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Description
Technical Specifications
| Product Model | 1715-OB8DE |
|---|---|
| Manufacturer | Rockwell Automation / Allen-Bradley |
| Product Type | 8-Channel Digital Output Module (Bulletin 1715 Redundant I/O Series) |
| Number of Outputs | 8 points, individually isolated |
| Output Type | Solid-state sourcing (PNP), high-side switch |
| Nominal Output Voltage | 24 V DC (operating range 18–32 V DC field power) |
| Max Output Current per Point | 1.0 A @ 24 V DC (resistive load); total module max typically 8 A |
| Backplane Current Draw | 165 mA @ 24 V DC (typical) |
| Maximum Power Dissipation | 3.0 W typical |
| Response Time (On/Off) | ≤ 1 ms typical turn-on; ≤ 1 ms turn-off |
| Isolation | 500 V AC (field side to backplane/bus), reinforced insulation |
| Diagnostic Features | Per-channel short-circuit detection, open-wire detection, overload protection, module self-diagnostics |
| Indicators | 8 × Output Status LEDs (green), 1 × Module Healthy (green/red PASS/FAIL) |
| Required Terminal Base | 1715-TASOB8DE (simplex) or 1715-TADOB8DE (duplex/redundant) |
| Operating Temperature | -25 °C to +70 °C (-13 °F to +158 °F) |
| Storage Temperature | -40 °C to +85 °C |
| Humidity | 5–95 % RH, non-condensing |
| Vibration / Shock | 2 g operating vibration; 25 g operating shock; 50 g non-operating shock |
| Dimensions (H × W × D) | Approx. 166 mm × 42 mm × 118 mm (6.54″ × 1.65″ × 4.65″) |
| Weight | Approx. 0.29 kg (0.64 lb) |
| Certifications | cULus listed, CE marked, C-Tick, KC, Ex (hazardous location options per variant), TÜV SIL-capable in redundant architecture |
Main Features and Advantages
The Allen-Bradley 1715-OB8DE stands out in the industrial I/O landscape through its native support for redundant process architectures and deep per-channel diagnostics, making it far more than a conventional digital output card.Redundant I/O architecture support: The module operates in both simplex and duplex modes when paired with the appropriate terminal base. In a duplex configuration using the 1715-TADOB8DE base, two Allen-Bradley 1715-OB8DE modules can drive the same field device through dual series output switches, such that a failure in either module does not cause loss of the field output—a critical capability for SIL-affected or continuously running process loops.Per-channel electronic protection & diagnostics: Every output point features independent electronic current limiting and short-circuit protection with automatic recovery. The module continuously monitors for overcurrent, short-to-ground, and open-wire conditions, reporting faults to the controller for alarm generation. This level of line-fault detection is essential for identifying broken field wires or failed actuators before they cause process upset.Galvanic isolation & reinforced insulation: Each output group is galvanically isolated from the backplane communication bus (500 V AC tested), protecting sensitive control-system electronics from field-side transients, ground loops, and inductive kickback when driving solenoids, contactors, or pilot lamps.Dual redundant field power inputs: The terminal base accepts two independent 24 V DC field power feeds (A and B) so that loss of one power supply does not interrupt module operation—particularly valuable in redundant power architectures alongside the 1606-XL series PSUs such as the 1606-XL480EP.Hot-swap / online replacement: In a redundant (duplex) configuration, a faulty Allen-Bradley 1715-OB8DE can be removed and replaced without interrupting the process signal or powering down the I/O rack, significantly reducing mean time to repair (MTTR).Rich status indication: Individual green LEDs show the commanded ON state of each output, while a bi-color PASS/FAIL LED gives at-a-glance confirmation of module communications and internal health, expediting field troubleshooting without a laptop.
Application Field
The Allen-Bradley 1715-OB8DE is primarily specified for process industries and critical-infrastructure automation where high system availability and comprehensive I/O diagnostics are contractually or operationally required. In oil & gas, refining, petrochemical, and pharmaceutical batch processing plants, the module is used to drive on/off solenoid valves, pump start/stop contactors, stack lights, and audible alarms—often in duplex redundant pairs to satisfy the availability requirements of continuous-process loops that cannot tolerate spurious trips or undetected wiring faults.Within power generation and water/wastewater treatment facilities, the Allen-Bradley 1715-OB8DE controls motor-operated valves (MOVs), chemical dosing pumps, and blower starters, with its open-wire detection capability helping operators identify failed field circuits during routine surveillance rather than at the moment of demand. In high-availability discrete manufacturing—such as automotive body shops, glass production lines, or semiconductor wet benches—the module is deployed wherever a ControlLogix redundant controller pair is used and the I/O layer must match that fault-tolerance level.Because the Allen-Bradley 1715-OB8DE requires a dedicated terminal base, system designers select the simplex base (1715-TASOB8DE) for standard applications and the duplex base (1715-TADOB8DE) for true N+1 or 1:1 redundant field wiring. The module integrates transparently into RSLogix/Studio 5000 via the 1715 adapter module, appearing as standard tags with added diagnostic members for fault word and channel status, making it straightforward to incorporate into both new designs and retrofit projects upgrading legacy redundant I/O.
Related Products
- 1715-IB8DE — 8-channel 24 V DC digital input module in the same Bulletin 1715 redundant I/O series; typically specified alongside the 1715-OB8DE for complete redundant DI/DO islands.
- 1715-TASOB8DE — Simplex (single) terminal base assembly required to mount and wire one 1715-OB8DE in non-redundant applications.
- 1715-TADOB8DE — Duplex (dual) terminal base assembly allowing two 1715-OB8DE modules to drive the same field outputs for redundant/fault-tolerant wiring.
- 1715-AENTR / 1715-AENTRK — EtherNet/IP redundant adapter module used to connect Bulletin 1715 I/O (including the 1715-OB8DE) to a ControlLogix or CompactLogix controller via EtherNet/IP with media redundancy.
- 1715-A2D — 2-slot DIN-rail mounted carrier/baseplate that holds one 1715 adapter and up to two I/O modules such as the 1715-OB8DE.
- 1715-OA8DE — 8-channel analog output module (4–20 mA) in the Bulletin 1715 series; alternative for analog rather than discrete actuation needs.
- 1756-OB8I — ControlLogix 8-point digital output module (sourcing, electronically protected); non-redundant alternative for standard (non-1715) ControlLogix local chassis I/O.
- 1606-XL480EP — 480 W 24 V DC switched-mode power supply (previously described); commonly used to provide the 24 V DC field power for 1715-OB8DE modules in the same enclosure.
