1769-IR6 Allen-Bradley 6-Channel RTD Input Module

Allen-Bradley 1769-IR6 6-Channel RTD/Resistance Input Module

Product Introduction

The 1769-IR6 belongs to the Allen‑Bradley Compact I/O family. It provides six individually configurable input channels for RTD and resistance signals. This module supports popular RTD types including Platinum 385, Platinum 3916, Nickel 618, Nickel 672, and Nickel‑Iron 518. It also accepts direct resistance signals ranging from 150 ohms up to 3000 ohms.

You can use the 1769-IR6 with CompactLogix controllers and the MicroLogix 1500 system. For distributed I/O applications, pair it with communication adapters like the 1769-ADN DeviceNet or the 1769-AENTR Ethernet adapter. The module occupies a single slot and uses a removable terminal block (1769-RTBN18).

Additionally, this module includes built‑in signal filtering. You can select from multiple frequency options: 10 Hz, 50 Hz, 60 Hz, 250 Hz, 500 Hz, or 1 kHz. Each channel also provides open‑circuit, short‑circuit, over‑range, and under‑range detection.

Technical Specifications

The 1769-IR6 has a Sigma‑Delta converter type. Its nonlinearity is ±0.05%. Repeatability varies by sensor type:

• For Nickel and Nickel‑Iron: ±0.01 °C

• For other RTD inputs: ±0.2 °C

• For 150 ohm resistances: ±0.04 ohms

• For other resistances: ±0.2 ohms

Supported RTD sensors:

• Platinum 385: 100, 200, 500, 1000 ohms

• Platinum 3916: 100, 200, 500, 1000 ohms

• Nickel 672: 120 ohms

• Nickel 618: 120 ohms

• Nickel‑Iron 518: 10 ohms

Resistance signal ranges:

• 0 to 150 ohms

• 0 to 500 ohms

• 0 to 1000 ohms

• 0 to 3000 ohms

Electrical ratings:

• Current draw at 5.1V: 100 mA

• Current draw at 24V: 35 mA

• Heat dissipation: 1.5W maximum

• Isolation voltage: 720V DC for 1 minute (channel to bus)

• Working voltage: 30V AC / 30V DC

• Common mode voltage range: ±10V DC

Wiring & Cable Recommendations

The 1769-IR6 supports 2‑wire, 3‑wire, and 4‑wire RTD configurations. For optimal performance, follow these cable recommendations:

• 2‑wire configuration: Belden 9501 or equivalent

• 3‑wire configuration: Belden 9533 or equivalent

• 4‑wire configuration: Belden 83503 or equivalent

Use copper wire rated for 90 °C. Solid wire size ranges from 22 to 14 AWG. The removable terminal block part number is 1769-RTBN18. The replacement door part number is 1769-RD, and the replacement door label is 1769-RL2 for series B.

Mechanical & Environmental Ratings

The 1769-IR6 weighs approximately 2 lbs. Its dimensions are 1.38 x 3.43 x 4.65 inches. Shipping dimensions are 8 x 8 x 5 inches. You can mount it on a panel or a DIN rail.

Shock ratings:

• Panel mount operating: 30G

• DIN rail mount operating: 20G

• Non‑operating: 40G (panel) or 30G (DIN rail)

Vibration: 5G at 10 to 500 Hz
Operating temperature: 0 °C to 60 °C (32 °F to 140 °F)
Storage temperature: -40 °C to 85 °C (-40 °F to 185 °F)
Humidity: 5% to 95% non‑condensing
Enclosure type: Open‑style

Installation Guidelines

First, verify the power supply distance rating. Do not install the 1769-IR6 more than eight modules away from the power supply. Next, select the appropriate wiring configuration for your RTD sensor. Use the recommended Belden cables for best accuracy.

Then, attach the 1769-RTBN18 removable terminal block. For 3‑wire RTDs, ensure proper compensation lead connections. For 4‑wire RTDs, one compensation wire remains unterminated. Move the bus lever to the left until it clicks to secure electrical connection.

Furthermore, configure each channel individually using your programming software. Set the sensor type, resistance range, and filter frequency. Always shut off power before wiring or removing the 1769-IR6.

Packaging List

• 1769-IR6 module (one unit)

• Removable terminal block (1769-RTBN18)

• Replacement door (1769-RD)

• Replacement door label (1769-RL2 for series B)

• Installation instructions leaflet

Note: Certificates and warranty are not included in the package.

Shipping

We ship the 1769-IR6 via FedEx, UPS, or DHL. Standard delivery times depend on your location.

Frequently Asked Questions (FAQ)

1. Can the 1769-IR6 accept 4-wire RTD sensors?
Yes. It supports 2‑wire, 3‑wire, and 4‑wire configurations. For 4‑wire RTDs, one compensation wire is not terminated.

2. What is the open circuit detection time on this module?
The open circuit detection time ranges from 6 milliseconds to 303 seconds. You can configure this value.

3. Does the 1769-IR6 work with MicroLogix 1400?
No. It is compatible only with MicroLogix 1500 and CompactLogix controllers.

4. What filter frequencies can I select for each channel?
You can choose from 10 Hz, 50 Hz, 60 Hz, 250 Hz, 500 Hz, or 1 kHz per channel.

5. How do I know if a sensor channel has failed?
Each channel provides open‑circuit, short‑circuit, over‑range, and under‑range detection. These status indicators link to the controller's diagnostic buffer.