC 500 8-point 24V DC sourcing output module; sometimes referenced by customers comparing legacy SLC 500 I/O with MicroLogix 1762 replacements.
