6ES7288-3AR04-0AA0 S7-200 SMART RTD Module

Siemens 6ES7288-3AR04-0AA0: SIMATIC S7-200 SMART EM AR04 RTD Temperature Module

The Siemens 6ES7288-3AR04-0AA0 (Expansion Module EM AR04) is a precise 4-channel resistance temperature detector (RTD) input module designed for the SIMATIC S7-200 SMART PLC series. Purpose-built for high-accuracy temperature acquisition, this module allows direct connection of Pt100, Pt1000, Ni100, and other standard resistance sensors to monitor temperature-critical processes.

Featuring 16-bit signal conversion resolution, configurable 2-wire, 3-wire, or 4-wire connection modes, and integrated line-noise suppression, the EM AR04 delivers stable temperature measurements for process control, HVAC systems, and industrial machinery.

Key Technical Specifications

• Part Number: 6ES7288-3AR04-0AA0 (MLFB: 6ES7288-3AR04-0AA0)

• Product Series: SIMATIC S7-200 SMART

• Module Type: RTD Resistance Temperature Analog Input Module (EM AR04)

• Number of Inputs: 4 analog channels dedicated to RTD sensors / resistance measurements

• Supported RTD Types: Pt10, Pt50, Pt100, Pt200, Pt500, Pt1000, Ni10, Ni120, Ni1000, Cu10, and resistance ranges (150 Ω, 300 Ω, 600 Ω)

• Wiring Configurations: Supports 2-wire, 3-wire, and 4-wire RTD connections

• Resolution: 15 bits + sign (16 bits total)

• Isolation: 500 V AC optical isolation between field circuitry and backplane bus

• Diagnostic Indicators: Front LED indicators for module health and channel status faults

• Dimensions (W x H x D): 45 mm x 100 mm x 81 mm

• Weight: Approx. 145 g

Key Features and Industrial Benefits

High-Precision 16-Bit Resolution

Delivers temperature readings down to fractions of a degree, making it ideal for closed-loop PID control applications where temperature precision is essential.

Versatile Sensor Support (Pt100 / Pt1000 / Resistance)

Compatible with virtually all standard industrial resistance temperature sensors, reducing inventory overhead and enabling easy integration with existing field instruments.

Flexible 2/3/4-Wire Connection Modes

Supports 2-wire, 3-wire, and 4-wire sensor wiring schemes. Using 3-wire or 4-wire wiring automatically compensates for lead wire resistance, maintaining accuracy across long cable runs.

Simple STEP 7-Micro/WIN SMART Configuration

Easily configure individual channel parameters, sensor curves, noise suppression frequencies (50 Hz / 60 Hz), and engineering units (Celsius/Fahrenheit) directly within STEP 7-Micro/WIN SMART.

Applications

• High-precision temperature control in food, beverage, and dairy processing

• HVAC plant monitoring, chiller management, and environmental chambers

• Pharmaceutical and chemical reactor temperature tracking

• Plastic extrusion, rubber processing, and industrial curing systems