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Allen-Bradley 1769-IR6 CompactLogix RTD Analog Input Module

The Allen-Bradley 1769-IR6, also cataloged as the 1769-IR6 Analog Input Module, operates as a dedicated hardware component for RTD temperature signal acquisition within CompactLogix controller systems.

Hardware Specifications

Parameter	Specification
Model	1769-IR6
Brand	Allen-Bradley
Origin	USA
Product Type	RTD Analog Input Module
Product Line	CompactLogix
Weight	1.00 lb (0.45 kg)
Operating Temp	32 to 140 deg F
Storage Temp	-40 to 185 deg F
Power Consumption	1.5 W maximum heat dissipation
Number of Inputs	6 RTD inputs
Input Type	Resistance Temperature Detector (RTD)
Input Ranges	0 to 150 Ohms, 0 to 500 Ohms, 0 to 1000 Ohms, 0 to 3000 Ohms
Converter Type	Sigma-Delta analog-to-digital converter
Current Draw at 5.1 VDC	100 mA
Current Draw at 24 VDC	35 mA
Common Mode Voltage	-10 to 10 VDC
Maximum Cable Impedance	25 Ohms
Input Impedance	Greater than 10 MOhms
Relative Humidity	5 to 95%, non-condensing

PLC Backplane Communication and I/O Density Scaling

The 1769-IR6 integrates with Allen-Bradley CompactLogix controllers through the 1769 backplane interface. Therefore, the module transfers processed RTD measurement data directly to the controller memory structure for logic execution and monitoring.

The module supports six independent RTD input channels, which allows engineers to increase temperature measurement density within CompactLogix I/O assemblies. Additionally, the sigma-delta conversion method provides digital signal conversion for resistance-based temperature measurement applications.

The module supports selectable resistance ranges, including 0 to 150 Ohms, 0 to 500 Ohms, 0 to 1000 Ohms, and 0 to 3000 Ohms. As a result, users can configure the input characteristics according to different RTD sensor types and temperature measurement requirements.

Frequently Asked Questions

Q: Does the 1769-IR6 support direct RTD sensor connection?
A: Yes. The module accepts RTD resistance signals through six dedicated input channels and converts the measured resistance values into digital data for CompactLogix controller processing.

Q: What power loading does the 1769-IR6 place on the CompactLogix system?
A: The module draws 100 mA at 5.1 VDC and 35 mA at 24 VDC according to the specified electrical characteristics.

Q: Can the 1769-IR6 replace standard analog voltage or current input modules?
A: No. The 1769-IR6 is designed specifically for RTD resistance measurement and does not provide standard voltage or 4-20 mA analog input functions.

Field Installation Guidelines

Install the 1769-IR6 on a compatible CompactLogix 1769 I/O assembly and verify correct module placement before applying system power.

Connect RTD wiring according to the controller hardware manual and maintain proper separation between sensor cables and high-voltage power conductors. Use shielded instrumentation wiring when the installation environment contains electrical noise sources.

Terminate cable shields according to the site grounding standard. Avoid unnecessary cable extensions because additional resistance can affect RTD measurement accuracy.

Before commissioning, verify the configured RTD input range matches the connected sensor specification. Check channel status diagnostics through the controller software to confirm correct signal acquisition.

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