Allen-Bradley 1715-TADIB16D Redundant Digital Input Termination Assembly
The 1715-TADIB16D is a duplex digital input termination assembly designed for the Bulletin 1715 Redundant I/O architecture. It provides field wiring connection points for 16 digital input channels, splitting a single field signal input across two redundant 1715-IB16D digital input modules installed on an adjacent 1715-A3IO base unit. Equipped with individual channel fuses and maintaining continuous 50V isolation between channels, it enables high-availability signal routing for critical control applications without complex external wiring.
Field Signal Routing and Duplex Isolation
The assembly interface simplifies fault-tolerant wiring by routing incoming field signals directly to dual redundant input modules. When paired with two 1715-IB16D modules, field sensor contacts connect once at the 1715-TADIB16D terminal block. Internal signal separation splits the input voltage to both module backplane slots, enabling 1oo2D (1 out of 2 with diagnostics) logic in high-availability modes.
Unlike simplex termination units, the 1715-TADIB16D supports full 50V continuous channel-to-channel isolation. This prevents field-side cross-talk, ground loops, or transient faults on one loop from compromising neighboring channels. Each channel includes an inline 50 mA protective fuse to safeguard internal backplane circuitry against field wiring overcurrent conditions.
System Architecture and Installation Requirements
The termination assembly mounts on a standard DIN rail adjacent to the 1715-A3IO 3-slot I/O base unit. Standard screw terminals accommodate wire sizes ranging from 0.33 to 1.5 mm² (22 to 16 AWG). Field connections should be tightened to a rated screw torque of 0.5 N·m (0.37 lb·ft) using a 0.4 x 2.0 mm flathead screwdriver to ensure reliable mechanical and electrical contact.
Conformally coated PCB components protect internal traces against harsh industrial atmospheres, complying with ANSI/ISA-S71.04-2013 Class G1, G2, and G3 airborne contamination levels.
| Parameter | Specification |
|---|---|
| Model | 1715-TADIB16D |
| Brand | Allen-Bradley |
| Product Type | Digital Input Duplex Termination Assembly |
| System Compatibility | Bulletin 1715 Redundant I/O System |
| Supported I/O Module | 1715-IB16D (Dual / Duplex mode) |
| Supported Base Unit | 1715-A3IO |
| Channel Count | 16 Channels |
| Operating Voltage Range | 0 to 32 VDC |
| Channel Current Rating | 6.5 mA per channel max @ 32 VDC |
| Channel Fuses | 50 mA per channel |
| Channel-to-Channel Isolation | 50V (continuous), basic insulation type |
| Dielectric Withstand | Type tested at 500 VAC for 60 s |
| Operating Temperature | -25 to +70 deg C (-13 to +158 deg F) |
| Storage Temperature | -40 to +85 deg C (-40 to +185 deg F) |
| Relative Humidity | 10% to 95% non-condensing |
| Wire Size | 0.33 to 1.5 mm² (22 to 16 AWG) solid or stranded copper wire |
| Screw Terminal Torque | 0.5 N·m (0.37 lb·ft) |
| Screwdriver Size | Flathead 0.4 x 2.0 mm |
| Mounting Options | DIN Rail Mounted |
| Ingress Protection | IP20 |
| Dimensions (H x W x D) | 132 x 84 mm (approx. 5.25 x 3.375 in) |
| Weight | Approx. 0.26 kg (0.57 lbs / 9.17 oz) |
Frequently Asked Questions
Q: What is the primary operational difference between the 1715-TASIB16D and 1715-TADIB16D termination assemblies?
A: The 1715-TASIB16D is a simplex termination assembly designed for single 1715-IB16D module configurations without channel isolation. The 1715-TADIB16D is a duplex termination assembly that routes field wiring to two redundant 1715-IB16D modules and provides 50V channel-to-channel isolation.
Q: Does field wiring need to be split manually to achieve input redundancy?
A: No. Field sensor wiring connects directly to single terminal sets on the 1715-TADIB16D. The assembly internally duplicates and isolates the signal paths to both redundant 1715-IB16D modules.
