Allen-Bradley 1715-OF8I Redundant I/O 8-Channel Isolated Analog Output Module

Product Overview

The Allen-Bradley 1715-OF8I functions as a high-integrity analog output module within the 1715 Redundant I/O platform. It provides 8 channels of fully isolated 4-20 mA current loop signals, specifically designed for mission-critical applications that require fault-tolerant performance. This module operates within a redundant pair configuration to ensure continuous process control even during a hardware fault. We supply this unit as 100% brand new and original, ensuring your safety-instrumented systems and critical loops maintain maximum uptime.

Technical Specifications

The 1715-OF8I utilizes high-resolution conversion and industrial-grade isolation to drive field actuators with extreme precision:

• Output Channels: 8 Isolated Analog Outputs

• Signal Range: 4-20 mA current loop

• Resolution: 16-bit

• Accuracy: $\pm 0.30\%$ full scale @ 40°C

• Temperature Drift: $(0.01\% + 0.1 \mu A)/°C$

• Operating Temperature: -12°C to +70°C

• Power Supply: 18-32 VDC

• Power Dissipation: < 3.6 W

• Protection Rating: IP20

• Conformal Coating: ANSI/ISA-S71.04 Class G1-G3

• Dimensions: 162 × 44 × 118 mm

• Weight: 340 g

Engineering Advantages

• Per-Channel Galvanic Isolation: Every output channel features independent isolation. This design prevents ground loops and protects the controller backplane from field-side electrical transients, a critical requirement for geographically dispersed actuators.

• Harsh Environment Readiness: Standard conformal coating (Class G1-G3) shields the internal circuitry against moisture, fungus, and corrosive atmospheric contaminants. This ensures long-term survivability in wastewater treatment, oil and gas, and chemical processing facilities.

• Hot-Swappable Redundancy: When used in a 1715 redundant adapter base, you can replace a faulty module while the process remains live. The sister module takes over the output load instantaneously, eliminating production stops during maintenance.

• Wide Thermal Envelope: The module operates reliably from -12°C up to +70°C. This eliminates the need for expensive enclosure cooling systems in many remote field locations, reducing overall capital expenditure (CAPEX).

• Precision Actuation: 16-bit resolution delivers the fine-grained control necessary for modulating valves and variable speed drives. This level of detail optimizes fuel-to-air ratios and chemical dosing accuracy.

FAQs

• Which base unit is required for mounting the 1715-OF8I?

  You must install the module onto a 1715-A3IO I/O base unit. This base supports DIN rail mounting and provides the necessary backplane connectivity for the redundant I/O bus.

• Does this module support voltage outputs like 0-10V?

  No. The 1715-OF8I specifically generates 4-20 mA current signals. To drive voltage-controlled devices, you must use a precision external shunt resistor or an appropriate signal conditioner.

• How does the module handle a power supply failure?

  The 1715 architecture monitors the 18-32 VDC input constantly. In a redundant configuration, the standby module maintains the output signal if the primary module loses power or detects an internal failure.

• What wire gauge should I use for field connections?

  The terminal blocks accommodate shielded cables ranging from 22 to 16 AWG. We recommend using shielded twisted-pair wiring to maintain signal integrity and meet EMC requirements in high-noise industrial environments.