How-To Guide  ·  Allen-Bradley 5069 Analog I/O  ·  Temperature & Process Input

5069-IY4: Wiring, Configuration, Temperature Reading, and Diagnostics

Part Number: 5069-IY4  ·  Compact 5000 Platform  ·  4-Channel Current/Voltage/RTD/Thermocouple Input  ·  Studio 5000 Logix Designer

1. Module Overview

The 5069-IY4 belongs to Rockwell Automation's Compact 5000 I/O family, designed for the CompactLogix 5380, Compact GuardLogix 5380, CompactLogix 5480, and Compact 5000 EtherNet/IP adapter systems. It provides 4 differential, non-isolated analog input channels with per-channel input type selection. Unlike the 5069-IF8, which handles only voltage and current signals, the IY4 adds native RTD and thermocouple support — reading temperature directly in engineering units without an external temperature transmitter.

Catalog Number Breakdown

Key Specifications (from 5069-TD001)

IY4 vs. IF8 — When to Use Which

2. Hardware Installation

The 5069-IY4 mounts on standard EN50022 35 x 7.5 mm (1.38 x 0.30 in.) DIN rail and connects to the Compact 5000 system bus via the side-mount connector.

RTB Selection — Standard vs. CJC

The terminal block you order depends on whether any channel will use thermocouple input:

System Assembly Order

1. CompactLogix 5380 controller (e.g., 5069-L306ER), Compact GuardLogix 5380, CompactLogix 5480, or Compact 5000 EtherNet/IP Adapter (5069-AENTR) — leftmost device
2. Compact 5000 I/O Modules — installed to the right of the controller or adapter. The 5069-IY4 can occupy any available slot. Install the module next to the right-most device in the system.
3. End Cap — required on the last module in the system to cover the exposed bus interconnection and prevent damage to the MOD and SA power bus connectors.

Mounting Procedure

1. Confirm that MOD power and all sources of SA power are off
2. If an end cap is installed on the right-most module, remove it and keep for later use
3. Align the interlocking pieces of the module with the device on the left — the top interlocking pieces engage first
4. Push the module toward the DIN rail until a click indicates it is locked in place
5. Confirm the DIN rail latch is in the closed position. If open, push the rear latch back until it clicks.
6. Hook the bottom of the RTB into the RTB tab on the module, then push the RTB against the module until it clicks into place. Push the RTB handle until you hear another click.
7. Install the end cap on the last module by aligning the interlocking pieces and pushing toward the DIN rail until it locks

3. Wiring

The 5069-IY4 uses either a 14-pin CJC RTB (for thermocouple applications) or an 18-pin standard RTB. Each channel uses three terminals: Input +, Input −, and RTD −/Com. Two shield terminals are shared across all channels (available on the 18-pin RTB). Wire size: 0.34–1.5 mm² (22–16 AWG) solid or stranded shielded copper wire rated at 105°C (221°F) or greater.

Terminal Block Pinout — 18-Pin Standard RTB (5069-RTB18)

When using the 14-pin CJC RTB, the terminal layout is the same for the first 12 pins (Channels 0–3). The shield and unused terminals are not present — if you need to ground more than two device shields, ground the remaining devices elsewhere (e.g., DIN rail via a terminal strip).

2-Wire Current Transmitter (4–20mA or 0–20mA)

A 2-wire loop-powered current transmitter is powered from an external 24VDC supply. The current signal flows through the transmitter and into the module input.

1. 24VDC power supply (+) connects to the transmitter's positive terminal
2. Transmitter negative terminal connects to the module's Input x + pin for that channel
3. Module Input x − pin connects back to the 24VDC power supply (−), completing the loop
4. Connect the cable shield/drain wire to a Shield terminal (Pin 16 or 17 on the 18-pin RTB)
5. The RTD −/Com terminal is not used for current input

Voltage Input (0–5V, 0–10V, or ±10V)

Single-ended and differential voltage sources are both supported:

1. Connect the signal source's voltage output (+) to the module's Input x +
2. Connect the signal source's voltage output (−) / GND to the module's Input x −
3. Connect the cable shield/drain wire to a Shield terminal
4. The RTD −/Com terminal is not used for voltage input

3-Wire RTD

The 3-wire RTD configuration is the most common for industrial platinum RTDs (e.g., PT100). The third wire allows the module to compensate for lead wire resistance.

1. Connect RTD wire 1 to the module's Input x +
2. Connect RTD wire 2 to the module's Input x −
3. Connect RTD wire 3 (compensation lead) to the module's RTD −/Com
4. Connect the cable shield to a Shield terminal — ground at the module end only

2-Wire RTD

2-wire RTDs have no lead wire resistance compensation. They are acceptable for short cable runs or where lower accuracy is tolerable.

1. Connect RTD wire 1 to the module's Input x +
2. Connect RTD wire 2 to the module's Input x −
3. Jumper the Input x − terminal to the RTD −/Com terminal on the same channel (this is required — the module expects a signal on the RTD −/Com terminal even in 2-wire mode)
4. Connect the cable shield to a Shield terminal

Thermocouple

Thermocouple wiring requires the 5069-RTB14CJC terminal block for cold junction compensation. The CJC RTB contains thermistors that measure the terminal temperature.