Allen-Bradley 1715-TADIB16D Redundant Digital Input Termination Assembly
Allen-Bradley 1715-TADIB16D Redundant Digital Input Termination Assembly
The 1715-TADIB16D is a duplex digital input termination assembly designed for the Bulletin 1715 Redundant I/O architecture. It provides field wiring connection points for 16 digital input channels, splitting a single field signal input across two redundant 1715-IB16D digital input modules installed on an adjacent 1715-A3IO base unit. Equipped with individual channel fuses and maintaining continuous 50V isolation between channels, it enables high-availability signal routing for critical control applications without complex external wiring.
Field Signal Routing and Duplex Isolation
The assembly interface simplifies fault-tolerant wiring by routing incoming field signals directly to dual redundant input modules. When paired with two 1715-IB16D modules, field sensor contacts connect once at the 1715-TADIB16D terminal block. Internal signal separation splits the input voltage to both module backplane slots, enabling 1oo2D (1 out of 2 with diagnostics) logic in high-availability modes.
Unlike simplex termination units, the 1715-TADIB16D supports full 50V continuous channel-to-channel isolation. This prevents field-side cross-talk, ground loops, or transient faults on one loop from compromising neighboring channels. Each channel includes an inline 50 mA protective fuse to safeguard internal backplane circuitry against field wiring overcurrent conditions.
System Architecture and Installation Requirements
The termination assembly mounts on a standard DIN rail adjacent to the 1715-A3IO 3-slot I/O base unit. Standard screw terminals accommodate wire sizes ranging from 0.33 to 1.5 mm² (22 to 16 AWG). Field connections should be tightened to a rated screw torque of 0.5 N·m (0.37 lb·ft) using a 0.4 x 2.0 mm flathead screwdriver to ensure reliable mechanical and electrical contact.
Conformally coated PCB components protect internal traces against harsh industrial atmospheres, complying with ANSI/ISA-S71.04-2013 Class G1, G2, and G3 airborne contamination levels.
| Parameter | Specification |
|---|---|
| Model | 1715-TADIB16D |
| Brand | Allen-Bradley |
| Product Type | Digital Input Duplex Termination Assembly |
| System Compatibility | Bulletin 1715 Redundant I/O System |
| Supported I/O Module | 1715-IB16D (Dual / Duplex mode) |
| Supported Base Unit | 1715-A3IO |
| Channel Count | 16 Channels |
| Operating Voltage Range | 0 to 32 VDC |
| Channel Current Rating | 6.5 mA per channel max @ 32 VDC |
| Channel Fuses | 50 mA per channel |
| Channel-to-Channel Isolation | 50V (continuous), basic insulation type |
| Dielectric Withstand | Type tested at 500 VAC for 60 s |
| Operating Temperature | -25 to +70 deg C (-13 to +158 deg F) |
| Storage Temperature | -40 to +85 deg C (-40 to +185 deg F) |
| Relative Humidity | 10% to 95% non-condensing |
| Wire Size | 0.33 to 1.5 mm² (22 to 16 AWG) solid or stranded copper wire |
| Screw Terminal Torque | 0.5 N·m (0.37 lb·ft) |
| Screwdriver Size | Flathead 0.4 x 2.0 mm |
| Mounting Options | DIN Rail Mounted |
| Ingress Protection | IP20 |
| Dimensions (H x W x D) | 132 x 84 mm (approx. 5.25 x 3.375 in) |
| Weight | Approx. 0.26 kg (0.57 lbs / 9.17 oz) |
Frequently Asked Questions
Q: What is the primary operational difference between the 1715-TASIB16D and 1715-TADIB16D termination assemblies?
A: The 1715-TASIB16D is a simplex termination assembly designed for single 1715-IB16D module configurations without channel isolation. The 1715-TADIB16D is a duplex termination assembly that routes field wiring to two redundant 1715-IB16D modules and provides 50V channel-to-channel isolation.
Q: Does field wiring need to be split manually to achieve input redundancy?
A: No. Field sensor wiring connects directly to single terminal sets on the 1715-TADIB16D. The assembly internally duplicates and isolates the signal paths to both redundant 1715-IB16D modules.
