Allen-Bradley 1762-IF2OF2 Analog I/O Module

1762-IF2OF2 MicroLogix Combination Analog Module

Product Introduction

The 1762-IF2OF2 from Allen‑Bradley is a versatile analog combination module designed for the MicroLogix 1100, 1200, and 1400 programmable controller families. This expansion unit integrates two differential analog inputs and two single‑ended analog outputs into a single compact housing. Consequently, it reduces the need for multiple separate I/O modules and saves valuable panel space.

Both input and output channels are field‑configurable for either 0–10V DC voltage or 4–20 mA current signals. The module’s 12‑bit unipolar resolution ensures precise signal representation, while the built‑in successive‑approximation ADC delivers reliable conversion. Furthermore, the 1762-IF2OF2 supports full‑scale ranges up to 10.5V and 21 mA, providing extra headroom for process variability.

This module is particularly suitable for applications that require monitoring of process variables like flow, level, pressure, or temperature, alongside driving modulating actuators such as control valves, VFDs, or dampers. Its differential input design improves noise immunity, and the single‑ended outputs simplify wiring to field devices. Additionally, the module communicates with the controller via a ribbon cable that connects to the adjacent bus, ensuring seamless integration.

With its robust operating temperature range of –20 to 65 °C and high shock tolerance, the 1762-IF2OF2 performs reliably in demanding industrial environments. Whether you are upgrading an existing system or building a new control panel, this combination I/O module offers a balanced mix of functionality, accuracy, and economy.

Technical Specifications

The 1762-IF2OF2 delivers solid analog performance across its input and output channels. Key parameters include:

• Inputs: 2 differential, unipolar channels

• Outputs: 2 single‑ended channels

• Nominal input/output signals: 0–10V DC (voltage) and 4–20 mA (current)

• Full‑scale range: 0–10.5V DC and 0–21 mA

• Resolution: 12‑bit unipolar

• ADC type: Successive approximation

• DAC type: Resistor string

• Input impedance: 200 kΩ (voltage terminal), 250 Ω (current terminal)

• Update time: 2.5 ms per input channel

• Repeatability: ±0.12%

• Non‑linearity: ±0.12%

• Overall accuracy: ±0.55% full scale (–20 to 65 °C), ±0.3% at 25 °C

• Common‑mode rejection: 55 dB at 50–60 Hz

• Common‑mode voltage range: ±27V DC

• Input protection: ±30V (voltage), ±32 mA (current)

These specifications ensure that the 1762-IF2OF2 provides stable and repeatable measurements, even in electrically noisy environments. The built‑in channel diagnostics report over‑range or under‑range conditions via bit reporting and process alarms, which simplifies troubleshooting and maintenance.

Mechanical & Environmental Ratings

The module is built to withstand harsh industrial conditions. Its mechanical and environmental specifications include:

• Dimensions (H x W x D): 90 x 87 x 40 mm (3.54 x 3.43 x 1.58 in)

• Weight: Approximately 240 g (0.53 lb)

• Operating temperature: –20 to 65 °C (–4 to 149 °F)

• Storage temperature: –40 to 85 °C (–40 to 185 °F)

• Relative humidity: 5–95% non‑condensing

• Altitude: 2000 m (6561 ft) without derating

• Shock tolerance: 30G maximum

• Bus current draw: 40 mA at 5V DC, 105 mA at 24V DC

Moreover, the module supports both DIN‑rail mounting and direct panel installation. In either case, proper grounding is essential to minimise electrical noise and ensure stable operation. The compact dimensions allow the 1762-IF2OF2 to be placed alongside the controller base, making efficient use of enclosure space.

Installation Guidelines

Installing the 1762-IF2OF2 is straightforward. Follow these steps for a successful setup:

1. Mounting: Secure the module on a standard 35 mm DIN rail or attach it directly to a mounting plate using the integrated clips. Ensure the module is firmly seated.

2. Bus Connection: Use the supplied ribbon cable to connect the module to the adjacent expansion port on the MicroLogix base unit. This establishes the modular bus for power distribution and data exchange.

3. Wiring: Connect field devices to the removable terminal blocks. For voltage inputs, use the designated terminals; for current loops, ensure the appropriate wiring configuration. Always twist shielded pairs and keep signal wires separated from power cables to reduce interference.

4. Grounding: Connect the module’s ground terminal to the system’s protective earth. A low‑impedance ground path is critical for optimal noise rejection and safety.

5. Configuration: Configure the input and output channel types (voltage or current) via the controller’s programming software. Set up scaling and alarm thresholds as required by your application.

After installation, power up the system and verify that the 1762-IF2OF2 is recognised by the controller. Check diagnostic bits for any wiring or configuration errors before putting the module into service.

Packaging List

When you receive your 1762-IF2OF2 module, the package includes:

• 1762-IF2OF2 analog combination module (1 unit)

• Removable terminal block (pre‑installed)

• Ribbon bus cable for interconnection

• Mounting clips for DIN‑rail or plate installation

• Quick‑start installation guide (printed)

Note: Cables, power supplies, and programming software are sold separately.

Frequently Asked Questions (FAQ)

1. Can I mix voltage and current signals on the same 1762-IF2OF2 module?
Yes, each channel is independently configurable. You can set one input for 0–10V and the other for 4–20 mA, and similarly for the two outputs, providing great flexibility for mixed signal applications.

2. What is the update time for the analog inputs?
The 1762-IF2OF2 updates each input channel every 2.5 ms. This fast response makes it suitable for dynamic process control where timely data is critical.

3. How do I protect the module from overvoltage or overcurrent?
The inputs are internally protected up to ±30V and ±32 mA. For added safety, we recommend using external surge suppressors or fuses in harsh environments, especially on long cable runs.

4. Does this module work with MicroLogix 1400 controllers?
Absolutely. The 1762-IF2OF2 is fully compatible with MicroLogix 1100, 1200, and 1400 series controllers, provided you have the appropriate bus connector and configuration software.

5. What shipping methods do you use?
We ship via FedEx, UPS, and DHL to ensure fast and reliable delivery worldwide. Please contact our sales team for tracking information and estimated transit times.