1. Connect the thermocouple positive (+) lead to the module's Input x +
2. Connect the thermocouple negative (−) lead to the module's Input x −
3. The RTD −/Com terminal is not used for thermocouple input
4. Do not connect the cable shield to the shield terminal when using the 14-pin CJC RTB (it has no shield terminals). If shielding is required, ground the shield at a separate terminal strip on the DIN rail.

Mixed Input Type Wiring

The 5069-IY4 supports mixing all four input types on a single module. For example, one module can simultaneously read a 2-wire differential current transmitter on Channel 0, a single-ended voltage signal on Channel 1, a 3-wire RTD on Channel 2, and a thermocouple on Channel 3. When any channel uses a thermocouple, the CJC RTB (5069-RTB14CJC) is required for the entire module.

Shielded Cable and Grounding Best Practices

4. Studio 5000 Configuration

Adding the 5069-IY4 to the I/O Tree

1. In Studio 5000 Logix Designer, expand I/O Configuration in the Controller Organizer
2. Right-click the controller node → New Module
3. In the module catalog, search for 5069-IY4 → select it → click Create
4. Set the Slot Number to match the physical position of the module in the Compact 5000 assembly
5. Give the module a descriptive name (e.g., Temp_Inputs_1)
6. Click OK. The module appears in the I/O tree with Channels and CJ Channels configuration nodes.

Per-Channel Configuration (Channels Page)

Double-click the module in the I/O tree and navigate to the Channels page. Each channel (Ch00–Ch03) is configured independently:

Input Ranges by Type

Temperature Range Limits (Selected Common Types)

Additional Channel Configuration Parameters

Each channel’s configuration page (accessed via the Chxx node in Module Properties) provides these additional settings:

Notch Filter and RPI Relationship

The Notch Filter setting determines the module’s sample rate and thus the minimum recommended RPI (Requested Packet Interval). Lower frequencies provide better noise rejection but require a slower RPI.

5. Reading Temperature in Ladder Logic

Data Format

For RTD and thermocouple input types, the I.Chxx.Data tag contains the temperature reading directly in the configured temperature units (Celsius, Fahrenheit, Kelvin, or Rankine) as a REAL (floating-point) value. No SCP instruction or manual scaling is required for temperature — the module performs the sensor linearization (ITS-90 for thermocouples) and unit conversion internally.

For current and voltage input types, the I.Chxx.Data tag contains the signal-level value (mA or V). Use the module’s built-in Scaling feature or an SCP instruction to convert to process engineering units.

Input Tag Structure (Module in Slot 2 Example)

Practical Example: Type K Thermocouple and PT100 RTD

Scenario: Channel 0 reads a Type K thermocouple measuring furnace temperature (configured for Celsius). Channel 1 reads a 3-wire PT100 RTD (100 Ω PT 385) measuring cooling water temperature (configured for Fahrenheit). The module is in Slot 2.

Using Module-Level Process Alarms

Instead of (or in addition to) comparison instructions in ladder logic, you can use the module's built-in 4-level process alarm system. This requires enabling alarms via the output tags and configuring setpoints in the module properties:

1. In Module Properties → Alarms page, set the HHAlarmLimit, HAlarmLimit, LAlarmLimit, and LLAlarmLimit for each channel (values are in the channel’s engineering units)
2. Optionally enable alarm latching via C.Chxx.ProcessAlarmLatchEn
3. In your ladder logic, write 1 to the output enable tags to activate each alarm level:

6. Cold Junction Compensation

What is Cold Junction Compensation?

A thermocouple generates a millivolt signal proportional to the temperature difference between its measurement tip (the hot junction) and the point where the thermocouple wire transitions to copper (the cold junction). In the 5069-IY4 system, the cold junction occurs at the RTB terminals where the thermocouple extension wire connects to the module’s copper circuitry.

The thermoelectric effect at this junction alters the input signal and must be compensated for to measure temperatures accurately. The CJC RTB (5069-RTB14CJC-SPRING or 5069-RTB14CJC-SCREW) contains two thermistors that measure the RTB terminal temperature. The module uses this measurement to mathematically compensate for the cold junction voltage, producing an accurate hot junction temperature reading.

CJC RTB Requirements

CJC Diagnostic Tags

The module provides dedicated cold junction diagnostic tags (CJChxx) in addition to the standard channel tags. These are visible in the I/O tree under CJ Channels:

7. Diagnostics & Troubleshooting

LED Indicators

The 5069-IY4 has a Module Status indicator, an I/O Status indicator, and 2 CJC status indicators (yellow/red).

Complete Input Tag Reference (I.Chxx)

Every channel (Ch00–Ch03) provides the following diagnostic and data tags:

Complete Output Tag Reference (O.Chxx)

Fault Tags (Module-Level)

Common Troubleshooting Scenarios

8. Related Modules

9. Related Guides & Resources

Reference Documentation

The following Rockwell Automation publications were used as references for this guide. These are the official manufacturer documents for the hardware covered in this article.