Allen-Bradley 1715-TADOB8DE 1715 Duplex DO Termination Assembly
The Allen-Bradley 1715-TADOB8DE is an 8-channel digital output duplex termination assembly designed for high-availability applications within the 1715 Redundant I/O platform. Functioning as the field-wiring interface for two redundant 1715-OB8DE digital output modules, it routes control signals to output devices while enabling dual-module fault tolerance and continuous online maintenance. The assembly accommodates passive parallel channel routing, allowing either module to drive field output loops without interrupting process operations during hardware removal or replacement.
System Architecture & Duplex Operation
The 1715-TADOB8DE connects to the 1715 I/O base unit to interface two paired 1715-OB8DE digital output modules. Internal signal paths route each of the 8 output channels in parallel across both module slots, implementing hardware-level redundancy for critical control loops. Field connections operate across a 18 to 32 V DC supply range, with each output channel rated for up to 0.5 A continuous current.
The assembly operates with low power consumption, dissipating a maximum of 3.0 W on system circuitry and 0.17 W per field loop. Insulation testing supports 50 V continuous basic isolation between I/O ports and the backplane bus, with withstand testing rated at 500 V AC for 60 seconds. All circuit boards feature standard conformal coating to protect against corrosive industrial atmospheres.
Mechanical Installation & Field Wiring
Field wiring connects to terminal block screw terminals tightened to a recommended torque of 0.5 N-m (4.4 lb-in). The assembly features standard open-style IP20 ingress protection suitable for mounting in protected control enclosures on 35 mm DIN rails.
| Parameter | Specification |
|---|---|
| Model | 1715-TADOB8DE |
| Brand | Allen-Bradley / Rockwell Automation |
| Product Line | 1715 Redundant I/O |
| Assembly Type | Digital Output Duplex Termination Assembly |
| Supported Modules | 2x 1715-OB8DE Digital Output Modules |
| Channel Capacity | 8 Output Channels (Duplex Redundant) |
| Operating Voltage Range | 18 to 32 V DC |
| Channel Current Rating | 0.5 A per channel max |
| Power Dissipation | 3.0 W max (System), 0.17 W max (per field loop) |
| Isolation Voltage | 50 V continuous (basic insulation, I/O ports to backplane) |
| Dielectric Withstand Test | 500 V AC for 60 s |
| Wire Size | 0.75 to 1.5 mm² (18 to 16 AWG) solid or stranded copper (85 deg C min) |
| Screw Terminal Torque | 0.5 N-m (4.4 lb-in) |
| Ingress Protection | IP20 / NEMA Open-Style |
| Operating Temperature | -25 to 70 deg C (-13 to 158 deg F) |
| Vibration Resistance | 2 g operational |
| Environmental Protection | Conformal Coated (ANSI/ISA-S71.04 Class G1, G2, G3) |
| Dimensions (H x W x D) | 132 x 84 mm (5.25 x 3.375 in) base profile |
| Weight | 0.26 kg (0.57 lbs / 260 g) |
Frequently Asked Questions
Q: Can the 1715-TADOB8DE be operated with only a single 1715-OB8DE module installed? A: Yes. While designed for duplex configuration, the termination assembly supports simplex operation with one 1715-OB8DE module installed. A second output module can be added at any time to establish fault-tolerant duplex operation without rewiring field terminal connections.
Q: Are individual output channels isolated from each other on the 1715-TADOB8DE? A: No. The termination assembly provides 50 V continuous isolation between the I/O field ports and the internal backplane bus, but field ports share common return paths and do not offer channel-to-channel isolation.
Allen-Bradley 1715-TADOB8DE 1715 Duplex DO Termination Assembly
Allen-Bradley 1715-TADOB8DE 1715 Duplex DO Termination Assembly
The Allen-Bradley 1715-TADOB8DE is an 8-channel digital output duplex termination assembly designed for high-availability applications within the 1715 Redundant I/O platform. Functioning as the field-wiring interface for two redundant 1715-OB8DE digital output modules, it routes control signals to output devices while enabling dual-module fault tolerance and continuous online maintenance. The assembly accommodates passive parallel channel routing, allowing either module to drive field output loops without interrupting process operations during hardware removal or replacement.
System Architecture & Duplex Operation
The 1715-TADOB8DE connects to the 1715 I/O base unit to interface two paired 1715-OB8DE digital output modules. Internal signal paths route each of the 8 output channels in parallel across both module slots, implementing hardware-level redundancy for critical control loops. Field connections operate across a 18 to 32 V DC supply range, with each output channel rated for up to 0.5 A continuous current.
The assembly operates with low power consumption, dissipating a maximum of 3.0 W on system circuitry and 0.17 W per field loop. Insulation testing supports 50 V continuous basic isolation between I/O ports and the backplane bus, with withstand testing rated at 500 V AC for 60 seconds. All circuit boards feature standard conformal coating to protect against corrosive industrial atmospheres.
Mechanical Installation & Field Wiring
Field wiring connects to terminal block screw terminals tightened to a recommended torque of 0.5 N-m (4.4 lb-in). The assembly features standard open-style IP20 ingress protection suitable for mounting in protected control enclosures on 35 mm DIN rails.
| Parameter | Specification |
|---|---|
| Model | 1715-TADOB8DE |
| Brand | Allen-Bradley / Rockwell Automation |
| Product Line | 1715 Redundant I/O |
| Assembly Type | Digital Output Duplex Termination Assembly |
| Supported Modules | 2x 1715-OB8DE Digital Output Modules |
| Channel Capacity | 8 Output Channels (Duplex Redundant) |
| Operating Voltage Range | 18 to 32 V DC |
| Channel Current Rating | 0.5 A per channel max |
| Power Dissipation | 3.0 W max (System), 0.17 W max (per field loop) |
| Isolation Voltage | 50 V continuous (basic insulation, I/O ports to backplane) |
| Dielectric Withstand Test | 500 V AC for 60 s |
| Wire Size | 0.75 to 1.5 mm² (18 to 16 AWG) solid or stranded copper (85 deg C min) |
| Screw Terminal Torque | 0.5 N-m (4.4 lb-in) |
| Ingress Protection | IP20 / NEMA Open-Style |
| Operating Temperature | -25 to 70 deg C (-13 to 158 deg F) |
| Vibration Resistance | 2 g operational |
| Environmental Protection | Conformal Coated (ANSI/ISA-S71.04 Class G1, G2, G3) |
| Dimensions (H x W x D) | 132 x 84 mm (5.25 x 3.375 in) base profile |
| Weight | 0.26 kg (0.57 lbs / 260 g) |
Frequently Asked Questions
Q: Can the 1715-TADOB8DE be operated with only a single 1715-OB8DE module installed? A: Yes. While designed for duplex configuration, the termination assembly supports simplex operation with one 1715-OB8DE module installed. A second output module can be added at any time to establish fault-tolerant duplex operation without rewiring field terminal connections.
Q: Are individual output channels isolated from each other on the 1715-TADOB8DE? A: No. The termination assembly provides 50 V continuous isolation between the I/O field ports and the internal backplane bus, but field ports share common return paths and do not offer channel-to-channel isolation.
