Parameter
| Parameter | Value/Description |
|---|---|
| Product Model | 1715-OB8DE |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Category | 8-Point Digital Output Module |
| Output Signal | 1A @ 18-32V DC per output |
| Power Supply | 165 mA @ 24V DC |
| Number of Outputs | 8 |
| Module Type | Redundant I/O, DC Digital |
| Safety Rating | SIL 2 (IEC 61508) |
| Dimensions | 166 × 42 × 118 mm |
| Weight | Approximately 0.29 kg |
| Mounting | DIN Rail |
| Wire Size | 18 to 16 AWG |
| Operating Temperature | -25°C to +70°C |
| Power Dissipation | 3 Watts Maximum |
Technical Principles and Innovative Values
Innovation Point 1: True Redundant Architecture with Hot-Swap Capability. The 1715-OB8DE is designed for duplex configurations where two modules operate in parallel to form a fault-tolerant output stage. In this architecture, each output channel is controlled by two fail-safe output switches that are combined in parallel, automatically creating the redundant output configuration . When a fault occurs during normal operation, the faulty 1715-OB8DE module can be removed and replaced without interrupting signals to the live system—a capability that eliminates the need for scheduled downtime during module maintenance .
Innovation Point 2: Per-Point Electronic Fusing with Thermal Cut-Out Protection. The 1715-OB8DE employs electronic fusing on a per-point basis, using a thermal cut-out principle to protect the module from short circuit conditions. When a short circuit occurs on an output channel, the channel limits current within milliseconds after reaching its thermal cut-out temperature . Unlike conventional fuses that require physical replacement, the electronic fuse in the 1715-OB8DE can be reset through the Logix Designer application or ladder logic running on the controller, reducing maintenance time and eliminating the need to stock replacement fuse inventory.
Innovation Point 3: Comprehensive Diagnostic Suite with No-Load and Short-Circuit Detection. The 1715-OB8DE provides line monitoring for short circuits and open circuits on all outputs, with diagnostic tags available in the controller program . The module includes a NoLoad diagnostic that indicates when no load is detected on a channel, and a ShortCircuit diagnostic that flags overcurrent conditions . These diagnostics enable predictive maintenance by identifying degrading field wiring or failing loads before they cause unplanned downtime.
Innovation Point 4: Configurable Shutdown States for Fail-Safe Operation. The 1715-OB8DE supports per-point configuration of output behavior during communication failure or processor program mode, with options including On-energize, Off-de-energize, and Hold Last State . This flexibility allows engineers to design output responses appropriate to each load type—for example, energizing ventilation fans on communication failure while de-energizing motor starters to bring equipment to a safe state.
