Siemens 6ES7288-3AR02-0AA0 S7-200 SMART RTD Module

Siemens 6ES7288-3AR02-0AA0: SIMATIC S7-200 SMART EM AR02 RTD Temperature Module

The Siemens 6ES7288-3AR02-0AA0 (Expansion Module EM AR02) is a compact 2-channel resistance temperature detector (RTD) input module engineered for the SIMATIC S7-200 SMART PLC family. Designed for cost-effective, high-accuracy thermal sensing, this module enables direct connection of Pt100, Pt1000, Ni100, and other standard resistance temperature devices to monitor critical plant equipment.

Featuring 16-bit analog-to-digital resolution, flexible 2-wire, 3-wire, or 4-wire connection modes, and integrated signal filtering, the EM AR02 delivers reliable temperature monitoring in a compact form factor.

Key Technical Specifications

• Part Number: 6ES7288-3AR02-0AA0 (MLFB: 6ES7288-3AR02-0AA0)

• Product Series: SIMATIC S7-200 SMART

• Module Type: RTD Resistance Temperature Analog Input Module (EM AR02)

• Number of Inputs: 2 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 internal bus

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

Provides accurate temperature readings down to fine increments, giving controllers the precise data required for continuous process monitoring and tight loop control.

Ideal for 2-Channel Compact Applications

Eliminates the cost of paying for unused capacity when only one or two RTD sensors are needed on small machines, optimizing equipment costs.

Cable Length Compensation (3/4-Wire Modes)

Supports 2-wire, 3-wire, and 4-wire sensor wiring connections. Using 3-wire or 4-wire configurations automatically cancels out line resistance, preserving temperature measurement accuracy across long cable runs.

Convenient STEP 7-Micro/WIN SMART Integration

Quickly set up individual channel types, noise suppression rates (50 Hz / 60 Hz), filter constants, and measurement units (Celsius/Fahrenheit) within the STEP 7-Micro/WIN SMART programming environment.

Applications

• Temperature monitoring on small OEM machinery, pumps, and compressors

• HVAC air handling units, chillers, and environmental monitoring boxes

• Small-scale food processing equipment, pasteurizers, and fryers

• Bearing and motor winding temperature protection systems